SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  -------------

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                                  
                                -----------------


                                 EON LABS, INC.
     -----------------------------------------------------------------------

                                (Name of Issuer)

                     COMMON STOCK, PAR VALUE $0.01 PER SHARE
               
     -----------------------------------------------------------------------


                         (Title of Class of Securities)

                                    29412E100
                  

     -----------------------------------------------------------------------
                     (CUSIP Number of Class of Securities)

             George Miller                  Trevor S.Norwitz, Esq.
             Novartis AG                    Wachtell, Lipton, Rosen & Katz
             Lichtstrasse 35                51 West 52 Street
             CH-4002, Basel                 New York , New York 10019
             Switzerland                    (212) 403-1000
             41-61-324-1111
                                           

     -----------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
  Authorized to Receive Notices and Communications on Behalf of Filing Persons)


                                February 20, 2005
                                

    -----------------------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)


     If the filing  person has  previously  filed a statement on Schedule 13G to
     report the  acquisition  that is the subject of this  Schedule  13D, and is
     filing  this  schedule  because  of  ss.ss.240.13d-1(e),   240.13d-1(f)  or
     240.13d-1(g), check the following box. [ ]

     NOTE:  Schedules  filed in paper format shall include a signed original and
     five copies of the schedule,  including all exhibits.  See ss.240.13d-7 for
     other parties to whom copies are to be sent.


     *The  remainder  of this cover  page  shall be filled  out for a  reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter disclosures provided in a prior cover page.





     The  information  required on the remainder of this cover page shall not be
     deemed to be  "filed"  for the  purpose  of  Section  18 of the  Securities
     Exchange  Act of 1934 ("Act") or otherwise  subject to the  liabilities  of
     that section of the Act but shall be subject to all other provisions of the
     Act (however, see the Notes).


    -----------------------------------------------------------------------




                                       2



CUSIP No. 29412E100
--------------------------------------------------------------------------------

              1.    NAMES OF REPORTING PERSONS:
                    Novartis Corporation

                    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
                    13-1834433
                    ------------------------------------------------------------

               2.   CHECK  THE  APPROPRIATE  BOX IF A  MEMBER  OF A  GROUP  (SEE
                    INSTRUCTIONS):


                    (a) [ ]
                        --------------------------------------------------------


                    (b) [ ]
                        --------------------------------------------------------
 
              3.    SEC USE ONLY:
 
                    ------------------------------------------------------------
 
              4.    SOURCE OF FUNDS (SEE INSTRUCTIONS):
                    AF
                    ------------------------------------------------------------
 
              5.    CHECK  IF  DISCLOSURE  OF  LEGAL   PROCEEDINGS  IS  REQUIRED
                    PURSUANT TO ITEMS 2(D) OR 2(E)    [ ]
                    ------------------------------------------------------------
 
              6.    CITIZENSHIP OR PLACE OF ORGANIZATION
                    New York
                    ------------------------------------------------------------
 
Number of     7.    SOLE VOTING POWER
Shares              0
Beneficially        ------------------------------------------------------------
Owned by
Each              
Reporting         
Person With   8.    SHARED VOTING POWER
                    0
                    ------------------------------------------------------------


                                       3


              
              9.    SOLE DISPOSITIVE POWER
                    0
                    ------------------------------------------------------------
              
              
              10.   SHARED DISPOSITIVE POWER
                    60,000,000
                    ------------------------------------------------------------

              11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                    60,000,000 (1)
                    ------------------------------------------------------------
 
              12.   CHECK IF THE AGGREGATE  AMOUNT IN ROW (11) EXCLUDES  CERTAIN
                    SHARES (SEE INSTRUCTIONS)         [ ] 
                    ------------------------------------------------------------
 
              13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    67.5%
                    ------------------------------------------------------------
 
              14.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
                    CO
                    ------------------------------------------------------------





--------------------------- 
     (1) The Reporting  Persons may be deemed to have shared  dispositive  power
over the Santo  Shares  (as  defined  in Item 4)  pursuant  to the  Santo  Stock
Purchase Agreement (as defined in Item 4). The Reporting Persons hereby disclaim
beneficial ownership of any shares of Common Stock.

