Document:

Exhibit 10.22

                                    AGREEMENT
                                    ---------

         THIS AGREEMENT is made and entered into as of this 15th day of August
2000, by and among George Lee ("Lee"), Mike Chen ("Chen"), Alex Chen ("Alex,"
and together with Lee and Chen, the "Founders") and Mcglen Internet Group, Inc.,
a Delaware corporation (the "Company").

         WHEREAS, the Founders collectively own more than 63% of the issued and
outstanding shares of common stock of the Company; and

         WHEREAS, the Founders have recruited to the Board of Directors a group
of persons who the Founders believe can provide significant strategic direction,
advice and guidance to the Company, and, as a result significantly increase the
value of the shares owned by the Founders; and

         WHEREAS, the Company is in need of additional capital to fund its
operations, and the Founders have collectively agreed to make available to the
Company an aggregate of 10,000,000 shares of Common Stock of the Company (the
"Equity Pool") to be issued by the Company to provide incentives to specific
individuals and to assist the Company in raising capital, in each case without
diluting the currently outstanding Common Stock of the Company; and

         WHEREAS, the Founders are making available to the Company the shares
included in the Equity Pool to assist in the development of the Company and
management's efforts to raise capital for the Company, and, thereby enhance the
value of the shares of Common Stock of the Company owned by the Founders which
are not being contributed to the Equity Pool;

         NOW, THEREFORE, in consideration of the foregoing and the agreements
set forth herein, and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties agree as follows:

         1. CREATION OF EQUITY POOL. Each of the Founders agrees to, and hereby
does, make available to the Company the number of shares of Common Stock of the
Company set forth opposite each Founder's name below:

          NAME                                    NO. OF EQUITY POOL SHARES
          ----                                    -------------------------
          George Lee                                      4,666,667
                                                          ---------
          Mike Chen                                       4,666,667
                                                          ---------
          Alex Chen                                        666,666
                                                           -------

         Each Founder shall deliver to the Chairman of the Board of the Company
certificates representing the number of shares of Common Stock of the Company
which each Founder is contributing to the Equity Pool, together with stock
powers in blank, in sufficient form to transfer the Equity Pool shares on the
books of the Company.

         2. USE OF EQUITY POOL. The shares included in the Equity Pool shall be
used by the Company to grant incentives to management and directors, to assist
in the development and growth of the Company or to assist the Company, directly
or indirectly, in raising capital to fund its operations and development
(collectively, "Permitted Uses"). Shares included in the Equity Pool may only be
used for Permitted Uses and in such amounts and for such purposes as have been
specifically authorized and approved by the Board of Directors of the Company.

                                      -1-
<PAGE>

In the case of each such Permitted Use of the Equity Pool, the Company shall be
entitled to transfer from the Equity Pool the total number of shares to be
issued for such Permitted Use, with the shares to be transferred from the
accounts of each Founder as follows: (a) the first 8,000,000 shares of the
Equity Pool allocated for a Permitted Uses shall be deducted 50% from the
account of George Lee and 50% from the account of Mike Chen in the Equity Pool;
and (b) the balance of the shares of the Equity Pool allocated for Permitted
Uses shall be deducted from the accounts of the 3 Founders on an equal basis.

         3. FOUNDER'S COMPENSATION. McGlen agrees to pay the founders a 5%
consulting fee of any cash received by the firm through "permitted uses" of the
pool, immediately upon receipt of funds.

         4. FORM OF EQUITY POOL AWARDS. Each Founder hereby acknowledges and
agrees that the Company shall be entitled to use the Equity Pool by direct
transfer of shares to members of management, directors or to third parties or by
the granting of options, warrants or other rights to acquire shares in the
Equity Pool. The Company shall also be entitled to use the shares in the Equity
Pool by contribution of such shares to the Company for cancellation in
connection with the original issuance by the Company of a corresponding number
of shares for a Permitted Use.

         5. POWER OF ATTORNEY. Each Founder hereby appoints the Chief Financial
Officer of the Company (or his designee) as the attorney-in-fact for such
Founder, with full power and authority to transfer, use and deal with the shares
of such Founder included in the Equity Pool.

         6. FURTHER ASSURANCES. Each Founder hereby agrees to execute and
deliver to the Company such further documents and instruments, including,
without limitation, stock powers, reasonably requested by the Company in
connection with the shares included in the Equity Pool, and the transfer and use
of such shares.

         7. RESTRICTED SALE OF SHARES.

         7.1 Until the 18 months of the date of this Agreement, Mike Chen and
George Lee agree not to sell, transfer or otherwise alienate, directly or
indirectly, any shares of Common Stock of the Company owned, directly or
indirectly, by such Founder except (a) shares transferred to the Equity Pool and
allocated and used for Permitted Uses; and (b) with respect to the remaining
shares of Common Stock of the Company owned, directly or indirectly, by such
Founder (the "Remaining Shares"), to sell, transfer or alienate not more than
(i) one percent of the Remaining Shares of such Founder in any one calendar
month period and (ii) ten percent of the Remaining Shares of such Founder in any
consecutive 12 calendar month period.

         7.2 Until the 18 months of the date of this Agreement, Alex Chen agrees
not to sell, transfer or otherwise alienate, directly or indirectly, any shares
of Common Stock of the Company owned, directly or indirectly, by Alex Chen
except (a) shares transferred to the Equity Pool and allocated and used for
Permitted Uses; and (b) with respect to the remaining shares of Common Stock of
the Company owned, directly or indirectly, by Alex Chen (the "Remaining
Shares"), to sell, transfer or alienate not more than (i) 2% of the Remaining
Shares of such Founder in any one calendar month period and (iii) twenty percent
of the Remaining Shares of Alex Chen in any consecutive 12 calendar month
period.

                                      -2-
<PAGE>

         8. FOUNDER REPRESENTATIONS AND COVENANTS. Each Founder hereby
represents and warrants to the Company that such Founder has the power and
authority to enter into this Agreement, and to deliver the shares of Common
Stock of the Company being delivered by such Founder to the Equity Pool, free of
any pledges, liens, claims or encumbrances (including, without limitation, any
rights of first refusal, preemptive rights or other charges as to such shares)
(collectively, an "Encumbrance"). Each Founder covenants and agrees not to take
any action (or permit any action to be taken), whether voluntary or by operation
of law, that would cause or permit the shares of such Founder included in the
Equity Pool to be subject to any Encumbrance or to otherwise take any action to
transfer or alienate any interest in the shares transferred to the Equity Pool.

         9. TERMINATION OF EQUITY POOL. To the extent that shares of Common
Stock of the Company remain in the Equity Pool, which shares have not been
allocated or used for a Permitted Use on or prior to the 18-month anniversary of
the date of this Agreement, then any shares so remaining shall be released from
this Agreement, and certificates representing the shares not so issued or
allocated shall be returned to such Founder in proportion to such Founder's
proportionate interest in such shares.

         10. INDEMNIFICATION OF FOUNDERS. The Company will use reasonable
efforts to structure the transactions in which the shares included in the Equity
Pool are used by the Company to not cause the Founders to recognize gain (for
federal or state income tax purposes) on the contribution of the shares to the
Equity Pool or in connection with the use by the Company of any of the Equity
Pool shares. To the extent that the Founders, or any of them, are required to
recognize gain for federal or state income tax purposes with respect to the
shares included in, or used from, the Equity Pool, the Company agrees to
indemnify and hold such Founder harmless with respect to any such tax liability.

         11. AMENDMENT AND MODIFICATIONS. This Agreement may be amended,
modified and supplemented only by written agreement among the parties which
states that it is intended to be a modification of this Agreement.

         12. NOTICES. All notices, requests, demands and other communications
required or permitted hereunder shall be in writing and shall be deemed to have
been duly given if delivered by hand or mailed, certified or registered mail
with postage prepaid:

                  (a)      if to the Company, to:

                           3002 Dow Avenue
                           Suite 114
                           Tustin, California 92780
                           Facsimile No.: (714) 838-9403
                           Attention:  Chairman of the Board

or to such other person or address as the Company shall furnish to the Founders
in writing;

                  (b)      if to the Founders to:

                           3002 Dow Avenue
                           Suite 114
                           Tustin, California 92780
                           Facsimile No.:  (714)

or to such other person or address as a Founder shall furnish to the Company in
writing.

                                      -3-
<PAGE>

         13. ASSIGNMENT. This Agreement and all of the provisions hereof shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns, but neither this Agreement nor any
of the rights, interests or obligations hereunder shall be assigned by any of
the parties hereto without the prior written consent of the other parties.

         14. GOVERNING LAW. This Agreement and the legal relations among the
parties hereto shall be governed by and construed in accordance with the laws of
the State of California, as applied to contracts entered into and to be wholly
performed within the State of California.

         15. COUNTERPARTS. This Agreement may be executed simultaneously in two
or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

         16. HEADINGS. The headings of the paragraphs of this Agreement are
inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

         17. Entire Agreement. This Agreement and the other documents and
certificates delivered pursuant to the terms hereof, set forth the entire
agreement and understanding of the parties hereto in respect of the subject
matter contained herein, and supersede all prior agreements, promises,
covenants, arrangements, communications, representations or warranties, whether
oral or written, by any officer, employee or representative of any party hereto.

