SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
________________
SCHEDULE 13G
(Rule 13d-102)
________________
INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c)
AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No.2)*
DUSA PHARMACEUTICALS INC
(Name of Issuer)
Common Stock, $.01 par value
(Title of Class of Securities)
266898105
(CUSIP Number)
December 31, 2001
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[ ] Rule 13d-1(b)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)
___________
* 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 the disclosures provided in a prior cover page.
The information required in 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).
Schedule 13G/A PAGE 2 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
CLSP, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
977,400
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
977,400
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
977,400
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
7.1%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
PN
_____________________________________________________________________________
Schedule 13G/A PAGE 3 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
CLSP II, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
306,400
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
306,400
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
306,400
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.2%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
PN
_____________________________________________________________________________
Schedule 13G/A PAGE 4 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
CLSP/SBS I, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
337,900
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
337,900
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
337,900
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.4%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
PN
_____________________________________________________________________________
Schedule 13G/A PAGE 5 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
CLSP/SBS II, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
170,900
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
170,900
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
170,900
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
1.2%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
PN
_____________________________________________________________________________
Schedule 13G/A PAGE 6 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Cooper Hill Partners, L.P.
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
374,700
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
374,700
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
374,700
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.7%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
PN
_____________________________________________________________________________
Schedule 13G/A PAGE 7 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Cooper Hill Partners, LLC
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
1,792,600
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
1,792,600
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
1,792,600
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
12.9%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
OO
_____________________________________________________________________________
Schedule 13G/A PAGE 8 OF 14
CUSIP No. 266898105
_____________________________________________________________________________
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Jeffrey Casdin
_____________________________________________________________________________
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [x]
(b) [ ]
_____________________________________________________________________________
(3) SEC USE ONLY
_____________________________________________________________________________
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
_____________________________________________________________________________
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ______________________________________________________________
BENEFICIALLY (6) SHARED VOTING POWER
2,167,300
OWNED BY ______________________________________________________________
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ______________________________________________________________
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,167,300
_____________________________________________________________________________
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,167,300
_____________________________________________________________________________
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
_____________________________________________________________________________
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
15.7%
_____________________________________________________________________________
(12) TYPE OF REPORTING PERSON
IN
_____________________________________________________________________________
Schedule 13G/A PAGE 9 OF 14
ITEM 1(a). NAME OF ISSUER:
DUSA PHARMACEUTICALS INC
ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
25 Upton Drive, Wilmington, MA 01887
ITEM 2(a). NAME OF PERSON FILING:
This statement is filed by:
(i) CLSP, L.P. ("CLSP"),
a Delaware limited partnership, with respect to the Securities
owned by it;
(ii) CLSP II, L.P. ("CLSP II") a Delaware limited
partnership, with respect to the Securities owned by it;
(iii) CLSP/SBS I, L.P. ("CLSP/SBS I") a Delaware
limited partnership, with respect to the Securities
owned by it;
(iv) CLSP/SBS II, L.P. ("CLSP/SBS II") a Delaware
limited partnership, with respect to the Securities
owned by it;
(v) Cooper Hill Partners, LLC ("Cooper, LLC "), a Delaware
limited liability company and the sole general partner of
CLSP, CLSP II, CLSP/SBS I AND CLSP/SBS II with respect to the
Securities owned by CLSP, CLSP II, CLSP/SBS I AND CLSP/SBS II;
(vi) Cooper Hill Partners, L.P., a Delaware limited partnership
with respect to the Securities held for CLSP Overseas, Ltd.
("CLSP Overseas"), [a Cayman Islands exempted company]; and
(vii) Jeffrey Casdin a citizen of the United States, and the
Managing Member of Casdin Capital, LLC, the general partner of
Cooper Hill Partners, L.P. and the managing member of Cooper
LLC, with respect to Securities subject to the
control of Cooper LLC and Cooper Hill Partners, LP.
The foregoing persons (other than CLSP Overseas) are hereinafter
sometimes collectively referred to as the "Reporting Persons."
Any disclosures herein with respect to persons other than the
Reporting Persons are made on information and belief after making
inquiry to the appropriate party.
Schedule 13G/A PAGE 10 OF 14
ITEM 2(b). ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE:
The business address of each of the Reporting Persons is 230 Park
Avenue, New York, New York 10169. The business address of CLSP Overseas is c/o
Goldman Sachs (Cayman) Trust, Limited P.O. Box 896 G.T. Harbour Centre, Second
Floor, North Church Street, George Town, Grand Cayman, Cayman Islands, B.W.I.
ITEM 2(c). CITIZENSHIP:
Cooper LLC is a Delaware limited liability company and CLSP,
CLSP II, CLSP/SBS I, CLSP/SBS II and Cooper Hill Partners, L.P. are each a
Delaware limited partnership. CLSP Overseas is a Cayman Islands exempted
company. Jeffrey Casdin is a citizen of the United States.