                                       
                                       4




CUSIP No.  29412E100
--------------------------------------------------------------------------------
 
--------------------------------------------------------------------------------
              1.    NAMES OF REPORTING PERSONS: 
                    Zodnas Acquisition Corp.

                    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
                    Not available
                    ------------------------------------------------------------
 
              2.    CHECK  THE  APPROPRIATE  BOX IF A  MEMBER  OF A  GROUP  (SEE
                    INSTRUCTIONS):
 

                    (a)  [ ]
                         -------------------------------------------------------

                    (b)  [ ]
                         -------------------------------------------------------
 
              3.    SEC USE ONLY:
                    ------------------------------------------------------------
  
              4.    SOURCE OF FUNDS (SEE INSTRUCTIONS):
                    AF
                    ------------------------------------------------------------
 
              5.    CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
                    PURSUANT TO ITEMS 2(D) OR 2(E)    [ ]
                    ------------------------------------------------------------
 
              6.    CITIZENSHIP OR PLACE OF ORGANIZATION
                    Delaware
                    ------------------------------------------------------------
 
Number of     7.    SOLE VOTING POWER
Shares              0
Beneficially        ------------------------------------------------------------
Owned by
Each          8.    SHARED VOTING POWER   
Reporting           0
Person With         ------------------------------------------------------------
                 
             
                                       5




              9.    SOLE DISPOSITIVE POWER
                    0
                    ------------------------------------------------------------
              
              10.   SHARED DISPOSITIVE POWER
                    60,000,000
                    ------------------------------------------------------------

              11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                    60,000,000 (2)
                    ------------------------------------------------------------
 
              12.   CHECK IF THE AGGREGATE  AMOUNT IN ROW (11) EXCLUDES  CERTAIN
                    Shares (See Instructions)         [ ]
                    ------------------------------------------------------------
 
              13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    67.5%
                    ------------------------------------------------------------
 
              14.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
                    CO
                    ------------------------------------------------------------





--------------------------- 
     (2) The Reporting  Persons may be deemed to have shared  dispositive  power
over the Santo  Shares  (as  defined  in Item 4)  pursuant  to the  Santo  Stock
Purchase Agreement (as defined in Item 4). The Reporting Persons hereby disclaim
beneficial ownership of any shares of Common Stock. 


                                       6




CUSIP No.  29412E100
--------------------------------------------------------------------------------
 
--------------------------------------------------------------------------------
              1.    NAMES OF REPORTING PERSONS:
                    Novartis AG

                    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
                    98-0363351
                    ------------------------------------------------------------
 
              2.    CHECK  THE  APPROPRIATE  BOX IF A  MEMBER  OF A  GROUP  (SEE
                    INSTRUCTIONS):
                   

                    (a)  [ ]
                         -------------------------------------------------------

                    (b)  [ ]
                         -------------------------------------------------------
 
              3.    SEC USE ONLY:
                    ------------------------------------------------------------
 
              4.    SOURCE OF FUNDS (SEE INSTRUCTIONS):
                    WC
                    ------------------------------------------------------------
 
              5.    CHECK  IF  DISCLOSURE  OF  LEGAL   PROCEEDINGS  IS  REQUIRED
                    PURSUANT TO ITEMS 2(D) OR 2(E)    [ ]
                    ------------------------------------------------------------
 
              6.    CITIZENSHIP OR PLACE OF ORGANIZATION
                    Switzerland
                    ------------------------------------------------------------
 
Number of     7.    Sole Voting Power
Shares              0
Beneficially
Owned by
Each              
Reporting     8.    Shared Voting Power   
Person With         0
                    ------------------------------------------------------------

                                       7


              
              9.    SOLE DISPOSITIVE POWER
                    0
                    ------------------------------------------------------------
              
              10.   SHARED DISPOSITIVE POWER
                    60,132,122
                    ------------------------------------------------------------