                                      -4-
<PAGE>

         IN WITNESS WHEREOF, the undersigned have executed and delivered this
Agreement as of the date first set forth above.

                                                        /S/ GEORGE LEE
                                             -----------------------------------
                                             George Lee

                                                        /S/ MIKE CHEN
                                             -----------------------------------
                                             Mike Chen

                                                        /S/ ALEX CHEN
                                             -----------------------------------
                                             Alex Chen

                                             Mcglen Internet Group, Inc.

                                             By:        /S/ GRANT TREXLER
                                                --------------------------------
                                                Name:   GRANT TREXLER
                                                Title:  CFO

                                      -5-<PAGE>

                                                                     EXHIBIT 4.1

Notarial Deed A.Prot. 1999/251
dated 29.12.1999 of the Notary
Dr. Werner Wenger, Basel

                                 NOTARIAL DEED

                              Partners' Agreement

Negotiated at Basel, Switzerland, on the 29th (twenty-ninth) day of December
1999 (nineteen hundred and ninety-nine).

Before me, the undersigned Notary Public

                               Dr. Werner Wenger

at my official office at Basel, appeared today:

1.  Mr. Brian Jeffrey Schwab, lawyer, born on July 18, 1964, of French and
    -------------------------
    U.S.A. nationality, address: 7 rue des Pierres Plantees, F-69001 Lyon, who
    identified himself by presentation of his French and U.S. passports,

    and who declared not to act for himself, but in the name and on behalf of

    a)  Aventis, formerly known as "Rhone-Poulenc SA",
        registered with the Commercial Register of Strasbourg under the number B
        542 064 308, having its business address at Espace Europeen de
        l'Entreprise, F-67300 Schiltigheim, France

        based on a power of attorney, dated December 8, 1999, a fax copy of
        which was presented to the acting Notary, the original of which shall be
        attached to this deed as Exhibit A upon receipt;

    b)  Rhone-Poulenc Sante Vegetale et Animale,
        registered with the Commercial Register of Lyon under the number B 352
        704 746, having its registered office in F-69009 Lyon, 14-20, rue Pierre
        Baizet,

        based on a certified power of attorney, dated December 10, 1999, a
        certified copy of which was presented to the acting Notary and is
        attached to this deed as Exhibit B.
<PAGE>

                                       2

2.  Mr. Joachim Thole, Attorney-at-law, born on November 9, 1963, of German
    ------------------
    nationality, business address: c/o Hoechst Aktiengesellschaft, D-65926
    Frankfurt am Main, personally known to the acting Notary,

    and who declared not to act for himself, but in the name and on behalf of

    Hoechst Aktiengesellschaft,
    registered with the Commercial Register of the Local Court of Frankfurt am
    Main under the number HRB 14500, having its business seat at D-65926
    Frankfurt am Main, Germany,

    based on a certified power of attorney, dated December 16, 1999, the
    original of which was presented to the acting Notary and a hereby certified
    copy of which is attached to this deed as Exhibit C.

3.  Mr. Horst Krueger, Attorney-at-law, born on July 6, 1946, of German
    -----------------
    nationality, business address: c/o Schering Aktiengesellschaft,
    Muellerstrasse 178, D-13353 Berlin, Germany, personally known to the acting
    Notary,

    and who declared not to act for himself, but in the name and on behalf of

    a)  Schering Aktiengesellschaft,
        registered with the Commercial Register of the Local Court of Berlin-
        Charlottenburg under the number 93 HRB 283, having its business address
        at Muellerstrasse 170-178, D-13342 Berlin, Germany,

        based on a certified power of attorney, dated December 20, 1999, the
        original of which was presented to the acting Notary and a hereby
        certified copy of which is attached to this deed as Exhibit D.

    b)  NOR-AM Chemical Company,
        340 Changebridge Road, P.O. Box 1000,
        Montville, New Jersey 07045-1000, USA

        based on a certified power of attorney, dated December 17, 1999, the
        original of which was presented to the acting Notary and a hereby
        certified copy of which is attached to this deed as Exhibit E.
<PAGE>

                                       3

                             ____________________

The persons appearing requested this Notarial Deed to be recorded in the English
language. The acting Notary Public, who is in sufficient command of the English
language, ascertained that the persons appeared are also in command of the
English language. After having been instructed by the acting Notary Public, the
persons appeared waived the right to obtain the assistance of a sworn
interpreter and to obtain a certified translation of this Deed.

The acting Notary advised the persons appearing that a notary who or whose
partners in the law firm have formerly acted as legal advisors to one of the
parties involved in the matter to be notarized would not be entitled to take
office as a notary in the matter at hand pursuant to (S) 233 Sect. 1(4) of the
Introductory Act of the Canton Basel-City relating to the Swiss Civil Code which
provision corresponds with the so-called "Vorbefassungsverbot" under the German
Act of Notarization ((S) 3 Sect. 1(7)). The acting Notary states that he himself
and his firm have not been involved in the matter at hand in the meaning of said
provisions. By approving the present Agreement, the Parties hereto shall confirm
such statement of the acting Notary.

                             ____________________

The persons appearing ask for the notarization of the following Partners'
Agreement.
<PAGE>

                                       4

                              PARTNERS' AGREEMENT

                                     AMONG

Schering AG
13342 Berlin
Germany

                                                        (hereinafter "Schering")
                                      and

NOR-AM Chemical Company
340 Changebridge Road
P.O. B. 1000
Montville, New Jersey 07045-1000
(and its legal successor, if any)

                                      and

Hoechst AG
65926 Frankfurt am Main
Germany

                                                         (hereinafter "Hoechst")

                                      and

Aventis
Espace Europeen de l'Entreprise
67300 - Schiltigheim

                                                         (hereinafter "Aventis")

                                      and

Rhone-Poulenc Sante Vegetale et Animale
14-20, rue Pierre Baizet
B.P. 9163
69009 Lyon
<PAGE>

                                       5

                                   RECITALS

WHEREAS, Hoechst and Aventis suggested to Schering to combine the worldwide agro
businesses of Aventis on the one hand and of Hoechst and Schering on the other
hand.  Schering has agreed to such combination and to participate therein;

WHEREAS, through such a combination of businesses, the direct or indirect equity
participation of Schering would be substantially reduced against its current
shareholding in AgrEvo which it considers strategic;

WHEREAS, the Principals (as defined below) have entered into an Agro Business
Combination Agreement dated June 23, 1999 (the "Agro Business Combination
Agreement") whereby Hoechst and Aventis gave certain assurances to Schering, as
described in more detail therein;

WHEREAS, (S) 3 of the Agro Business Combination Agreement provides that a
partners' agreement will be entered into among the Parties to reflect the terms
thereof;

WHEREAS, the Parties wish to set forth their respective rights in the Company
(as defined below);

NOW, THEREFORE, in consideration of the respective covenants of the Parties as
set forth below, the Parties agree as follows:

ARTICLE I - CERTAIN DEFINITIONS

The following capitalized terms used in this agreement shall have the following
meanings:

"Affiliate" shall mean, with respect to a person, any entity (i) which, directly
or indirectly, holds in such person, or is held by such person with, 50% (fifty
percent) or more of the capital or voting rights, or (ii) which directly or
indirectly controls, is controlled by, or is under joint control with, such
person.  For purposes of this agreement, any reference to a Wholly Owned
Affiliate of a person shall mean any entity of which all of the capital and
voting rights are held by such person, except for any directors' qualifying
shares or similar requirements.

"AgrEvo" shall mean AgrEvo GmbH and AgrEvo US.

"AgrEvo GmbH" shall mean Hoechst Schering AgrEvo GmbH, a German company located
in Berlin, Germany.

"AgrEvo US" shall mean AgrEvo USA Company, a partnership governed by Delaware
law.

"Closing" shall have the meaning set forth in Section 11.2 hereof.

"Company" shall have the meaning set forth in Section 2.2 hereof.
<PAGE>

                                       6

"Control" shall be determined according to (S) 17 AktG (German Corporation Act)
or any successor thereof.

"Group" shall mean the Hoechst Group, the Aventis Group or the Schering Group,
as the case may be.

"Hoechst Group" shall mean Hoechst and any other direct or indirect Wholly Owned
Affiliate of Hoechst which is or becomes a shareholder in the Company.

"Hoechst Party" shall mean a member of the Hoechst Group.

"Party" shall mean any of Aventis, Rhone-Poulenc Sante Vegetale et Animale,
Hoechst, Schering, NOR-AM Chemical Company (and its legal successor, if any) and
any of their direct or indirect Wholly Owned Affiliates which becomes a
shareholder in the Company.

"Principal" shall mean Aventis, Hoechst or Schering, as applicable.

"Aventis Group" shall mean Aventis, Rhone-Poulenc Sante Vegetale et Animale, and
any other direct or indirect Wholly Owned Affiliate of Aventis which is or
becomes a shareholder in the Company, with the exception of the Hoechst Group.

"Aventis Party" shall mean a member of the Aventis Group.

