ARQULE INC
SC 13G, 2000-09-22
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934

                                  ArQule, Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    04269E107
                                 (CUSIP Number)

                                 August 22, 2000

             (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).

<PAGE>

CUSIP No. 04269E107

       1.    Names of Reporting Persons.
             I.R.S. Identification Nos. of above persons (entities only).

             OrbiMed Advisers Inc.

       2.    Check the Appropriate Box if a Member Of a Group (See Instructions)

             [ ] (a)
             [ ] (b)

       3.    SEC Use Only

       4.    Citizenship or Place of Organization

             British Virgin Islands

                 5.  Sole Voting Power  0
Number of
Shares           6.  Shared Voting Power  759,300
Beneficially
Owned by         7.  Sole Dispositive Power  0
Each Reporting
Person With      8.  Shared Dispositive Power  759,300

<PAGE>

       9.    Aggregate Amount Beneficially Owned by Each Reporting Person
             759,300

       10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)

       11.   Percent of Class Represented by Amount in Row (9) 5.60%

       12.   Type of Reporting Person (See Instructions) IA

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

CUSIP No. 04269E107

       1.    Names of Reporting Persons.
             I.R.S. Identification Nos. of above persons (entities only).

             OrbiMed Advisors LLC

       2.    Check the Appropriate Box if a Member of a Group (See Instructions)

             [ ] (a)
             [ ] (b)

       3.    SEC Use Only

       4.    Citizenship or Place of Organization

             Delaware

<PAGE>

               5.    Sole Voting Power  0
Number of
Shares         6.    Shared Voting Power  759,300
Beneficially
Owned by       7.    Sole Dispositive Power  0
Each Reporting
Person With    8.    Shared Dispositive Power  759,300

       9.    Aggregate Amount Beneficially Owned by Each Reporting Person
             759,300

       10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)

       11.   Percent of Class Represented by Amount in Row (9) 5.60%

       12.   Type of Reporting Person (See Instructions) CO

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

CUSIP No. 04269E107

       1.    Names of Reporting Persons.
             I.R.S. Identification Nos. of above persons (entities only).

             Caduceus Capital Trust

<PAGE>

       2.    Check the Appropriate Box if a Member of a Group (See Instructions)

             [ ] (a)
             [ ] (b)

       3.    SEC Use Only

       4.    Citizenship or Place of Organization

             Bermuda

                  5.    Sole Voting Power  0
Number of
Shares            6.    Shared Voting Power  759,300
Beneficially
Owned by          7.    Sole Dispositive Power  0
Each Reporting
Person With       8.    Shared Dispositive Power  759,300

       9.    Aggregate Amount Beneficially Owned by Each Reporting Person
             759,300

       10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)

       11.   Percent of Class Represented by Amount in Row (9) 5.60%

<PAGE>

       12.   Type of Reporting Person (See Instructions) OO

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

CUSIP No. 04269E107

       1.    Names of Reporting Persons.
             I.R.S. Identification Nos. of above persons (entities only).

             Caduceus Capital II, L.P.

       2.    Check the Appropriate Box if a Member of a Group (See Instructions)

             [ ] (a)
             [ ] (b)

       3.    SEC Use Only

       4.   Citizenship or Place of Organization

             Delaware

                 5.   Sole Voting Power  0
Number of
Shares           6.   Shared Voting Power  759,300
Beneficially
Owned by         7.   Sole Dispositive Power  0
Each Reporting
Person With      8.   Shared Dispositive Power  759,300

<PAGE>

       9.    Aggregate Amount Beneficially Owned by Each Reporting Person
             759,300

       10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)

       11.   Percent of Class Represented by Amount in Row (9) 5.60%

       12.   Type of Reporting Person (See Instructions) PN

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

CUSIP No. 04269E107

       1.    Names of Reporting Persons.
             I.R.S. Identification Nos. of above persons (entities only).

             PaineWebber Eucalyptus Fund, LLC

       2.    Check the Appropriate Box if a Member of a Group (See Instructions)

             [ ] (a)
             [ ] (b)