          11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                60,132,122(3)
                ------------------------------------------------------------
 
          12.   CHECK IF THE AGGREGATE  AMOUNT IN ROW (11) EXCLUDES  CERTAIN
                SHARES (SEE INSTRUCTIONS) [ ]          
                ------------------------------------------------------------
 
          13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                67.7%
                ----------------------------------------------------------------
 
          14.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
                CO
                ----------------------------------------------------------------





--------------------------- 
     (3) The Reporting  Persons may be deemed to have shared  dispositive  power
over the Santo  Shares  (as  defined  in Item 4)  pursuant  to the  Santo  Stock
Purchase  Agreement (as defined in Item 4) and Novartis AG may be deemed to have
shared  dispositive  power  over the Hexal  Owned  Shres (as  defined in Item 5)
pursuant to the Hexal  Agreement (as defined in Item 5). The  Reporting  Persons
hereby disclaim beneficial ownership of any shares of Common Stock.


                                       8




ITEM 1.  SECURITY AND ISSUER

     This Schedule 13D filed by Novartis AG ("Novartis"),  Novartis Corporation,
("Novartis Corp"), and Zodnas Acquisition Corp. ("Zodnas" and, together with
Novartis and Novartis Corp, the "Reporting Persons") relates to the Common
Stock, par value $0.01 per share (the "Common Stock"), of Eon Labs, Inc., a
Delaware corporation (the "Company"). The principal executive offices of the
Company are located at 1999 Marcus Avenue, Lake Success, NY 11042.


ITEM 2.  IDENTITY AND BACKGROUND

     (a),  (b),  (c) and (f).  The name,  business  address,  present  principal
occupation or employment and  citizenship of the executive  officers and members
of the  Board of  Directors  of each of the  Reporting  Persons  is set forth on
Schedule I hereto and is incorporated herein by reference.

     (d) and (e).  None of the Reporting  Persons nor, to the best  knowledge of
each of them, any of the persons listed on Schedule I hereto with respect to
each such Reporting Person during the last five years, (i) has been convicted in
a criminal proceeding (excluding traffic violations or similar misdemeanors) or
(ii) was a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction and as a result of such proceeding was or is subject to a
judgment, decree or final order enjoining future violations of, or prohibiting
or mandating activities subject to, federal or state securities laws or finding
any violation with respect to such laws.


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     The funds for the  transactions  described in Item 4 below will be obtained
from cash on hand.


ITEM 4.  PURPOSE OF TRANSACTION

     (a)  and  (b).  On  February  20,  2005,   Novartis  Corp,   Santo  Holding
(Deutschland) GmbH ("Santo") and for purposes of Section 12 thereof only,
Novartis, entered into an Agreement for Purchase and Sale of Stock (the "Santo
Stock Purchase Agreement") relating to the purchase by Novartis Corp (or its
designee) of 60,000,000 shares of Common Stock (the "Santo Shares") representing
approximately 67.5% of the outstanding shares of Common Stock. A copy of the
Santo Stock Purchase Agreement is attached as Exhibit 2.1 hereto and
incorporated by reference herein.

     Also on February  20,  2005,  Novartis  Corp,  Zodnas,  the Company and for
purposes of Section 10.12 only, Novartis, entered into an Agreement and Plan of
Merger (the "Merger Agreement"). The Merger Agreement provides for Zodnas to
commence a tender offer (the "Offer") for any and all shares of the Common Stock
at a price of $31.00 per share in cash (the "Offer Price"). However, although
the Offer is being made for any and all shares of Common Stock, Santo has agreed
to sell the Santo Shares to Novartis Corp (or its designee) pursuant to the
Santo Stock Purchase Agreement at a price per share that is less than the Offer
Price. Therefore, effectively the Offer will be made for all shares of Common
Stock, other than the Santo Shares (the "Public Shares"). The closing of the
Offer is conditioned, among other things, upon the contemporaneous or
immediately subsequent purchase of the Santo Shares under the Santo Stock
Purchase Agreement. The Merger Agreement further provides that if a majority of
the Public Shares are tendered into the Offer, Novartis Corp will cause a merger
of Zodnas with and into the Company, with the Company surviving, where all of
the remaining holders of Common Stock will receive $31.00 per share (the
"Merger"). In the event that less than a majority of the Public Shares are
tendered into the Offer, the Merger Agreement provides that the standstill
provisions in the Confidentiality Agreement, dated as of February 11, 2005 by
and between Novartis Corp and the Company (the "Confidentiality Agreement") will
be amended to provide that Novartis Corp and Zodnas will be permitted to make
acquisitions of shares of Common Stock that are voluntary to the holders of
Common Stock (such as by means of legally permissible open market purchases or
additional tender offers) and may consummate a merger or other business
combination with the Company prior to February 11, 2006, only if: (1) a majority
of the then-


