HOECHST MARION ROUSSEL INC
SC 13D, 1999-12-22
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13D



                   Under the Securities Exchange Act of 1934




                         TRANSKARYOTIC THERAPIES, INC.
                         ----------------------------
                                (Name of Issuer)


                     Common Stock par value $.01 per share
- ---------------------------------------------------------------------------
                         (Title of Class of Securities)


                                  893735 10 0
                               -----------------
                                 (CUSIP Number)


                           Edward H. Stratemeier, Esq.
                                 General Counsel
                             Aventis Pharmaceuticals
                             10236 Marion Park Drive
                        Kansas City, Missouri 64137-1405
                                 (816) 966-4000
- - ---------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)



                                December 15, 1999
            -------------------------------------------------------
            (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  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rules 13d-1(e),  13d-1(f), or 13d-1(g),  check the following
box. [ ]



                                  Page 1 of 10

                          Exhibit Index is at Page 9




<PAGE>                                                                2
CUSIP No.  893735 10 0
- ---------------------------------------------------------------------------

1)   Name of Reporting Person and its             Aventis Pharmaceuticals Inc.
     I.R.S. Identification Number                 44-0565557
- ---------------------------------------------------------------------------

2)   Check the Appropriate Box if                                (a)[   ]
     a Member of a Group                                         (b)[ X ]
- ---------------------------------------------------------------------------

3)   SEC Use Only
- ---------------------------------------------------------------------------

4)   Source of Funds                                                  WC
- ---------------------------------------------------------------------------

5)   Check Box if Disclosure of Legal                               [  ]
     Proceedings is Required Pursuant
     to Items 2(d) or 2(e)
- ---------------------------------------------------------------------------

6)   Citizenship or Place of Organization                          Delaware
- ---------------------------------------------------------------------------

               7)   Sole Voting Power                             2,187,408
Number of      ____________________________________________________________
Shares
Beneficially   8)   Shared Voting Power                                   0
Owned by       ____________________________________________________________
Each
Reporting      9)   Sole Dispositive Power                        2,187,408
Person With    ____________________________________________________________

               10)  Shared Dispositive Power                              0
- ---------------------------------------------------------------------------

11)  Aggregate Amount Beneficially Owned                          2,187,408
     by Each Reporting Person
- ---------------------------------------------------------------------------

12)  Check Box If the Aggregate Amount                                 [  ]
     in Row (11) Excludes Certain Shares
- ---------------------------------------------------------------------------

13)  Percent of Class Represented                                      9.7%
     by Amount in Row (11)
- ---------------------------------------------------------------------------

14)  Type of Reporting Person                                            CO
- ---------------------------------------------------------------------------









<PAGE>                                                                3
CUSIP No.  893735 10 0
- ---------------------------------------------------------------------------

1)   Name of Reporting Person and its                         HMR Pharma, Inc.
     I.R.S. Identification Number                    43-1769328
- ---------------------------------------------------------------------------

2)   Check the Appropriate Box if                                  (a)[   ]
     a Member of a Group                                           (b)[ X ]
- ---------------------------------------------------------------------------

3)   SEC Use Only
- ---------------------------------------------------------------------------

4)   Source of Funds                                         Not applicable
- ---------------------------------------------------------------------------

5)   Check Box if Disclosure of Legal                                  [  ]
     Proceedings is Required Pursuant
     to Items 2(d) or 2(e)
- ---------------------------------------------------------------------------

6)   Citizenship or Place of Organization                          Delaware
- ---------------------------------------------------------------------------

               7)   Sole Voting Power                             2,187,408
Number of      ____________________________________________________________
Shares
Beneficially   8)   Shared Voting Power                                   0
Owned by       ____________________________________________________________
Each
Reporting      9)   Sole Dispositive Power                        2,187,408
Person With    ____________________________________________________________

               10)  Shared Dispositive Power                              0
- ---------------------------------------------------------------------------

11)  Aggregate Amount Beneficially Owned                          2,187,408
     by Each Reporting Person
- ---------------------------------------------------------------------------