"RP Agro" shall mean Rhone-Poulenc Agro S.A., a French company located in Lyon,
France.

"Schering Group" shall mean Schering, NOR-AM Chemical Company (and its legal
successor, if any), and any other direct or indirect Wholly Owned Affiliate of
Schering which is or becomes a shareholder in the Company.

"Schering Party" shall mean a member of the Schering Group.

"Shares" shall mean (i) shares and any other title representing a share of the
capital and/or granting voting rights, issued or to be issued by the Company,
and (ii) rights which might be detached from these shares or titles, such as
preferential rights of subscription or attribution, and (iii) titles providing
access to the share capital of the Company and/or providing voting rights in the
Company by way of conversion, exchange, reimbursement or any other manner and
(iv) any title which could result from these shares, rights and titles provided
in paragraphs (i) to (iii) hereof or which could be substituted to these shares,
rights and titles through any transaction in which the Company would be
involved.

ARTICLE II - BUSINESS COMBINATION

2.1  The Parties agree to operate a worldwide agro business, in particular
     integrating the existing businesses of RP Agro and AgrEvo, realizing
     synergies and extending the businesses as well as developing new businesses
     in this field.
<PAGE>

                                       7

2.2  Therefore, Schering on behalf of itself and its Wholly Owned Affiliates
     gives its consent to (i) the transfer by Hoechst of its shares in AgrEvo
     GmbH (required under (S) 11(1) of the AgrEvo partners' agreement between
     Schering and Hoechst dated November 25, 1993 (the "AgrEvo Agreement")) to
     AgrEvo Participations S.A., Gif-sur-Yvette, France, or into another agreed
     holding company using a new name for the agro business (the "Company"), and
     any transfer necessary to achieve the envisaged corporate structure, (ii)
     the direct or indirect transfer of Hoechst's stake in AgrEvo US into the
     Company (which consent is being given pursuant to Section 5.01 of the U.S.
     Partnership Agreement), and any transfer necessary to achieve the envisaged
     corporate structure, and (iii) the acquisition of competing activities by
     Hoechst through its business combination with Aventis (required under (S)
     17 of the AgrEvo Agreement).

     In addition, Hoechst on behalf of itself and its Wholly Owned Affiliates
     gives its consent to (i) the transfer by Schering of its shares in AgrEvo
     GmbH (required under (S) 11(1) of the AgrEvo Agreement) to the Company, and
     any transfer necessary to achieve the envisaged corporate structure, and
     (ii) the direct or indirect transfer of Schering's stake in AgrEvo US into
     the Company (which consent is being given pursuant to Section 5.01 of the
     U.S. Partnership Agreement), and any transfer necessary to achieve the
     envisaged corporate structure.

2.3  In addition, Schering both (i) waives its call option rights under (S)
     15(1) of the AgrEvo Agreement and consents to the change of control of
     Hoechst, by way of the Exchange Offer (as defined below), and (ii) will
     participate in the integration of AgrEvo with RP Agro in the Company, and
     in particular will directly or indirectly contribute its shares in AgrEvo
     GmbH and its stake in AgrEvo US to the Company.

2.4  It is further agreed that the following rights in the Company are granted
     to the Schering Parties in consideration of the aforementioned consents,
     waiver and participation by Schering.

ARTICLE III - CONTRIBUTIONS TO THE COMPANY

In order to implement the business combination referred to in the opening
recital hereof, the following contributions to the Company shall be made by the
Parties at Closing.  The Parties agree to enter into all necessary  agreements,
and to take all appropriate actions, in order to implement these contributions.

3.1  Contributions of the Aventis Parties
     ------------------------------------

     The Aventis Parties shall contribute or cause to be contributed to the
Company all of the shares in RP Agro, including all of the shares of RP Holdings
Inc.
<PAGE>

                                       8

3.2  Contributions of Hoechst
     ------------------------

     Hoechst shall contribute or cause to be contributed to the Company (i) all
of its shares in AgrEvo GmbH and (ii) all of its direct and indirect stake in
AgrEvo US.

3.3  Contributions of the Schering Parties
     -------------------------------------

     The Schering Parties shall contribute or cause to be contributed to the
Company (i) all of its shares in AgrEvo GmbH and (ii) all of its direct and
indirect stake in AgrEvo US.

ARTICLE IV - SHAREHOLDING

4.1  Upon the consummation of the contributions referred to in Article III
     hereof, the Company will (directly or indirectly) be owned by Hoechst,
     Schering and Aventis.  Schering will (directly or indirectly) own shares in
     the Company in accordance with its current shareholding in AgrEvo (40%) and
     according to the relative value of AgrEvo and RP Agro.

4.2  The values of both AgrEvo and RP Agro have been determined by investment
     bankers representing Aventis, Hoechst and Schering, using customary
     valuation methods and giving in particular consideration to the potential
     of the product pipeline, the circumstances described in the Preamble hereof
     and Schering's commitment to participate pro-rata in an increase of the
     capital reserves of AgrEvo GmbH in the amount of DM 772 (seven hundred
     seventy-two) million prior to Closing and in any event prior to December
     31, 1999.  The resulting direct and indirect equity participation for
     Schering in the Company was determined to be 24% (twenty-four per cent).

4.3  The determination of the equity participation of 24% is based in part on
     the following items which are hereby represented by Aventis:

     (i)   the net equity of RP Agro as of September 30, 1998 was not lower than
           FF 1.8 billion;

     (ii)  the net financial debt, taking into account the Capital Equity Notes,
           of RP Agro as of September 30, 1998 did not exceed DM 2.3 billion;

     (iii) provisions and funding in respect of the post-retirement benefits of
           RP Agro as of December 31, 1998 was not lower than 88.5% of the
           projected benefit obligations calculated according to SFAS 87.

4.4  Schering has been entitled to participate in the pre-closing due diligence
     into RP Agro for information purposes only.
<PAGE>

                                       9

ARTICLE V - GOVERNANCE OF THE COMPANY

5.1  Corporate Bodies of the Company
     -------------------------------

     The Company shall be a French corporation with a dual board structure
     (societe anonyme a directoire et conseil de surveillance), whose corporate
     bodies shall be:

     (i)    the shareholders' meeting;
     (ii)   the supervisory board (conseil de surveillance); and
     (iii)  the management board (directoire).

5.2  Shareholders' Meeting
     ---------------------

     (a)    The shareholders' meeting of the Company shall meet at least once a
            year.

     (b)    Unless otherwise required by applicable corporate law, decisions at
            shareholders' meetings shall be taken by simple majority. The
            Company will have only one class of Shares, unless otherwise decided
            by the extraordinary shareholders' meeting of the Company (which
            would result in an amendment to its articles of incorporation). Each
            share shall carry one vote. The Parties shall ensure that the
            articles of association of the Company will not provide for any
            double voting rights.

5.3  Supervisory Board (Conseil de surveillance)
     -------------------------------------------

     5.3.1  Composition and Meetings of the Supervisory Board
            -------------------------------------------------

     (a)    The supervisory board of the Company shall supervise the actions of
            the management board and shall vote on the matters subjected to its
            consent. The supervisory board may establish committees, such as a
            finance committee, an audit committee and a compensation committee.

            The members of the supervisory board of the Company shall be
            appointed for a period of 5 (five) years, which shall terminate,
            unless terminated earlier, at the end of the general shareholders'
            meeting of the Company called to approve the annual accounts of the
            Company which is held in the year during which the term of said
            members expires. Any member of the supervisory board shall remain in
            office for the term he/she is appointed for unless he/she is revoked
            by the shareholders' meeting of the Company or he/she resigns or
            dies. Members of the supervisory board of the Company may be re-
            elected. The members of the supervisory board shall among themselves
            elect a chairman and a vice-chairman, which shall be individuals.

            Vacancies shall be filled as soon as possible. The Parties shall
            ensure that in case of a replacement of a vacancy, the new member of
            the supervisory board which
<PAGE>

                                       10

            is elected or coopted shall be chosen from a list of candidates
            submitted by the Group who had nominated the member to the now
            vacant position.

            (b)  (i)  The representation of the Hoechst Group, the Aventis Group
                      and the Schering Group on the supervisory board of the
                      Company shall be proportional to their respective equity
                      interest in the Company, provided that at all times
                      (subject to the provisions of Section 12.1 hereof) at
                      least one of the supervisory board members shall be
                      elected from a list of candidates submitted by Schering.
                      The initial supervisory board of the Company shall be
                      composed of four members, which shall be appointed by the
                      general meetings of the shareholders of the Company. No
                      more than one-third of the members of the supervisory
                      board at any time may be 75 (seventy-five) years of age or
                      more. In the event that more than one third of the members
                      of the supervisory board become 75 (seventy-five) years of
                      age or more, the oldest member(s) shall be deemed to
                      resign immediately.