                                       9



outstanding Public Shares approve such transaction; or (2) Novartis
Corp and its subsidiaries own 90% or more the total outstanding shares of
Company Stock, provided that the price per share of Common Stock paid in any
such transaction described in (2) above is at least equal to the Offer Price.

     Following  the  completion  of the  Offer,  Novartis  Corp and  Zodnas  are
required to use their reasonable best efforts to keep the Common Stock quoted
for trading on the NASDAQ National Market as long as the Company is registered
under the Securities Exchange Act of 1934, as amended and satisfies the NASDAQ
National Market's listing standards (other than standards entirely within the
Company's control).

     Further,  the  Merger  Agreement  provides  that from and after the date on
which Zodnas becomes obligated to accept for payment any and all shares of
Common Stock tendered into the Offer, Novartis Corp will be entitled to
designate each member of the Company's Board of Directors, and the Company will
be required to promptly take all actions necessary to cause Novartis Corp's
designees to be so elected. However, if Novartis and Zodnas have purchased in
the Offer a majority of the Public Shares, then until the effective time of the
Merger, Novartis Corp and Merger Sub will permit the members of the special
committee (the "Special Committee") of the Company's Board of Directors (or
their designees) to remain on the Company's Board of Directors.

     A copy of the  Merger  Agreement  is  attached  hereto as  Exhibit  2.2 and
incorporated by reference herein and a copy of the Confidentiality Agreement is
attached as Exhibit 2.3 hereto and incorporated by reference herein.

     The  summaries of each of the Santo Stock  Purchase  Agreement,  the Merger
Agreement and the Confidentiality Agreement are qualified in their entireties by
reference to the full text of the documents attached hereto as Exhibits 2.1, 2.2
and 2.3, respectively.

     A copy of the press release relating to the transactions described above is
attached as Exhibit 99.1 hereto and incorporated by reference herein.


ITEM 5.  INTEREST IN SECURITIES OF ISSUER

     (a) and  (b) On  February  16 and 17,  2005,  Novartis  (Deutschland)  GmbH
("Novartis Deutschland") and Novartis (as guarantor) entered into a Share and
Partnership Interest Sale and Transfer Agreement (the "Hexal Agreement"), with
Dr. Andreas Strungmann, Ms. Susan Strungmann, Ms. Nicole Strungmann, Mr. Florian
Strungmann, Dr. Thomas Strungmann, Ms. Cornelia Strungmann, Mr. Fabian
Strungmann, Ms. Janina Strungmann, Ms. Fiona Strungmann, Mr. Felix Strungmann,
Hexal Aktiengesellschaft and A+T Vermogensverwaltung GmbH, relating to the
acquisition of shares in A+T Vermogensverwaltung GmbH as well as partnership
interests in A+T Holding GmbH & Co. KG (the "Hexal Business"). In connection
with the purchase of the Hexal Business, Novartis Deutschland will acquire
132,122 shares of Common Stock currently held by the companies comprising the
Hexal Business (the "Hexal Owned Shares"), which represents approximately .1% of
the outstanding shares of Common Stock.

     Other than as described in this Item 5 and in Item 4 above,  as of the date
hereof, none of the Reporting Persons are the record holder of any shares of
Common Stock or have the right to acquire any Common Stock.