<PAGE>

       3.    SEC Use Only

       4.    Citizenship or Place of Organization

             Delaware

                  5.   Sole Voting Power  0
Number of
Shares            6.   Shared Voting Power  759,300
Beneficially
Owned by          7.   Sole Dispositive Power  0
Each Reporting
Person With       8.   Shared Dispositive Power  759,300

       9.    Aggregate Amount Beneficially Owned by Each Reporting Person
             759,300

<PAGE>

       10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)

       11.   Percent of Class Represented by Amount in Row (9) 5.60%

       12.   Type of Reporting Person (See Instructions) IV

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

CUSIP No. 04269E107

<PAGE>

       1.    Names of Reporting Persons.
             I.R.S. Identification Nos. of above persons (entities only).

             PaineWebber Eucalyptus Fund, Ltd.

       2.    Check the Appropriate Box if a Member of a Group (See Instructions)

             [ ] (a)
             [ ] (b)

       3.    SEC Use Only

       4.    Citizenship or Place of Organization

             Cayman Islands

                  5.    Sole Voting Power  0
Number of
Shares            6.    Shared Voting Power  759,300
Beneficially
Owned by          7.    Sole Dispositive Power  0
Each Reporting
Person With       8.    Shared Dispositive Power  759,300

       9.    Aggregate Amount Beneficially Owned by Each Reporting Person
             759,300

<PAGE>

       10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)

       11.   Percent of Class Represented by Amount in Row (9) 5.60%

       12.   Type of Reporting Person (See Instructions) IV

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

Item 1. (a)  Issuer: ArQule, Inc.

        (b)  Address: 200 Boston Ave.
             Medford, MA  02155

Item 2. (a)  Name of Person Filing:
             OrbiMed Advisers Inc.
             OrbiMed Advisors LLC
             Caduceus Capital Trust
             Caduceus Capital II, L.P.
             PaineWebber Eucalyptus Fund, LLC
             PaineWebber Eucalyptus Fund, Ltd.

        (b)  Address of Principal Business Offices:

<PAGE>

             c/o OrbiMed Advisors LLC
             767 Third Avenue, 6th Floor
             New York, New York 10010

        (c)  Citizenship:
             Please refer to Item 4 on each cover sheet for each filing person

        (d)  Title of Class of Securities
             Common stock

        (e)  CUSIP Number: 04269E107

Item 3.  Not Applicable

Item 4.  Ownership

         Please  see Items 5 - 9 and 11 for each  cover  sheet for each
         filing separately

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.

         Not Applicable


Item 7.  Identification  and  Classification  of the  Subsidiary  Which
         Acquired the Security  Being Reported on By the Parent Holding
         Company

<PAGE>

         Not Applicable


Item 8.  Identification and Classification of Members of the Group

         Not Applicable


Item 9.  Notice of Dissolution of Group

         Not Applicable


Item 10. Certification

         By  signing  below I  certify  that,  to the best of my  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
         are not held in connection  with or as a participant in any transaction
         having that purpose or effect.



<PAGE>

                                    SIGNATURE

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.

Date: September 21, 2000
                                           OrbiMed Advisers Inc.

                                                  By: /s/ Samuel D. Isaly
                                                  ----------------------------
                                                  Name:  Samuel D. Isaly
                                                  Title: President

                                           OrbiMed Advisors LLC

                                                  By: /s/ Samuel D. Isaly
                                                  ----------------------------
                                                  Name:  Samuel D. Isaly
                                                  Title: Managing Member

                                           Caduceus Capital Trust

                                                  By: /s/ Samuel D. Isaly
                                                  ----------------------------
                                                  Name:  Samuel D. Isaly
                                                  Title: Portfolio Manager

                                           Caduceus Captital II, L.P.

                                                  By: /s/ Samuel D. Isaly
                                                  ----------------------------
                                                  Name:  Samuel D. Isaly
                                                  Title: Portfolio Manager

                                           PaineWebber Eucalyptus Fund, LLC

                                                  By: /s/ Samuel D. Isaly
                                                  ----------------------------
                                                  Name:  Samuel D. Isaly
                                                  Title: Portfolio Manager

                                           PaineWebber Eucalyptus Fund, Ltd.

                                                  By: /s/ Samuel D. Isaly
                                                  ----------------------------
                                                  Name:  Samuel D. Isaly
                                                  Title: Portfolio Manager



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