                 (ii) The initial supervisory board being composed of four
                      members, the Parties shall ensure that their respective
                      representation on the initial supervisory board shall be
                      as follows:

                      -  two members shall be elected from a list of candidates
                         submitted by the Aventis Group, which will initially
                         hold 47.56 % of the Company (such percentage to be
                         adjusted subsequently to 47.93% pursuant to Section
                         11.4 hereof);

                      -  one member shall be elected from a list of candidates
                         submitted by the Hoechst Group, which will initially
                         hold 28.27 % of the Company (such percentage to be
                         adjusted subsequently to 28.07% pursuant to Section
                         11.4 hereof), and

                      -  one member shall be elected from a list of candidates
                         submitted by the Schering Group, which will initially
                         hold 24.17 % of the Company (such percentage to be
                         adjusted subsequently to 24.0% pursuant to Section 11.4
                         hereof).

                      The Parties shall be free to determine the number of
                      candidates included in their respective lists of
                      proposals.

               (iii)  In addition, the Parties shall ensure that the Schering
                      Group will have the right to a representation on any
                      committee of the supervisory board reflecting its
                      shareholding ratio in the Company, and which shall not be
                      less than one seat on any such committee.
<PAGE>

                                       11

               (iv) The articles of association of the Company shall provide
                    that each member of the supervisory board shall be required
                    to hold one share in the Company.  As a result, in order to
                    preserve each Group's ownership in the Company, each Group
                    shall lend each of the members of the supervisory board
                    elected from the list of candidates submitted by it one
                    share pursuant to a "pret de consommation" (share loan
                    transferring the ownership of the share).  The "pret de
                    consommation" shall provide that the holder of the share
                    shall grant to the relevant Party, no later than fifteen
                    days prior to each shareholders' meeting of the Company, a
                    power of attorney to vote the share at such meeting, failing
                    which the "pret de consommation" shall automatically
                    terminate and the share shall automatically be re-
                    transferred to the relevant Party who had lent the share.
                    The "pret de consommation" shall also provide that upon the
                    holder ceasing to be a member of the supervisory board for
                    any reason whatsoever, the holder shall be deemed
                    irrevocably to have re-transferred the share to the relevant
                    Party.  In addition, each member of the supervisory board
                    shall, in its role as a shareholder, grant an irrevocable
                    power of attorney to the holder of the Company's share
                    register to proceed with all formalities to effect such re-
                    transfer to the relevant Party.

          (c)  The supervisory board of the Company shall meet at least once
               every quarter and as often as the interest of the Company so
               requires.  Meetings of the supervisory board of the Company shall
               be called by the chairman of the supervisory board, either on his
               own initiative or at the request of any member of the supervisory
               board or of any member of the management board.  If following
               such a request the chairman of the supervisory board fails to
               convene such a meeting, the requesting persons may convene the
               meeting themselves.

               Meetings of the supervisory board of the Company shall be
               convened in writing (including by fax), upon no less than eight
               days' prior notice.  Meetings of the supervisory board shall take
               place at the registered office of the Company or at any other
               place indicated in the invitation, whether in France or abroad.

               Resolutions may be taken if a quorum is met.  A quorum shall
               exist in a meeting of the supervisory board if at least half of
               all the members of the supervisory board attend the meeting,
               provided that in any case at least two members of the supervisory
               board must attend.

               Resolutions of the supervisory board and any committee of the
               supervisory board shall be taken by simple majority of all the
               members present or represented at the meeting, provided that the
               rights of Schering pursuant to Section 6.2 hereof shall remain
               unaffected.  The chairman of
<PAGE>

                                       12

               the supervisory board and any committee thereof shall not have a
               casting vote, and the by-laws of the Company shall so provide.

               Any member of the supervisory board may vote by proxy by giving a
               power of attorney to another member of the supervisory board;
               provided, however, that at any one meeting of the supervisory
               --------  -------
               board, a member of the supervisory board present at such meeting
               may only carry one proxy.

               The working language of the supervisory board shall be English,
               unless otherwise required by mandatory law, in which case an
               English language translation shall be provided simultaneously.

     5.3.2  Powers of the supervisory board
            -------------------------------

     (a)    The supervisory board shall exercise the permanent supervision of
            the management of the Company by the management board and shall vote
            on the matters subjected to its consent.

     (b)    The supervisory board shall exercise all the powers assigned to it
            by applicable law, including, but not limited, to the following:

            (i)    appointment of the members and the chairman of the management
                   board (president du directoire) and any managing director
                   (directeur general);

            (ii)   proposal to the general shareholders' meeting for the
                   revocation of any member(s) of the management board;

            (iii)  determination of the compensation of the members of the
                   management board;

            (iv)   at any time of the year, the supervisory board shall carry
                   out such verifications and supervision as it deems
                   appropriate and may require any document which it deems
                   useful for the accomplishment of its duties;

            (v)    the supervisory board shall present to the annual ordinary
                   general shareholders' meeting of the Company its observations
                   on the report of the management board and on the annual
                   accounts;

            (vi)   approval of third-party guarantees given by the Company.

            (vii)  approval of the complete or partial divestment of equity
                   interests (participations) in other entities;

            (viii) approval of the sale of real estate assets (immeubles par
                   nature).

            (ix)   approval of pledges and other sureties granted by the
                   Company.
<PAGE>

                                       13

          The Parties shall use their best efforts so that the members of the
          supervisory board establish appropriate delegations to the management
          board, with the power to sub-delegate, with respect to the decisions
          referred to in clauses (vi) through (ix) immediately above.

     (c)  The powers of the supervisory board will also include, in addition to
          the legal requirements, approval of the following actions:

          (i)   the annual budget;

          (ii)  any capital expenditures and investments by the Company not
                contemplated by the annual budget and exceeding Euro 50 (fifty)
                million; and

          (iii) any matter otherwise deemed material by the management board
                and submitted to the supervisory board for approval.

5.4  Management Board (Directoire)
     -----------------------------

     5.4.1  Composition and Meetings of the Management Board
            ------------------------------------------------

     (a)    The Company shall be managed by a management board, which shall be a
            collegial entity composed of up to five individuals appointed by the
            supervisory board of the Company and which shall be responsible for
            deciding general policy matters and determining the overall business
            and financial strategy of the Company, under the supervision of the
            supervisory board. The management board may establish committees.
            The initial management board of the Company shall be composed of two
            members.

            The Parties acknowledge and agree that the Schering Group shall have
            no right to any representation on the management board of the
            Company.

            No person may be appointed as a member of the management board if
            he/she is over 70 (seventy) years of age. Any member of the
            management board who reaches the age of 70 (seventy) shall be deemed
            to have resigned from office at the end of the following meeting of
            the supervisory board.
            Members of the management board shall not be required to hold shares
            in the Company.

     (b)    The members of the management board of the Company shall be
            appointed for a period of 5 (five) years, which shall terminate at
            the end of the general shareholders' meeting of the Company called
            to approve the annual accounts of the Company which is held in the
            year during which the term of said members expires. Any member of
            the management board shall remain in office for the terms he/she is
            appointed for unless he/she is revoked by the shareholders'
<PAGE>

                                       14

            meeting of the Company or he/she resigns or dies. Members of the
            management board of the Company may be re-elected. Vacancies shall
            be filled as soon as possible.

     (c)    The management board of the Company shall meet or shall be consulted
            as often as the interest of the Company so requires. The management
            board shall meet or be consulted at the invitation of its chairman
            or of any of its members at the registered office of the Company or,
            if the management board is convened by its chairman, at any other
            place indicated in the invitation. The invitation may be made by any
            means, even orally. The meeting may take place either physically in
            France or abroad or by any means of communication allowing an
            instant debate among the members of the management board (e.g.,
            video conference, conference call...).

            Resolutions may be taken if a quorum is met. A quorum shall exist if
            at least half of all the members of the management board
            participate, provided that in any case at least two members of the
            management board must participate in the resolution. The resolutions
            of the management board may be achieved by correspondence,
            telephone, telecopy, telex, Internet or by any other means.

            Resolutions of the management board shall be taken by a majority of
            the members present or represented at the relevant meeting. The
            chairman of the management board shall not have a casting vote.

            Any member of the management board may vote by proxy by giving a
            power of attorney to another member of the management board;
            provided, however, that at any one meeting of the management board,
            --------  -------
            a member of the management board participating in such meeting may
            only carry one proxy.

            The decisions of the management board shall be stated in minutes
            signed by the chairman of the management board or, if the chairman
            did not attend the meeting, by two members of the management board.
            The minutes of the management board are recorded in chronological
            order in a register numbered and initialed.

            The working language of the management board shall be English,
            unless otherwise required by mandatory law, in which case an English
            language translation shall be provided simultaneously.

     5.4.2  Powers of the Management Board
            ------------------------------

            The management board shall have the broadest powers to act in all
            circumstances on behalf of the Company, provided that such actions
            fall within the definition of the corporate purpose of the Company
            as described in the articles of incorporation, and subject to the
            powers granted to the supervisory board and the shareholders'
            meetings.
<PAGE>

                                       15

     5.4.3  Intragroup Transactions
            -----------------------

     (a)    Aventis will provide to the Company services including services from
            the finance, controlling, legal, insurance, tax, HR, communication,
            IT strategy and pension functions. All such services (like all other
            agreements entered into between Aventis and the Company or its
            subsidiaries) will be at arm's length terms and conditions. For such
            services Aventis will charge the Company a fee of Euro 24 (twenty-
            four) million for the year 2000. This amount includes projects as
            well as consultants' and lawyers' fees and other out-of-pocket
            expenses borne by Aventis. A brief summary report of the costs of
            the services as billed to the Company pursuant to this section
            5.4.3(a) will be provided on an annual basis to the audit committee
            of the supervisory board.