     Novartis  Corp may be deemed to have  shared  power to dispose or to direct
the disposition with respect to the Santo Shares and Novartis may be deemed to
have shared power to dispose or to direct the disposition with respect to the
Hexal Owned Shares. Novartis is the beneficial owner of all Common Stock
beneficially owned by Novartis Corp and Novartis Deutschland.

     The Reporting Persons hereby disclaim beneficial ownership of any shares of
Common Stock. To the best knowledge of each of the Reporting Persons, none of
the persons listed on Schedule I hereto with respect to such Reporting Person is
the beneficial owner of any shares of Common Stock.


                                       10



     (c) Neither the Reporting Persons nor, to the best knowledge of each of the
Reporting Persons, any of the persons listed on Schedule I with respect to each
such Reporting Person has engaged in any transaction in the Common Stock in the
past 60 days other than as described in Item 4 and Item 5 above.

     (d) Not applicable.

     (e) Not applicable.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
SECURITIES OF THE ISSUER 

     See Item 4 and Item 5 above.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.



------------- ------------------------------------------------------------------
2.1           Agreement for Purchase and Sale of Stock, by and among Novartis
              Corporation, Santo Holding (Deutschland) GmbH and for purposes of 
              Section 12 only, Novartis AG, dated as of February 20, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
2.2           Agreement and Plan of Merger, by and among Novartis Corporation, 
              Zodnas Acquisition Corp., Eon Labs, Inc. and for purposes of 
              Section 10.12 only, Novartis AG, dated as of February 20, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
2.3           Confidentiality Agreement, by and between Novartis Corporation and
              Eon Labs, Inc., dated as of February 11, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
99.1          Press Release, dated February 21, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
99.2          Joint Filing Agreement, by and among Novartis AG, Novartis 
              Corporation and Zodnas Acquisition Corp., dated as of March 2, 
              2005

------------- ------------------------------------------------------------------



                                       11





                                  SIGNATURES


     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct. Dated: March 2, 2005
                                                      
                                                      
                                  NOVARTIS AG
                                                      
                                                      
                                   By:   /s/ Reto Brandli     
                                      ------------------------------------------
                                      Name:  Reto Brandli  
                                      Title: Head Group BP&A

                                   By:   /s/ Joerg Walther                      
                                      ------------------------------------------
                                      Name:  Joerg Walther
                                      Title: Authorized Signatory
                                                      
                                  NOVARTIS CORP
                                                      
                                                      
                                   By:   /s/ Martin Henrich                     
                                      ------------------------------------------
                                      Name:  Martin Henrich
                                      Title: Executive Vice President
                                                      
                                                      
                                  ZODNAS ACQUISITION CORP
                                                      
                                                      
                                   By:   /s/ Urs A. Naegelin                    
                                      ------------------------------------------
                                      Name:  Urs A. Naegelin
                                      Title: Director


                                                                    


                                       12



                                  Exhibit Index



------------- ------------------------------------------------------------------
2.1           Agreement for Purchase and Sale of Stock, by and among Novartis
              Corporation, Santo Holding (Deutschland) GmbH and for purposes of 
              Section 12 only, Novartis AG, dated as of February 20, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
2.2           Agreement and Plan of Merger, by and among Novartis Corporation, 
              Zodnas Acquisition Corp., Eon Labs, Inc. and for purposes of 
              Section 10.12 only, Novartis AG, dated as of February 20, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
2.3           Confidentiality Agreement, by and between Novartis Corporation and
              Eon Labs, Inc., dated as of February 11, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
99.1          Press Release, dated February 21, 2005

------------- ------------------------------------------------------------------
------------- ------------------------------------------------------------------
99.2          Joint Filing Agreement, by and among Novartis AG, Novartis 
              Corporation and Zodnas Acquisition Corp., dated as of March 2, 
              2005

------------- ------------------------------------------------------------------


                                       13






                       DIRECTORS AND EXECUTIVE OFFICERS OF
                       NOVARTIS, NOVARTIS CORP AND ZODNAS

DIRECTORS AND EXECUTIVE OFFICERS OF NOVARTIS

     The  name,  address,   citizenship  and  present  principal  occupation  or
employment of each of the  directors and executive  officers of Novartis are set
forth  below.  Unless  otherwise  indicated  below,  each  occupation  set forth
opposite an individual's name refers to employment with Novartis.