12)  Check Box If the Aggregate Amount                                 [  ]
     in Row (11) Excludes Certain Shares
- ---------------------------------------------------------------------------

13)  Percent of Class Represented                                      9.7%
     by Amount in Row (11)
- ---------------------------------------------------------------------------

14)  Type of Reporting Person                                            CO
- ---------------------------------------------------------------------------






<PAGE>                                                                4
CUSIP No.  893735 10 0

         This  Schedule  13D is filed  solely to  reflect  the change of name of
Hoechst Marion Roussel, Inc., to Aventis  Pharmaceuticals Inc. and the change of
the  ultimate  parent  entity from  Hoechst  Aktiengesellschaft  to Aventis.  It
replaces a Schedule 13G  currently on file with the  Commission,  although  this
filing is not being made because of Rules 13d-1(e), 13d-1(f), or 13d-1(g).

ITEM 1.   SECURITY AND ISSUER.
- -------   --------------------

     The  securities to which this Schedule  relates are shares of common stock,
par value $0.01 per share ("Common Stock"), of Transkaryotic Therapies,  Inc., a
Delaware  corporation (the "Issuer").  The Issuer's principal  executive offices
are at 195 Albany Street, Cambridge, Massachusetts 02139.

ITEM 2.   IDENTITY AND BACKGROUND.
- -------   ------------------------


     (a) - (c), (f) This Schedule is filed on behalf of Aventis  Pharmaceuticals
Inc., a Delaware  corporation  ("API"),  with a principal  place of business and
principal  office  located at 10236  Marion Park Drive,  Kansas  City,  Missouri
64137-1405.  The  principal  business  of  API is  the  discovery,  development,
manufacturing, marketing, and sale of pharmaceutical compounds for the treatment
of human  diseases.  On December 15, 1999,  API became a  wholly-owned  indirect
subsidiary of Aventis,  a Frech corporation  ("Aventis").  Prior to December 15,
1999,  API was  named  "Hoechst  Marion  Roussel,  Inc."  Information  as to the
executive officers and directors of API is set forth in Exhibit 99.1 hereto.


     This Schedule also is filed on behalf of HMR Pharma, Inc., a

Delaware corporation  ("Pharma"),  which owns a 98.2% equity interest in API and
also became a wholly owned subsidiary of Aventis on December 15, 1999. Pharma is
a  holding  company  for  a  portion  of  the  U.S.  operations  of  Aventis,  a
multinational  life sciences company  headquartered in Strasbourg,  France.  The
principal place of business and principal  office of Pharma is 10236 Marion Park
Drive, Kansas City, Missouri  64137-1405.  Pharma is filing this Schedule solely
with respect to its potential  deemed  indirect  ownership of the Issuer's stock
owned by API.  Information as to the executive  officers and directors of Pharma
and the  Supervisory  and  Management  Boards of Aventis is set forth in Exhibit
99.2 hereto.




     (d) - (e)  During the last five years, neither API, Pharma, nor, to
their knowledge,  any of the persons listed in Exhibits 99.1 or 99.2 hereto, has
been  convicted  in a criminal  proceeding  (excluding  traffic  violations  and
similar  misdemeanors).  During the last five years, neither API nor Pharma nor,
to their  knowledge,  any of the persons listed in Exhibits 99.1 or 99.2 hereto,
has been a party to any civil proceeding of a judicial or administrative body of
competent  jurisdiction  as a result of which any of them was or is subject to a
judgment,  decree,  or final order enjoining future violation of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws.