ITEM 2(d). TITLE OF CLASS OF SECURITIES: Common Stock, $.01 par value
ITEM 2(e). CUSIP NUMBER: 266898105
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c),
CHECK WHETHER THE PERSON FILING IS A:
(a) [ ] Broker or dealer registered under Section 15 of the
Act
(b) [ ] Bank as defined in Section 3(a)(6) of the Act
(c) [ ] Insurance Company as defined in Section 3(a)(19) of
the Act
(d) [ ] Investment Company registered under Section 8 of the
Investment Company Act of 1940
(e) [ ] Investment Adviser registered under Section 203 of the
Investment Advisers Act of 1940: see Rule 13d-
1(b)(1)(ii)(E)
(f) [ ] Employee Benefit Plan, Pension Fund which is subject
to the provisions of the Employee Retirement Income
Security Act of 1974 or Endowment Fund; see Rule 13d-
1(b)(1)(ii)(F)
(g) [ ] Parent Holding Company, in accordance with Rule 13d-
1(b)(ii)(G);
(h) [ ] Savings Associations as defined in Section 3(b) of the
Federal Deposit Insurance Act;
(i) [ ] Church Plan that is excluded from the definition of an
investment company under Section 3(c)(14) of the
Investment Company Act of 1940;
Schedule 13G/A PAGE 11 OF 14
(j) ( ) Group, in accordance with Rule 13d-1(b)(1)(ii)(J).
IF THIS STATEMENT IS FILED PURSUANT TO Rule 13d-1(c), CHECK THIS BOX. [x]
ITEM 4. OWNERSHIP.
A. CLSP
(a) Amount beneficially owned: 977,400
(b) Percent of class: 7.1%
(All percentages herein are based on 13,768,640 shares of Common
Stock reported to be outstanding as of May 11, 2001, as
reflected in the Company's quarterly report on Form 10-Q filed
with the Securities and Exchange Commission by the Company for
the quarter ended March 31, 2001.)
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
977,400
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 977,400
B. CLSP II
(a) Amount beneficially owned: 306,400
(b) Percent of class: 2.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
306,400
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 306,400
C. CLSP/SBS I
(a) Amount beneficially owned: 337,900
(b) Percent of class: 2.4%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
337,900
(iii) sole power to dispose or to direct the disposition
of 0
Schedule 13G/A PAGE 12 OF 14
(iv) shared power to dispose or to direct the disposition
of 337,900
D. CLSP/SBS II
(a) Amount beneficially owned: 170,900
(b) Percent of class: 1.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
170,900
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 170,900
E. Cooper Hill Partners, L.P.
(a) Amount beneficially owned: 374,700
(b) Percent of class: 2.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
374,700
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 374,700
F. Cooper LLC
(a) Amount beneficially owned: 1,792,600
(b) Percent of class: 12.9%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
1,792,600
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 1,792,600
Schedule 13G/A PAGE 13 OF 14
G. Jeffrey Casdin
(a) Amount beneficially owned: 2,167,300
(b) Percent of class: 15.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
2,167,300
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 2,167,300
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
Not applicable.
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
CLSP, CLSP II, CLSP/SBS I, and CLSP/SBS II are each private investment
partnerships, the sole general partner of which is Cooper, LLC. As the sole
general partner of CLSP, CLSP II, CLSP/SBS I, and CLSP/SBS II, Cooper, LLC has
the power to vote and dispose of the Securities owned by each of CLSP, CLSP II,
CLSP/SBS I, and CLSP/SBS II and, accordingly, may be deemed the "beneficial
owner" of such Securities. The managing member of Cooper, LLC is Jeffrey Casdin.
Pursuant to an investment advisory contract, Cooper Hill Partners, L.P.
currently has the power to vote and dispose of the Securities held for the
account of CLSP Overseas, Ltd. and, accordingly, may be deemed the "beneficial
owner" of such Securities. Mr. Casdin is the managing member of Casdin Capital,
LLC, the general partner of Cooper Hill Partners, L.P.
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
Not applicable.
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
See Item 6.
ITEM 9. NOTICE OF DISSOLUTION OF GROUP.
Not applicable.
Schedule 13G/A PAGE 14 OF 14
ITEM 10. CERTIFICATION. (if filing pursuant to Rule 13d-1(c))
Each of the Reporting Persons and CLSP Overseas, Ltd. hereby make
the following certification:
By signing below each Reporting Person certifies that, to the best
of its knowledge and belief, the securities referred to above were not acquired
and are not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the Securities and were not acquired
and not held in connection with or as a participant in any transaction having
that purpose or effect.
SIGNATURES
After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.
DATED: February 14, 2002 /s/Jeffrey Casdin
---------------------------------
JEFFREY CASDIN, individually,and
as managing member of Cooper Hill
Partners, LLC, and on behalf of CLSP,
L.P., CLSP II, L.P., CLSP/SBS I, L.P.,
and CLSP/SBS II, L.P. and as managing
member of Casdin Capital, L.L.C., the
general partner of Cooper Hill Partners,
L.P.