NAME, FUNCTION AND BUSINESS ADDRESS  CITIZENSHIP        PRINCIPAL OCCUPATION
Daniel Vasella                       Switzerland      Chairman of the Board of 
Chairman of the Board of Directors,                   Directors, Chief Executive
Chief Executive Officer                               Officer
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Hans-Jorg Rudloff                    Germany          Chairman of the Executive 
Vice Chairman of the Board of                         Committee of Barclays
Directors                                             Capital
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Prof. Dr. Helmut Sihler              Austria          Retired
Vice Chairman of the Board of
Directors
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Birgit Breuel                        Germany          Member of the Supervisory 
Director                                              Board of Gruner + Jahr AG,
c/o Novartis AG                                       German
Lichtstrasse 35
CH-4002 Basel, Switzerland

Prof. Dr. Peter Burckhardt           Switzerland      Head of Medical Service at
Director                                              the University Hospital of
c/o Novartis AG                                       Lausanne
Lichtstrasse 35
CH-4002 Basel, Switzerland

Prof. Srikant Datar, PhD.            India            Senior Associate Dean for 
Director                                              Executive Education at 
c/o Novartis AG                                       Harvard Business School
Lichtstrasse 35
CH-4002 Basel, Switzerland

William W. George                    USA              Chairman and Chief 
Director                                              Executive Officer of 
c/o Novartis AG                                       Medtronic, Inc., 
Lichtstrasse 35                                       Minneapolis
CH-4002 Basel, Switzerland 

Alexandre F. Jetzer                  Switzerland      Consultant
Director
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Pierre Landoldt                      Switzerland      President of the Sandoz 
Director                                              Family Foundation
c/o Novartis AG
Lichtstrasse 35                                                     




                                       14



CH-4002 Basel, Switzerland

Prof. Dr. Rolf M. Zinkernagel        Switzerland      Professor and Director of 
Director                                              the Institute of 
c/o Novartis AG                                       Experimental Immunology at
Lichtstrasse 35                                       the University of Zurich
CH-4002 Basel,
Switzerland                                                     
                           
Prof. Ulrich Lehner, PhD             Germany          President and Chief 
Director                                              Executive Officer of 
c/o Novartis AG                                       Henkel KGaA
Lichtstrasse 35
CH-4002 Basel, Switzerland

Dr.-Ing. Wendelin Wiedeking          Germany          Chairman of Porsche AG 
c/o Novartis AG                                       Director 
Lichtstrasse 35
CH-4002 Basel, Switzerland

Dr. Raymund Breu                     Switzerland      Chief Financial Officer
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Dr. Urs Barlocher                    Switzerland      Head of Legal and General 
c/o Novartis AG                                       Affairs
Lichtstrasse 35
CH-4002 Basel, Switzerland

Jurgen Brokatzky-Geiger              Germany          Head of Human Resources
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Dr. Paul Choffat                     Switzerland      Head of Novartis Consumer 
c/o Novartis AG                                       Health 
Lichtstrasse 35
CH-4002 Basel, Switzerland

Thomas Ebeling                       Germany          Head of Pharmaceuticals
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland

Mark C. Fishman                      USA              Head of Biomedical 
c/o Novartis AG                                       Research
Lichtstrasse 35
CH-4002 Basel, Switzerland

Steven Kelmar                        USA              Head of Public Affairs 
c/o Novartis AG                                       and Communications
Lichtstrasse 35
CH-4002 Basel, Switzerland



                                       15



DIRECTORS AND EXECUTIVE OFFICERS OF NOVARTIS CORP

     The  name,  address,   citizenship  and  present  principal  occupation  or
employment of each of the directors and executive  officers of Novartis Corp are
set forth below.  Unless otherwise  indicated  below,  each occupation set forth
opposite an individual's name refers to employment with Novartis Corp.