     (b)    Adjustments to this amount for the subsequent years, if any, shall
            reflect both inflation and rationalization in rendering the services
            by Aventis and will in each case require the consent of Schering,
            which shall not be unreasonably withheld or delayed.

     (c)    Aventis will not charge additional fees in consideration of the
            purchasing advantage that the Company may benefit from the Company's
            suppliers of goods and services due to the fact that the Company
            belongs to the Aventis group.

     (d)    The Company may use in its worldwide business the Aventis name in
            accordance with the Aventis communication policy, without additional
            compensation.

ARTICLE VI - MINORITY PROTECTION

6.1  Information
     -----------

     All of the representatives on the Company's supervisory board, including
     the representatives of the Schering Group, and in board committees, if any,
     will be provided with all information necessary for their representation.
     In addition, the representatives of the Schering Group will be provided
     with the same information at the same time as that given to other
     supervisory board or committee members acting in their capacity as such.

6.2  Decisions Requiring the Consent of the Schering Parties
     -------------------------------------------------------

     Notwithstanding the rights of the Schering Parties under applicable
     corporate laws, only the following resolutions of the Company will require
     the consent of the Schering Parties, which shall not be unreasonably
     withheld:

     (i)   change in the articles of association of the Company, except as
           provided in section 6.3 hereof;
     (ii)  change of corporate form.
<PAGE>

                                       16

6.3  Capital Increase
     ----------------

     The Hoechst Parties and the Aventis Parties shall have the right to
     increase the share capital of the Company, unless the Schering Parties
     demonstrate that such increase is not intended for financing capital
     expenditures or investments.  The Schering Parties will not be required but
     will have the opportunity to participate in such capital increases of the
     Company in order to maintain their level of ownership.  Capital increases
     will be effected at fair market value as determined, if necessary, by a
     jointly appointed expert.

6.4  Dividends
     ---------

     Legally distributable profits of the Company group will be distributed
     unless needed to maintain the initial ratio of equity to balance sheet
     total.  The shareholders of the Company will, on an annual basis, hold good
     faith discussions on the appropriate dividend policy in light of the
     Company's capital requirements.

6.5  Financial Statements
     --------------------

     The financial statements (year-end and quarterly) of the Company will be
     prepared in accordance with US GAAP or French GAAP, depending on the
     accounting of Aventis.  In case of an adoption of French GAAP, the Company
     will, to the extent required to avoid having an amount of profit and equity
     available for dividends that is below the amount that would have resulted
     under US GAAP, exercise all optional accounting and valuation rules
     available under French GAAP so as to produce results as close as possible
     to those produced under US GAAP, and will provide Aventis and Schering with
     the information required for a reconciliation to US GAAP.

ARTICLE VII - RESTRUCTURING

7.1  The Parties agree to cause the Company to integrate the business of AgrEvo
     and RP Agro in order to realize the greatest possible synergies (e.g.
     global headquarters).  Aventis and Hoechst shall ensure that Schering
     receives information on the restructuring plans and has the possibility to
     provide its input.  Schering will further have a right to veto any
     restructuring that could affect the tax-free transfer of Schering's shares
     in AgrEvo GmbH to the Company, in particular a relocation outside Germany
     of AgrEvo GmbH's registered office (Firmensitz), a post Closing transfer of
     AgrEvo GmbH shares and a merger or the liquidation of AgrEvo GmbH.  In
     addition, Schering's consent shall be required (which shall not be
     unreasonably withheld) for (i) a post Closing liquidation or selection of
     merger structure of the Company and (ii) within a period of 24 (twenty-
     four) months after Closing, any restructuring that would invalidate the
     tax-free nature of NOR-AM Chemical Company's contribution of its stake in
     AgrEvo US to the Company, provided such action under (i) or (ii) would
     severely affect Schering's tax position.

7.2  The Parties shall cause the Company to indemnify Schering against any costs
     and expenses caused by former Schering employees which Schering might incur
     as a
<PAGE>

                                       17

     consequence of rationalizing the AgrEvo headquarters in Berlin, up to an
     aggregate maximum of DM 12 (twelve) million (the "Cap"). In case Schering
     intends to settle any valid claims of former Schering employees against it
     in the pre-trial period and intends to make a claim of indemnification
     against the Company as a part of the Cap, Schering shall not finalize such
     settlement without the Company's prior consent which shall not be
     unreasonably withheld. Under the condition that no claim for
     indemnification has been made against the Company pursuant to this Section
     7.2, Schering shall have the right but not the obligation to release the
     Company from such indemnity within 1 (one) year from Closing against
     payment of DM 1 (one) million by the Company.

ARTICLE VIII - RESEARCH COOPERATION

8.1  Consistent with the existing research cooperation between Schering and
     AgrEvo, a research cooperation between Schering and the Company shall be
     established which -- subject to pre-existing contractual obligations vis-a-
     vis third parties or one of the Parties -- shall provide for a mutual
     exchange of compounds, libraries and screening possibilities (together the
     "Compounds").  It is the understanding of the Parties that Schering shall
     grant to the Company the right of testing the Compounds of Schering and its
     controlled entities (the "Schering Compounds") for a period of 15 (fifteen)
     months beginning with the receipt of the Compounds.  This also includes the
     right for the Company to provide the respective legal entities owning the
     animal health and nutrition businesses of the Aventis group and the Hoechst
     group (together, the "Aventis Animal Health Businesses") with the Schering
     Compounds.  After expiration of this period, the Company shall have a
     period of 60 (sixty) days to exercise its rights for an exclusive,
     worldwide, irrevocable license with the right to sublicense to Affiliates
     for Schering Compounds in the fields of business of the Company and the
     Aventis Animal Health Businesses.

8.2  The Parties further agree that the respective legal entity(ies) owning the
     human pharma business of the Aventis group and the Hoechst group (together,
     the "Aventis Pharma Business") shall have a right of first testing the
     Compounds of the Company and its controlled entities (the "Company's
     Compounds") for a limited period of 9 (nine) months beginning with the
     receipt of the Company's Compounds.  After expiration of this period, the
     Aventis Pharma Business shall have a period of 60 (sixty) days to exercise
     its rights for an exclusive, worldwide, irrevocable license with a right to
     sublicense to Affiliates for the Company's Compounds in the human
     pharmaceutical business.

8.3  With regard to all the Company's Compounds for which this right is not
     exercised within the above mentioned 60 (sixty) day period, the Company is
     obliged to grant to Schering the right of testing the Company's Compounds
     for its human pharmaceutical business for a limited period of 15 (fifteen)
     months beginning with the receipt of the Compounds. After expiration of
     this period, Schering shall have a period of 60 (sixty) days to exercise
     its rights for an exclusive, worldwide, irrevocable license with the right
     to sublicense to Affiliates for the Company's Compounds in Schering's human
     pharmaceutical business.
<PAGE>

                                       18

     In case Schering does not exercise its rights, the Company is free to
     dispose of these Compounds.

8.4  Notwithstanding the foregoing, the Parties agree that the Compounds can be
     kept for future testing provided, however, that no right to license the
     Compounds for any use is granted hereby.  The proprietary or license rights
     of Schering and the Company relating to any Compounds provided hereunder
     will be respected.

8.5  Any license right mentioned in this Article VIII will be at market
     conditions.

8.6  The Parties shall use reasonable efforts to negotiate research cooperation
     agreements embodying the provisions set forth in this Article VIII as soon
     as reasonably possible.  For the avoidance of doubt, the Parties
     acknowledge and agree that pending the execution of these research
     cooperation agreements, the provisions set forth in this Article VIII shall
     govern and apply to their research cooperation.

8.7  The Parties acknowledge and agree that the research cooperation
     arrangements set forth in this Article VIII and in the research cooperation
     agreements to be entered into in accordance with the provisions of this
     Article VIII may be terminated by any Party if (i) neither the Aventis
     Group nor the Hoechst Group holds Shares in the Company, or (ii) the
     Schering Group ceases to hold any Shares in the Company.

ARTICLE IX - TRANSFER OF SHARES

9.1  (a)  Until December 31, 2003, no Party shall be entitled to transfer in any
          manner its Shares in the Company to a third party.  In addition, no
          Party shall be entitled at any time to pledge all or part of its
          Shares in the Company.  Notwithstanding the foregoing, for purposes of
          this Article IX, a transfer of Shares (i) between a Hoechst Party and
          an Aventis Party or (ii) by the direct or indirect Wholly Owned
          Affiliates of the Principals holding Shares in the Company to their
          respective parent companies or to direct or indirect Wholly Owned
          Affiliates of the Principals shall not be considered as a transfer to
          a third party; provided, however, that any such transfer shall only be
                         --------  -------
          made and effective on the condition that such transferee shall have
          agreed in writing prior to the consummation of the contemplated
          transfer to become a party to this agreement and assume and be bound
          by all of the obligations of the transferor under this agreement.

