DIATIDE INC
SC 13G, 1997-02-14
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13G
                                 (Rule 13d-102)

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934



                                  Diatide, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)



                     Common Stock, $.001 par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)



                                   252842 10 9
                          ----------------------------
                                 (CUSIP Number)




<PAGE>   2


- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  2  of  9
             -----------                                       ---    ---
- ---------------------------                         ---------------------------


                                  SCHEDULE 13G

- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         Medical Science Partners, L.P.
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP - 

         Not Applicable
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


- --------------------------------------------------------------------------------
4.       CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- --------------------------------------------------------------------------------
                          5.       SOLE VOTING POWER                           
                                                                               
                                   0 Shares                                    
        NUMBER OF         ------------------------------------------------------
         SHARES           6.       SHARED VOTING POWER                          
      BENEFICIALLY                                                              
         OWNED BY                  936,311 Shares                               
          EACH            ------------------------------------------------------
       REPORTING          7.       SOLE DISPOSITIVE POWER                       
         PERSON                                                                 
          WITH:                    0 Shares                                     
                          ------------------------------------------------------
                          8.       SHARED DISPOSITIVE POWER                     
                                                                                
                                   936,311 Shares                               
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         936,311 Shares
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES.

         Not Applicable
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         9.2%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON.

         PN
- --------------------------------------------------------------------------------



<PAGE>   3



- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  3  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------



- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         Medical Science Ventures, L.P.
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP  

         Not Applicable
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


- --------------------------------------------------------------------------------
4.       CITIZENSHIP OR PLACE OF ORGANIZATION

         Delaware
- --------------------------------------------------------------------------------
                            5.       SOLE VOTING POWER                          
                                                                                
                                     0 Shares                                   
         NUMBER OF          ----------------------------------------------------
          SHARES            6.       SHARED VOTING POWER                        
       BENEFICIALLY                                                             
         OWNED BY                    936,311 Shares                             
          EACH              ----------------------------------------------------
        REPORTING           7.       SOLE DISPOSITIVE POWER                     
         PERSON                                                                 
          WITH:                      0 Shares                                   
                            ----------------------------------------------------
                            8.       SHARED DISPOSITIVE POWER                   
                                                                                
                                     936,311 Shares                             
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         936,311 Shares
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES.

         Not Applicable
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         9.2%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON.

         PN
- --------------------------------------------------------------------------------





<PAGE>   4



- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  4  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------



- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         Andre L. Lamotte
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP  

         Not Applicable
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


- --------------------------------------------------------------------------------
4.       CITIZENSHIP OR PLACE OF ORGANIZATION

         United States of America
- --------------------------------------------------------------------------------
                           5.       SOLE VOTING POWER                           
                                                                                
                                    8,840 Shares                                
         NUMBER OF         -----------------------------------------------------
          SHARES           6.       SHARED VOTING POWER                         
       BENEFICIALLY                                                             
         OWNED BY                   1,028,830 Shares                            
          EACH             -----------------------------------------------------
        REPORTING          7.       SOLE DISPOSITIVE POWER                      
         PERSON                                                                 
          WITH:                     8,840 Shares                                
                           -----------------------------------------------------
                           8.       SHARED DISPOSITIVE POWER                    
                                                                                
                                    1,028,830 Shares                            
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         1,037,670 Shares (Includes 919,089 Shares held by Medical Science
         Partners, L.P., the sole general partner of which is Medical Science
         Ventures, L.P., of which Mr. Lamotte is a general partner. Also
         includes 96,154 Shares held by Medical Science Partners II, L.P. and
         13,587 Shares held by Medical Science II Co-Investment L.P., the sole
         general partner of each of which is Medical Science Ventures II, L.P.,
         of which Mr. Lamotte is a general partner.)
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES.

                                                                         [ ]
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         10.2%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON.

         IN
- --------------------------------------------------------------------------------




<PAGE>   5




- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  5  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------




- --------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSONS

         Joseph F. Lovett
- --------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP  

         Not Applicable
- --------------------------------------------------------------------------------
3.       SEC USE ONLY


- --------------------------------------------------------------------------------
4.       CITIZENSHIP OR PLACE OF ORGANIZATION

         United States of America
- --------------------------------------------------------------------------------
                            5.       Sole Voting Power                          
                                                                                
                                     13,382 Shares                              
          NUMBER OF         ----------------------------------------------------
           SHARES           6.       Shared Voting Power                        
        BENEFICIALLY                                                            
          OWNED BY                   1,028,830 Shares                           
           EACH             ----------------------------------------------------
         REPORTING          7.       Sole Dispositive Power                     
          PERSON                                                                
           WITH:                     13,382 Shares                              
                            ----------------------------------------------------
                            8.       Shared Dispositive Power                   
                                                                                
                                     1,028,830 Shares                           
- --------------------------------------------------------------------------------
9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.