NAME, FUNCTION AND BUSINESS ADDRESS  CITIZENSHIP        PRINCIPAL OCCUPATION
Daniel Vasella                       Switzerland      Chairman of the Board of 
Chairman of the Board of Directors                    Directors and Chief 
c/o Novartis AG                                       Executive Officer of 
Lichtstrasse 35                                       Novartis
CH-4002 Basel, Switzerland  

Terence Barnett                      Great Britain    Vice Chairman, President 
Vice Chairman of the Board of                         and Chief Executive 
Directors                                             Officer
c/o Novartis Corporation
608 Fifth Avenue
New York, NY 10020,
USA

Dr. Raymund Breu                     Switzerland      Chief Financial Officer of
Director                                              Novartis 
c/o Novartis AG 
Lichtstrasse 35
CH-4002 Basel, Switzerland

Thomas Ebeling                       Germany          Head of Novartis Pharma
Director
c/o Novartis AG
Lichtstrasse 35
CH-4002 Basel, Switzerland


Fred Meyer                           Switzerland      Retired
Director
c/o Omnicom Group, Inc.
437 Madison Avenue
New York, NY 10022, USA

Urs Naegelin                         Switzerland      Executive Vice President 
c/o Novartis Corporation                              and Chief Financial 
608 Fifth Avenue                                      Officer
New York, NY 10020, USA

Dr. Paul Choffat                     Switzerland      Division Head Consumer 
c/o Novartis AG                                       Health
Lichtstrasse 35
CH-4002 Basel, Switzerland

Dr. Martin Henrich                   Switzerland      Executive Vice President, 
c/o Novartis Corporation                              Regional General Counsel 
608 Fifth Avenue                                      and Secretary of Novartis
New York, NY 10020, USA                               Corp



                                       16



DIRECTORS AND EXECUTIVE OFFICERS OF ZODNAS

     The  name,  address,   citizenship  and  present  principal  occupation  or
employment of each of the  directors  and  executive  officers of Zodnas are set
forth  below.  Unless  otherwise  indicated  below,  each  occupation  set forth
opposite an individual's name refers to employment with Zodnas.


NAME, FUNCTION AND BUSINESS ADDRESS  CITIZENSHIP      PRINCIPAL OCCUPATION
Terence Barnett                      Great            Vice Chairman, President 
Chairman of the Board of Directors   Britain          and Chief Executive 
c/o Novartis Corporation                              Officer of Novartis Corp
608 Fifth Avenue
New York, NY 10020, USA

Urs Naegelin                         Switzerland      Executive Vice President
Director, Vice President                              and Chief Financial 
c/o Novartis Corporation                              Officer of Novartis Corp
608 Fifth Avenue
New York, NY 10020, USA

Martin Henrich                       Switzerland      Executive Vice President 
Director, Vice President and                          and Regional General 
Assistant Secretary                                   Counsel of Novartis Corp
c/o Novartis Corporation
608 Fifth Avenue
New York, NY 10020, USA

John Sedor                           USA              President and Chief 
President                                             Executive Officer of 
c/o Sandoz Inc.                                       Sandoz Inc.
506 Carnegie Center, Suite 400
Princeton, NJ 08540, USA

Eric W. Evans                        USA              Vice President and Chief 
Vice President and Chief Financial                    Financial Officer of 
Officer                                               Sandoz Inc.
c/o Sandoz Inc.
506 Carnegie Center, Suite 400
Princeton, NJ 08540, USA

Eric Pomerantz                       USA              Vice President and General
Vice President and Secretary                          Counsel of Sandoz Inc.
c/o Sandoz Inc.
506 Carnegie Center, Suite 400
Princeton, NJ 08540, USA

Wayne P. Merkelson                   USA              Vice President and 
Vice President and Assistant                          Associate General Counsel 
Secretary                                             of Novartis Corp
c/o Novartis Corporation
608 Fifth Avenue
New York, NY 10020, USA




                                       17