<PAGE>                                                                5
CUSIP No.  893735 10 0

ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
- -------   --------------------------------------------------

     In May 1994,  API  (then  named  Marion  Merrell  Dow Inc.) and the  Issuer
entered into a Class D Preferred Stock Purchase  Agreement pursuant to which API
purchased  $5  million of the  Issuer's  Class D  Preferred  Stock and agreed to
purchase $5 million of Common Stock at the initial public  offering price at the
time of the Issuer's  initial  public  offering of Common Stock (the "IPO").  In
March 1995,  API purchased $10 million of the Issuer's  Class E Preferred  Stock
pursuant to a Class E Preferred Stock Purchase Agreement.  In December 1995, API
purchased  $7.9 million of the Issuer's  Class F Preferred  Stock  pursuant to a
Class F Preferred  Stock  Purchase  Agreement  among API, the Issuer,  and other
investors. Pursuant to their respective terms, API's shares of Class D, Class E,
and Class F Preferred Stock were converted into an aggregate of 1,854,075 shares
of Common Stock  automatically  upon the closing of the IPO on October 22, 1996.
Immediately  following the closing of the IPO, API purchased  333,333  shares of
Common Stock for $4,999,995 to fulfill its purchase obligation under the Class D
Preferred  Stock  Purchase  Agreement.  The  source of funds  for the  aggregate
purchase  price  of  $27,899,995  paid  by API for its  aggregate  ownership  of
2,187,408  shares of Common Stock (the "Shares") was the working capital of API.
None of such  funds were  borrowed  or  otherwise  obtained  for the  purpose of
acquiring, holding, trading, or voting the Shares.

ITEM 4.   PURPOSE OF TRANSACTION.
- -------   -----------------------

     API acquired the Shares in  connection  with  certain  strategic  alliances
between  API and the  Issuer.  In May 1994 and March  1995,  API and the  Issuer
entered  into  certain  agreements  pursuant  to which the  Issuer  granted  API
exclusive  rights to make,  use and sell worldwide two  therapeutic  products --
gene  activated  protein  erythropoietin  ("GA-EPO")  and a second,  undisclosed
protein -- produced  under patent rights and  technologies  owned by the Issuer.
Under the terms of the agreements, API is obligated to pay the Issuer a total of
$58  million  related to GA-EPO and $67 million  related to the second  protein,
consisting of license fees, equity investments, milestone payments, and research
funding, in addition
to  royalties  on sales of the  products.  API's  future  obligations  primarily
consist of milestone  payments based on the  development  of products  resulting
from the licensed  technology.  The Issuer is responsible  for  delivering  cell
lines  suitable  for  large  scale  manufacturing.  API is  responsible  for the
worldwide  development,  manufacturing  and  marketing  of the  products and the
Issuer will receive a royalty based on net sales.

         API  purchased  its  shares  of Class F  Preferred  Stock in a  private
offering by the Issuer to API and other  investors.  Such shares were  purchased
for investment.

     The foregoing  descriptions are qualified in their entirety by reference to
the Amended and  Restated  License  Agreement  dated March 1, 1995,  the License
Agreement  dated March 1, 1995, the Class D Preferred  Stock Purchase  Agreement
dated May 18, 1994, the Class E Preferred  Stock Purchase  Agreement dated March
1, 1995, and the Class F Preferred  Stock Purchase  Agreement  dated October 26,
1995, which are set forth as Exhibits 99.4 through 99.8 to this Schedule.





<PAGE>                                                                6
CUSIP No.  893735 10 0

         API  continually  reviews its  investments in companies,  including the
Issuer,  with which it has,  or has had, a business or  strategic  relationship.
Such  reviews  may  consider  factors  specific  to the  Issuer,  such as  API's
evaluation of the Issuer's business,  prospects, and financial condition and the
market for the Common Stock, as well as general considerations such as prospects
for  the  businesses  of  API  and  its  affiliates,   liquidity  needs,   other
opportunities,  general economic conditions,  money and stock market conditions,
future developments,  and other factors. As a result of any such review, API may
at any time,  or from time to time,  acquire  or dispose  of  securities  of the
Issuer in the future.

     Except as  described  above,  neither API,  Pharma,  nor Hoechst AG has any
plans or proposals that relate to or would result in any of the events described
in paragraphs (a) through (j) of this Item.

ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.
- -------   -------------------------------------

     (a) The Shares  represent  approximately  9.7% of the Issuer's Common Stock
outstanding at November 10, 1999, on a fully-diluted basis. Except as may be set
forth in any subsequent amendment to this Schedule, neither
Aventis nor Pharma,  any executive officer or director of API or Pharma, nor any
member of the Supervisory Board or Management Board of Aventis beneficially owns
any of the Shares or any other shares of Common  Stock other than through  their
beneficial ownership, if any, of stock of Aventis, Pharma, or API. Pharma, which
is a wholly-owned subsidiary of Aventis,  beneficially owns more than 98% of the
outstanding stock of API.

     (b) API has sole  power  to vote  and to  dispose  of the  Shares.  Neither
Aventis, Pharma, nor any executive officer or director of either API, Pharma, or
Aventis  has any power to vote or to direct  the vote,  or to  dispose  of or to
direct the disposition of, the Shares except to the
extent to the extent that  Aventis,  Pharma,  or any such  executive  officer or
director  may be  deemed  to have any  such  power by  reason  of such  person's
relationship to or position with API, Pharma, or Aventis.

     (c)  None.

     (d)  None.

     (e) Not applicable.

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

     API and the  Issuer  are  parties  with  certain  other  shareholders  to a
Registration  Rights  Agreement  dated as of  November  3,  1993  (as  currently
Amended, the "Registration Rights Agreement"), pursuant to which API has certain
rights with respect to registration under the Securities Act of 1933, as amended
(the  "Act"),  of the Shares.  If the Issuer  proposes  to  register  any of its
securities under the Act, either for its own account or for the account of other
security holders, the Issuer is required under
the Registration Rights Agreement to use its best efforts to include in such
registration the Shares for which API requests registration, subject to such
reduction as may be required by the Issuer's underwriters. In addition,




<PAGE>                                                                7
CUSIP No.  893735 10 0

subject to certain  conditions,  the  holders of not less than 30% of the Common
Stock covered by the Registration  Rights Agreement  ("Registrable  Securities")
may require  the Issuer on not more than two  occasions  to file a  registration
statement   under  the  Act  with  respect  to  such   Registrable   Securities.
Furthermore,  API may require the Issuer on one occasion to file a  registration
statement  under the Act with respect to the shares of Common Stock purchased by
API in connection with the IPO. Subject to certain conditions, the holders of at
least 15% of the Registrable  Securities have the right to require the Issuer to
file an unlimited number of registration  statements on Form S-3,  provided that
such right is not exercised more than once during any  consecutive  twelve-month
period.

     The description of the  Registration  Rights  Agreement is qualified in its
entirety  by  reference  to such  agreement,  a copy of  which  is set  forth as
Exhibits 99.9 and 99.10 hereto.

         Other than the  Registration  Rights  Agreement,  the Class D Preferred
Stock Purchase Agreement,  the Class E Preferred Stock Purchase  Agreement,  the
Class F Preferred Stock Purchase Agreement,  and as described herein,  there are
no contracts,  arrangements,  understandings  or relationships  between or among
API, Pharma,  and/or Aventis and any other person with respect to any securities
of the Issuer.

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.
- -------   ---------------------------------

99.1      Information concerning directors and executive officers of API and
          Pharma.
99.2      Information concerning members of the Supervisory Board and Management
          Board of Aventis.
99.3      Agreement to File Jointly dated  December 22, 1999, by and between API
          and Pharma.
99.4      Class D Preferred Stock Purchase Agreement, dated May 18, 1994, by and
          among the Issuer and API.
99.5      Class E Preferred  Stock Purchase  Agreement,  dated March 1, 1995, by
          and among the Issuer and API.
99.6      Class F Preferred Stock Purchase Agreement, dated October 26, 1995, by
          and among the Issuer and certain Purchasers named therein.
99.7      Amended and Restated  License  Agreement,  dated March 1, 1995, by and
          between API and the Issuer.
99.8      License  Agreement,  dated  March 1, 1995,  by and between API and the
          Issuer.
99.9      Amended and Restated Registration Rights Agreement,  dated November 3,
          1993 and amended on May 13,  1994,  March 1, 1995,  October 26,  1995,
          July 10, 1996 and August 7, 1996,  by and among the Issuer and certain
          holders of the Issuer's Preferred Stock named therein.
99.10     Fifth Amendment to Registration Rights Agreement dated October 1, 1996
          by and among the Issuer and certain holders of the Issuer's  Preferred
          Stock named therein.