     (b)  Should any member of the Hoechst Group, the Aventis Group or the
          Schering Group, as the case may be (the "Selling Partner(s)") want to
          transfer all or part of its Shares in the Company to a third party at
          any time during the term of this agreement after December 31, 2003,
          the other Group(s) (the "Other Partner(s)") shall have a preemptive
          right (Vorkaufsrecht) for such Shares in the Company of the Selling
          Partner(s).  In case a Schering Party is the Selling Partner to a
          third party, Hoechst and Aventis or any of their direct or indirect
          Wholly Owned Affiliates shall be entitled to acquire all, but no less
          than all, such offered Shares
<PAGE>

                                       19

          in the Company from the relevant Schering Party(ies). In case a
          Hoechst Party and/or an Aventis Party are/is the Selling Partner(s) to
          a third party, Schering or any of its direct or indirect Wholly Owned
          Affiliates shall be entitled to acquire all, but no less than all,
          such offered Shares in the Company from the relevant Hoechst
          Party(ies) and/or Aventis Party(ies). In any event, the Selling
          Partner(s) shall invite the Other Partner(s) to join in the sales
          process at the sole discretion of said Other Partner(s).

          The preemptive right referred to above shall be implemented as
          follows:

          (i)   The Selling Partner(s) shall promptly notify the Other
                Partner(s) in writing of its/their intention to transfer all or
                part of its/their Shares in the Company. Such notification shall
                include the number of Shares intended to be offered for sale.

          (ii)  After complying with its notification obligation described in
                clause (i) immediately above, a Selling Partner(s) may negotiate
                a bona fide offer (the "Offer") from any third party (the "Bona
                Fide Purchaser") to purchase all or part of the Selling
                Partner's Shares in the Company, provided, however, that in the
                                                 --------  -------
                event such bona fide offer includes Non-Cash Consideration (as
                defined below), the Selling Partner(s) shall, as a condition of
                validity of such bona fide offer, include in the agreement with
                the Bona Fide Purchaser a provision whereby the Bona Fide
                Purchaser shall have the obligation, if necessary, to provide
                complete access to all relevant books, documents and corporate
                records to the investment bankers appointed in order to
                determine the fair market value of the offer. In the event that
                the Selling Partner(s) has/have negotiated an Offer from a Bona
                Fide Purchaser, the Selling Partner(s) shall promptly, and no
                later than twenty (20) days after the execution of the relevant
                agreement with the Bona Fide Purchaser, deliver a written notice
                (the "Offer Notice") of the Offer to the Other Partner(s),
                indicating the name of the Bona Fide Purchaser, the identities
                of the persons or entities that ultimately control the Bona Fide
                Purchaser, the Offer price, including the amount and kind of
                consideration proposed to be paid with respect to such transfer
                (the "Offer Price") and including a certified copy of all of the
                agreements entered into with the Bona Fide Purchaser relating to
                the Offer. The delivery of the Offer Notice by the Selling
                Partner(s) to the Other Partner(s) shall constitute an offer to
                sell the relevant Shares at the Offer Price and on terms and
                conditions identical to those specified in the Offer Notice
                (subject to any changes necessary in order to allow the
                replacement of Non-Cash Consideration, as defined in paragraph
                (iv) below, with cash, pursuant to paragraph (iv) below).

          (iii) Upon receipt of an Offer Notice, the Other Partner(s) shall have
                the right to acquire all of the Shares offered by the Selling
                Partner(s) at a price equal to the Offer Price and on terms and
                conditions identical to those
<PAGE>

                                       20

                specified in the Offer Notice (subject to any changes necessary
                in order to allow the replacement of Non-Cash Consideration, as
                defined in paragraph (iv) below, with cash, pursuant to
                paragraph (iv) below). The Selling Partner(s) shall be
                irrevocably bound to transfer all of the relevant Shares to the
                Other Partner(s), at the Offer Price, and on terms and
                conditions identical to those specified in the Offer Notice
                (subject to any changes necessary in order to allow the
                replacement of Non-Cash Consideration, as defined in paragraph
                (iv) below, with cash, pursuant to paragraph (iv) below) in the
                event the Other Partner(s) decide to exercise such right. In
                order to exercise the right described in this sub-section (iii),
                the Other Partner(s) must notify the Selling Partner(s) in
                writing of its/their election (a "Notice of Election") to
                exercise such right within 60 days after receipt of the Offer
                Notice. For purposes of this clause (iii), the "Transferring
                Period" shall be defined as the period ending 90 days after the
                end of the 60-day period referred to in the immediately
                preceding sentence, or such larger period (up to 270 days in the
                aggregate) as is required by the necessity of obtaining any
                material approval or consent from the public authority before
                proceding with the transfer of the Company Shares offered by the
                Selling Partner(s), to the extent that (and only for the
                additional period during which) such approval or consent has not
                been obtained for any reason other than the failure by the
                Selling Partner(s) or by the Bona Fide Purchaser to diligently
                attempt to obtain such consent or approval.

                If the Other Partner(s) do not elect to exercise its/their right
                by delivery of a Notice of Election within such 60-day period,
                (x) the Selling Partner(s) may transfer the Company Shares
                offered within the Transferring Period to the Bona Fide
                Purchaser for the Offer Price and on the terms and conditions
                set forth in the Offer Notice, and (y) the Other Partner(s)
                shall be deemed to have irrevocably consented, for purposes of
                Section 9.1 hereof, to such transfer.

                In the event that the transfer to the Bona Fide Purchaser
                pursuant to the Offer as set forth in the Offer Notice is not
                concluded within the Transferring Period for any reason, the
                Selling Partner(s) may not transfer its/their Shares except by
                submitting another Offer and complying with the provisions set
                forth in this Section 9.1.

          (iv)  In the event the Offer Price specified in the Offer Notice
                includes any property or other consideration other than cash
                (including notes or other evidence of indebtedness)
                (collectively, "Non-Cash Consideration"), such Offer Price shall
                be deemed to be the sum of the amount of any cash included in
                the Offer Price plus the fair market value of such Non-Cash
                Consideration. The fair market value of such property and other
                consideration (the "Property Value") shall be determined by
                applying the procedure set forth in Section 9.5 below, except
                that the reference date used for the valuation of the Property
                Value shall be the date of receipt of
<PAGE>

                                       21

                the Offer Notice by the Other Partner(s). In case of a Non-Cash
                Consideration, the 60-day period referred to in clause (iii)
                above shall not begin until the final determination of the
                Property Value. Any consideration to be paid by the Other
                Partner(s) to the Selling Partner(s) pursuant to an election to
                exercise its/their right pursuant to clause (iii) above shall
                be, at the option of the Other Partner(s), (x) in cash in an
                amount equal to the sum of the amount of cash and the Property
                Value (as determined above) included in the Offer Price, or (y)
                the Offer Price, including the cash and the Non-Cash
                Consideration components thereof.

     (c)  (i)   The Parties further agree that indirect transfers of Shares of
                the Company (i.e., the consummation of any transaction or series
                of transactions other than a direct transfer of such Shares
                which would result in Shares in the Company being held directly
                or indirectly by an entity which is not a direct or indirect
                Wholly Owned Affiliate of a Principal) shall require the prior
                written consent of all the Principals. For the avoidance of
                doubt, the Parties acknowledge and agree that the consent of
                Schering shall not be required for indirect transfers of Shares
                in the Company if such indirect transfers would result in Shares
                in the Company being held by a direct or indirect Wholly Owned
                Affiliate of Hoechst or Aventis.

          (ii)  Absent an agreement pursuant to the provisions of paragraph
                (c)(i) above, if as a result of a transaction or a series of
                transactions, Shares in the Company are, become or are to be
                held directly or indirectly by an entity which is not a direct
                or indirect Wholly Owned Affiliate of Schering (except for
                members of the Aventis Group and the Hoechst Group), Schering
                shall immediately notify Hoechst and Aventis thereof. Hoechst
                and Aventis or any of their respective direct or indirect Wholly
                Owned Affiliates shall have the right to acquire all, but no
                less than all, the Shares in the Company held by the entity(ies)
                which are not, ceased to be, or will cease to be direct or
                indirect Wholly Owned Affiliates of Schering, at a price equal
                to the fair market value, and such entity(ies) shall be obliged
                to transfer its/their Shares in the Company to Hoechst, Aventis
                or their designated Wholly Owned Affiliates under these
                conditions should they elect to exercise this right. In order to
                exercise this right, Hoechst and/or Aventis must notify Schering
                thereof within 3 (three) months of the receipt of the initial
                notice from Schering to the respective Principal. The fair
                market value referred to in this clause (c)(ii) shall be
                determined in accordance with the provisions set forth in
                Section 9.5, except that the reference date used for the
                valuation of the Shares shall be the date of exercise of the
                option by Hoechst and/or Aventis.