         1,042,212 Shares (Includes 919,089 Shares held by Medical Science
         Partners, L.P., the sole general partner of which is Medical Science
         Ventures, L.P., of which Mr. Lovett is a general partner. Also
         includes 96,154 Shares held by Medical Science Partners II, L.P. and
         13,587 Shares held by Medical Science II Co-Investment L.P., the sole
         general partner of each of which is Medical Science Ventures II, L.P.,
         of which Mr. Lovett is a general partner.)
- --------------------------------------------------------------------------------
10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES.

                                                                        [ ]
- --------------------------------------------------------------------------------
11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.

         10.2%
- --------------------------------------------------------------------------------
12.      TYPE OF REPORTING PERSON.

         IN
- --------------------------------------------------------------------------------




<PAGE>   6



- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  6  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------

                                  SCHEDULE 13G


Item 1(a).  Name of Issuer:
            ---------------

            Diatide, Inc.


Item 1(b).  Address of Issuer's Principal Executive Offices:
            ------------------------------------------------

            Nine Delta Drive
            Londonderry, New Hampshire 03053


Item 2(a).  Name of Person Filing:
            ----------------------

            Andre L. Lamotte for himself and on behalf of:

            Medical Science Partners, L.P.
            Medical Science Ventures, L.P.
            Joseph F. Lovett


Item 2(b).  Address of Principal Business Office or, if None, Residence:
            ------------------------------------------------------------

            For each reporting person the business address is:

            c/o Medical Science Partners, L.P.
            20 William Street
            Suite 250
            Wellesley, MA 02181


Item 2(c).  Citizenship:
            ------------

            Each of Medical Science Partners, L.P. and Medical Science Ventures,
            L.P. is organized under the laws of the State of Delaware.

            Each of Andre L. Lamotte and Joseph F. Lovett is a citizen of the
            United States of America.



<PAGE>   7




- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  7  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------




Item 2(d).  Title of Class of Securities:
            -----------------------------

            Common Stock, $.001 par value per share


Item 2(e).  CUSIP Number:
            -------------

            252842 10 9


Item 3:

            Not Applicable


Item 4.     Ownership:

            (a) Amount Beneficially Owned:

            Medical Science Partners, L.P. holds 919,089 Shares. The sole
            general partner of Medical Science Partners, L.P. is Medical Science
            Ventures, L.P. The general partners of Medical Science Ventures,
            L.P., who share voting and investment control over the Shares held
            by Medical Science Partners, L.P., are: Andre L. Lamotte and Joseph
            F. Lovett. Messrs. Lamotte and Lovett are also general partners of
            Medical Science Ventures II, L.P., which is the sole general partner
            of each of Medical Science Partners II, L.P. and Medical Science II
            Co-Investment L.P. Medical Science Partners II, L.P., Medical
            Science II Co-Investment L.P., Mr. Lamotte and Mr. Lovett hold
            96,154 Shares, 13,587 Shares, 8,840 Shares and 13,382 Shares,
            respectively. Messrs. Lamotte and Lovett disclaim beneficial
            ownership of Shares held by Medical Science Partners, L.P., Medical
            Science Partners II, L.P. and Medical Science II Co-Investment L.P.
            except to the extent of their pecuniary interest therein.

            (b) Percent of Class:

            10.1%



<PAGE>   8



- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  8  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------



            (c) Number of shares as to which such person has:

                  (i)      sole power to vote or to direct the vote:

                           8,840 Shares;

                  (ii)     shared power to vote or to direct the vote:

                           1,028,830 Shares;


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 by the Parent Holding Company:
- ----------------------------------------------------------

            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 acquired in the
            ordinary course of business and were not acquired for the purpose of
            and do not have the effect of changing or influencing the control of
            the issuer of such  securities  and were not  acquired in connection
            with or as a participant in any transaction having such purposes or
            effect.

<PAGE>   9



- ---------------------------                         ---------------------------
  CUSIP No.  252842 10 9              13G                 Page  9  of  9 
             -----------                                       ---    --- 
- ---------------------------                         ---------------------------



                                    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.


                                                 MEDICAL SCIENCE
                                                 PARTNERS, L.P.

                                                 By: MEDICAL SCIENCE
                                                     VENTURES, L.P.



Date:  February 11, 1997                        By: /s/ Joseph F. Lovett  
                                                    --------------------------  
                                                    Name: Joseph F. Lovett  
                                                    Title: General Partner


                                                 MEDICAL SCIENCE
                                                 VENTURES, L.P.



Date:  February 11, 1997                        By: /s/ Joseph F. Lovett  
                                                    --------------------------
                                                    Name: Joseph F. Lovett
                                                    Title: General Partner


Date:  February 11, 1997                        /s/ Andre L. Lamotte
                                                ------------------------------
                                                Andre L. Lamotte


Date:  February 11, 1997                        /s/ Joseph F. Lovett  
                                                ------------------------------
                                                Joseph F. Lovett






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