<PAGE>                                                                8
CUSIP No.  893735 10 0

                                   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.

                                          AVENTIS PHARMACEUTICALS INC.



Date: December 22, 1999                   By:  /s/ Rebecca R. Tilden
                                               Rebecca R. Tilden
                                             Vice President and Secretary



     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.

                                          HMR PHARMA, INC.



Date:  December 22, 1999                    By:  /s/ Rebecca R. Tilden
                                         Vice President and Assistant Secretary






























<PAGE>                                                                9
CUSIP No.  893735 10 0

                                 EXHIBIT INDEX


Exhibit No.         Description                                  Page No.
- -----------         ------------                                 ---------

99.1      Information concerning directors and
          executive officers of API and Pharma
             (to be filed by amendment).
99.2      Information concerning members of the Supervisory
             Board and Management Board of Aventis
             (to be filed by amendment).
99.3      Agreement to File Jointly dated December 22,                 10
          1999, by and between API and Pharma.
99.4      Class D Preferred Stock Purchase Agreement,
          dated May 18, 1994, by and between the Issuer
          and API (incorporated by reference from
          Exhibit 10.6 to Amendment No. 5 to the
          Registration Statement on Form S-1 of the
          Issuer filed with the Securities and Exchange
          Commission (the "Commission") on October 15,
          1996 (the "Registration Statement")).
99.5      Class E Preferred  Stock Purchase  Agreement,
          dated March 1, 1995, by and between the Issuer
          and API (incorporated by reference from Exhibit
          10.7 to Amendment No. 5 to the
          Registration Statement).
99.6      Class F Preferred Stock Purchase Agreement,
          dated October 26, 1995, by and among the
          Issuer and certain Purchasers named therein
          (incorporated by reference from Exhibit 10.8
          to Amendment No. 5 to the Registration
          Statement).
99.7      Amended and Restated  License  Agreement,
          dated March 1, 1995, by and
          between API and the Issuer  (incorporated
          by  reference  from Exhibit 10.33 to Amendment
          No. 5 to the Registration Statement).
99.8      License Agreement, dated March 1, 1995, by
          and between API and the Issuer (incorporated
          by reference from Exhibit 10.34 to Amendment
          No. 5 to the Registration Statement).
99.9      Amended and Restated Registration Rights
          Agreement, dated November 3, 1993 and amended
          on May 13, 1994, March 1, 1995, October 26,
          1995, July 10, 1996 and August 7, 1996, by
          and among the Issuer and certain holders of
          the Issuer's Preferred Stock named therein
          (incorporated by reference from Exhibit 10.11
          to Amendment No. 5 to the Registration
          Statement).
99.10     Fifth Amendment to Registration Rights
          Agreement dated October 1, 1996 by and among
          the Issuer and certain holders of the
          Issuer's Preferred Stock named therein
          (incorporated by reference from Exhibit 10.36
          to Amendment No. 5 to the Registration
          Statement).





<PAGE>                                                                10
CUSIP No.  893735 10 0

                                  EXHIBIT 99.3

                           AGREEMENT TO FILE JOINTLY

     We,  the  undersigned,  hereby  express  our  agreement  that the  attached
Schedule 13D is filed on behalf of each of us.

                                         AVENTIS PHARMACEUTICALS INC.



Date: December 22, 1999                   By:  /s/ Rebecca R. Tilden
                                               Rebecca R. Tilden
                                             Vice President and Secretary


                                          HMR PHARMA, INC.



Date:  December 22, 1999                    By: /s/ Rebecca R. Tilden
                                         Vice President and Assistant Secretary







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