          (iii) Absent an agreement pursuant to the provisions of paragraph
                (c)(i) above, if as a result of a transaction or a series of
                transactions, Shares in the Company are, become or are to be
                held directly or indirectly by an entity which is not a direct
                or indirect Wholly Owned Affiliate of Hoechst or
<PAGE>

                                       22

                Aventis (except for members of the Schering Group), Hoechst
                and/or Aventis shall immediately notify Schering thereof. The
                Schering Parties shall have the right to tender all, but no less
                than all, the Shares in the Company held by them to Hoechst and
                Aventis, at a price equal to the fair market value, and Hoechst
                and Aventis or any of their designated Wholly Owned Affiliates
                shall be obliged to acquire such Shares in the Company under
                these conditions should the Schering Parties elect to exercise
                this right. In order to exercise this right, Schering must
                notify Hoechst and/or Aventis thereof within 3 (three) months of
                the receipt of the initial notice from Hoechst and/or Aventis.
                The fair market value referred to in this clause (c)(iii) shall
                be determined in accordance with the provisions set forth in
                Section 9.5, except that the reference date used for the
                valuation of the Shares shall be the date of exercise of the
                option by Schering.

          (iv)  The Parties shall ensure that the articles of incorporation of
                the Company include a provision reflecting as closely as
                possible the provisions set forth in clauses (ii) and (iii) of
                this paragraph (c).

          (v)   The Parties agree that the provisions set forth in this Section
                9.1(c) shall not be applicable to a change of Control of
                Schering, Hoechst or Aventis, which shall be governed
                exclusively by the provisions set forth in Article X hereof.

9.2  (a)  Notwithstanding anything to the contrary in this agreement, after
          December 31, 2003, the Schering Parties shall be entitled to sell all,
          but not less than all, of their Shares in the Company via an IPO.  If
          the Schering Parties elect to exercise this right, they shall
          forthwith notify Hoechst and Aventis in writing of their decision, in
          which case Hoechst and Aventis or any of their direct or indirect
          Wholly Owned Affiliates shall be entitled to acquire from the Schering
          Parties all, but not less than all, of the Shares in the Company held
          by the Schering Parties at fair market value (call option).  Hoechst
          and Aventis or their Wholly Owned Affiliates shall be entitled to
          exercise this right until the beginning of the bookbuilding process by
          notifying Schering in writing of their decision.  The Schering Parties
          shall be obliged to transfer these Shares to Hoechst and Aventis or
          their relevant Wholly Owned Affiliates under these conditions should
          they elect to exercise this right.  Should neither Hoechst nor Aventis
          exercise this call option, they shall fully support such IPO, in
          particular, by agreeing to a share capital structure of the Company
          which would facilitate a wide shareholder base, i.e., the offering
          price of each share held by the Schering Parties in the Company not
          being greater than Euro 50 (fifty).

     (b)  Notwithstanding anything to the contrary in this agreement, after
          December 31, 2003, the Aventis Parties and the Hoechst Parties shall
          be entitled to sell all or part of their Shares in the Company via an
          IPO.  If the Aventis Parties or the Hoechst Parties elect to exercise
          this right, they shall forthwith notify Schering in writing of their
          decision, in which case Schering or any of its direct or indirect
<PAGE>

                                       23

          Wholly Owned Affiliates shall be entitled to acquire from the Aventis
          Parties or the Hoechst Parties, as the case may be, all, but not less
          than all, of the Shares in the Company offered for sale by the Aventis
          Parties or the Hoechst Parties at fair market value (call option).
          Schering or its Wholly Owned Affiliates shall be entitled to exercise
          this right until the beginning of the bookbuilding process by
          notifying Aventis or Hoechst, as the case may be, in writing of their
          decision.  The Aventis Parties or the Hoechst Parties, as the case may
          be, shall be obliged to transfer these Shares to Schering or its
          relevant Wholly Owned Affiliates under these conditions should they
          elect to exercise this right.  Should Schering not exercise this call
          option, it shall fully support such IPO, in particular, by agreeing to
          a share capital structure of the Company which would facilitate a wide
          shareholder base, i.e., the offering price of each share held by the
          Aventis Parties or the Hoechst Parties in the Company not being
          greater than Euro 50 (fifty).

9.3  After January 1, 2007, the Schering Parties shall be entitled to tender
     all, but no less than all, of their Shares in the Company to Hoechst and
     Aventis for acquisition at fair market value (put option), and Hoechst and
     Aventis or any of their designated Wholly Owned Affiliates shall be obliged
     to purchase such Shares from the Schering Parties under these conditions
     should the Schering Parties elect to exercise this right.  The Schering
     Parties shall also be entitled to tender all, but no less than all, of
     their Shares in the Company to Hoechst and Aventis at fair market value at
     any time, if their aggregate direct or indirect shareholding in the Company
     should fall below 15% (fifteen per cent) as a result of dilution only (put
     option), and Hoechst and Aventis or their designated Wholly Owned
     Affiliates shall be obliged to purchase such Shares from the Schering
     Parties under these conditions should the Schering Parties elect to
     exercise this right.  In both cases, such put option may be exercised by
     the Schering Parties by notifying Hoechst and Aventis with a 3 (three)
     months' notice, provided, however, that Hoechst and Aventis may jointly
                     --------  -------
     defer purchase and transfer of the Shares in the Company held by the
     Schering Parties for up to 12 (twelve) months from the expiration of the
     notice period for reasonable cause, by giving 3 (three) months' notice;
     provided, further, that in the event Hoechst and Aventis do not notify
     --------  -------
     Schering within a maximum of 30 (thirty) days after the receipt of the
     initial notice from Schering stating its election to exercise its put
     option that they wish to defer the purchase and transfer of the Shares,
     they shall be deemed to have irrevocably consented to purchase the relevant
     Shares at the time set forth in Schering's notice.

9.4  After January 1, 2007, Hoechst and Aventis or any of their Wholly Owned
     Affiliates shall be entitled to acquire from the Schering Parties all, but
     no less than all, of the Shares in the Company held by the Schering Parties
     at fair market value (call option), and the Schering Parties shall be
     obliged to transfer these Shares to Hoechst and Aventis or their relevant
     Wholly Owned Affiliates under these conditions should they elect to
     exercise this right.  Such call option may be exercised by Hoechst and
     Aventis by notifying the Schering Parties in writing of their decision with
     a 3 (three) months' notice, provided, however, that the Schering Parties
                                 --------  -------
     may defer the sale and transfer of their Shares in the Company for up to 12
     (twelve) months from the expiration of the notice period due to adverse
     market conditions, by giving 3 (three) months' notice; provided, further,
                                                            --------  -------
     that in the event Schering does not notify Hoechst and/or Aventis within a
     maximum of 30
<PAGE>

                                       24

     (thirty) days after the receipt of the initial notice from Hoechst and/or
     Aventis stating its/their election to exercise its/their call option that
     it wishes to defer the sale and transfer of the Shares, it shall be deemed
     to have irrevocably consented to purchase the relevant Shares at the time
     set forth in Hoechst's or Aventis' notice.

9.5  For the purpose of this Article IX fair market value is the fully
     distributed value at the time the option under 9.2 is exercised or, in the
     case of Sections 9.3 and 9.4, the time of actual transfer of the Shares.
     The fair market value shall be determined by two investment bankers
     appointed by Hoechst and/or Aventis on the one hand and Schering on the
     other hand, using customary valuation methods and giving inter alia
     consideration to the potential of the product pipeline, however, not
     considering a control premium.  Hoechst and/or Aventis, on the one hand,
     and Schering, on the other hand, shall be obliged to appoint their
     respective investment banker as soon as possible, and in no event more than
     20 (twenty) days after an option is notified to be exercised in accordance
     with the provisions of this agreement.  In the event the two investment
     bankers do not agree on the fair market value within 30 (thirty) days after
     the date the last investment banker accepted its appointment, either
     investment banker shall immediately notify the Principals in writing of
     such a disagreement and of the range of values established by the two
     investment bankers, and in no event more than 5 (five) days after the
     expiration of the 30-day period referred to in the previous sentence.
     Promptly upon the receipt of this notice, Hoechst and/or Aventis and
     Schering shall negotiate in good faith to jointly appoint a third
     investment banker.

     In the event that Hoechst and/or Aventis and Schering do not reach an
     agreement on the appointment of such third investment banker within 15
     (fifteen) days after the receipt of the initial notice of disagreement from
     either of the two initial investment bankers, either Hoechst and/or Aventis
     or Schering shall be entitled to apply to the International Center for
     Expertise of the International Chamber of Commerce ("ICC") for the purpose
     of appointing a third investment banker to determine the fair market value.
     The appointment of the third investment banker by the International Center
     for Expertise of the ICC shall be final and binding on the Parties.  The
     third investment banker appointed in accordance with the provisions hereof
     shall be instructed to finally and conclusively determine the fair market
     value within the range of values determined by the two initial investment
     bankers.  The determination of the fair market value by the third
     investment banker shall be final and binding on the Parties.  The
     appointment by the International Center for Expertise of the ICC shall
     apply, mutatis mutandis, if a Party fails to appoint an investment banker
     within the time period provided for herein.

     Each of the Parties agrees to provide full access to all relevant books,
     documents and corporate records to the investment bankers appointed in
     accordance with the provisions hereof for the purpose of determining the
     fair market value.

9.6  Unless otherwise agreed by Hoechst and Aventis, Hoechst and Aventis are
     entitled under this Article IX and obligated under this Article IX pro rata
     based upon their relative direct or indirect participation in the Company.
<PAGE>

                                       25

9.7  Any transfer of the Shares in the Company to a third party shall require
     the approval of the majority of the voting rights in an extraordinary
     shareholders' meeting, and the Parties shall ensure that the bylaws of the
     Company so provide; provided, however, that the Parties agree that they
                         --------  -------
     shall be irrevocably obliged to approve the transfer of the Shares if the
     procedures set forth in this Article IX have been complied with.

ARTICLE X - CHANGE OF CONTROL

10.1 In case of a change of Control of Schering that adversely affects the
     interests of Hoechst, of Aventis or of the Company (in particular if the
     party controlling Schering is competing with the Company), Schering shall
     immediately inform Hoechst and Aventis thereof.  Hoechst and Aventis or any
     of their direct or indirect Wholly Owned Affiliates shall be entitled to
     acquire from the Schering Parties all, but not less than all, of their
     Shares in the Company at fair market value (call option), and the Schering
     Parties shall be obliged to transfer such Shares to Hoechst and Aventis or
     their relevant Wholly Owned Affiliates under these conditions should they
     elect to exercise this right.  In order to exercise this call option,
     Hoechst and Aventis must notify Schering thereof at the latest within 6
     (six) months after the receipt of the notice from Schering informing them
     of the change of Control.  If the call option should be exercised prior to
     January 1, 2007 then the Schering Parties may, subject to applicable law,
     elect to abstain from transferring their Shares in the Company and instead
     implement an appropriate structure to hold separate their voting rights in
     the Company and their rights under Article V and sections 6.1, 6.2 and 6.4
     hereof, provided that any such structure shall be acceptable to Hoechst and
     Aventis and shall ensure that the change of Control of Schering will not
     affect the interests of Hoechst, of Aventis or of the Company.  In such a
     case the Schering Parties shall transfer their Shares in the Company to
     Hoechst and Aventis or their relevant Wholly Owned Affiliates at fair
     market value on January 1, 2007, but in no case earlier than 7 (seven)
     years after Closing.

10.2 In case of a change of Control of Hoechst or Aventis that adversely affects
     the interests of Schering or of the Company (in particular if the party
     controlling Hoechst or Aventis is competing with the Company), Hoechst or
     Aventis shall immediately inform Schering thereof. The Schering Parties
     shall be entitled to tender all, but not less than all, of their Shares in
     the Company to Hoechst and Aventis for acquisition at fair market value
     (put option), and Hoechst and Aventis or any of their relevant Wholly Owned
     Affiliates shall be obliged to purchase such Shares from the Schering
     Parties under these conditions should the Schering Parties elect to
     exercise this right. In order to exercise this put option, Schering must
     notify Hoechst or Aventis thereof at the latest within 6 (six) months after
     the receipt of the notice from Hoechst or Aventis informing it of the
     change of Control.

10.3 For purposes of this Article X, a change of Control with respect to
     Hoechst, Schering or Aventis shall be determined according to the German
     law concept of Control, as referred to in (S) 17 AktG (German Stock
     Corporation Act) or any successor thereof. Fair market
<PAGE>

                                       26

     value shall be determined according to section 9.5 hereof, except that the
     reference date used for the valuation of the Shares shall be the date of
     exercise of the option.

10.4 Unless otherwise agreed by Hoechst and Aventis, Hoechst and Aventis are
     entitled under this Article X and obliged under this Article X pro rata
     based upon their relative participation in the Company.

ARTICLE XI - EFFECTIVENESS - CLOSING

11.1 This agreement shall be effective immediately upon its signature by the
     Parties, with the exception of the provisions set forth in Articles V, VI,
     VII, VIII, IX, X and XII and Sections 14.6 and 14.16 hereof, which shall
     only become effective upon Closing.

11.2 The direct or indirect contribution of Schering's and Hoechst's Shares or
     stakes in AgrEvo GmbH and AgrEvo US and of Aventis' Shares in RP Agro to
     the Company shall be made at closing of this agreement (the "Closing")
     which shall take place on January 1, 2000 or as soon as possible
     thereafter.

11.3 The contribution of Aventis' Shares in RP Agro to the Company shall be made
     exclusive of all rights (coupon detached) to all distributions to be made
     with respect to the 1999 profits of RP Agro, which rights shall remain with
     Aventis or its relevant Affiliate. The contribution of Hoechst's and
     Schering's respective Shares or stakes in AgrEvo GmbH and AgrEvo US to the
     Company shall be made inclusive of all rights (coupon attached) to all
     distributions to be made with respect to the 1999 profits of AgrEvo GmbH
     and AgrEvo US.

11.4 The Parties agree that a dividend of Euro 60 (sixty) million shall be paid
     to Aventis or its relevant Affiliate prior to the Closing in respect of the
     1999 profits of RP Agro.  The Parties further agree that an additional
     equity contribution shall be made by Rhone-Poulenc Sante Vegetale et
     Animale to the Company within 2 (two) months after the Closing, such equity
     contribution to be equal to Euro 60 (sixty) million plus an interest on
     such amount for the period between January 1, 2000 and the actual date of
     contribution at a rate equal to the one-month EURIBOR at January 1, 2000
     (calculated on the basis of a 360-day year) plus 12.5 bp.  The Parties
     agree to take all actions necessary, including by waiving any preferential
     rights which they might otherwise have in connection with such an
     additional equity contribution, so that upon the consummation of such
     contribution the respective shareholding ratios of the Aventis Group, the
     Hoechst Group and the Schering Group in the Company shall be 47.93 %, 28.07
     % and 24.0%.

     The Parties further agree that no dividends shall be distributed prior to
     the Closing in respect of the 1999 profits of AgrEvo.

11.5 (not used)
<PAGE>

                                       27

11.6  Should at the time of scheduled Closing of this agreement any required
      anti-trust clearances be still outstanding, the Parties will establish a
      structure that allows Closing nevertheless. In particular, where
      appropriate the Parties shall use all reasonable efforts to set up a "hold
      separate structure" which may include a transfer of Shares or business
      activities to a third party not objectionable to local government
      authorities.

11.7  The Parties undertake to use their best efforts to obtain any approvals
      for the Closing required by law and to have the conditions precedent
      fulfilled as soon as possible. Each of the Parties is obliged to exercise
      its best efforts to complete the transaction contemplated by this
      agreement and will in particular exchange all information necessary to
      complete the transaction, make and pursue in close cooperation with the
      other Parties all tax filings, anti-trust filings or other filings with
      public authorities, and conclude all further agreements as reasonably
      necessary in order to establish in a timely manner the worldwide agro
      business of the Parties as contemplated by this agreement.

      In the event that a timely achievement of any act or agreement that may be
      necessary for the timely implementation of the transaction contemplated by
      this agreement appears to be unlikely and the Parties do not unanimously
      agree to waive such act or agreement, then the Parties shall use their
      best efforts to negotiate and agree on an alternative solution, which
      provides equivalent levels of legal protection and economic benefits to
      the Parties, so that the requirement can be unanimously waived (such
      waiver not to be unreasonably withheld).

11.8  With regard to requirements by the EU-Commission or any other anti-trust
      authority regarding the divestment of any agro business, this shall not
      hinder the Closing of this agreement and the proceeds from any such
      divestment shall be contributed to the Company in lieu of the asset that
      had to be divested.

11.9  If this agreement has not been closed by October 31, 2000, this agreement
      shall terminate automatically. Sections 2.2, 2.3(i), 11.10, 14.1 through
      14.5, 14.7 through 14.10, 14.12 and 14.13 hereof, however, will survive
      such termination.

11.10 In case that (i) this agreement has not been closed by July 31, 2000 for
      reasons which are beyond Schering's control, (ii) the closing of the
      Exchange Offer has already taken place by that time and (iii) Hoechst and
      Aventis within a further period of 3 (three) months have failed to propose
      an alternative structure which would allow the Closing without material
      and uncompensated legal or economic disadvantages to Schering, then
      Schering shall be entitled to acquire from Hoechst all, but not less than
      all, of its shares in AgrEvo GmbH and its stake in AgrEvo US at fair
      market value (call option), and Hoechst shall be obliged to transfer such
      shares to Schering under these conditions should Schering elect to
      exercise this right. Such call option may only be exercised within a
      period of 3 (three) months, i.e., until January 31, 2001. Should Schering
      not exercise this call option within the given period of time, Hoechst
      shall be entitled to acquire from Schering all, but not less than all, of
      its shares in AgrEvo GmbH and its stake in AgrEvo US at fair market value
      (call option) which may only be exercised within a subsequent period of 3
      (three) months, i.e., until April 30, 2001, and Schering shall be obliged
      to transfer such
<PAGE>

                                       28

      shares to Hoechst under these conditions should Hoechst elect to exercise
      this right. Fair market value shall be determined according to Section 9.5
      hereof, except that a control premium up to 10% (ten percent) - for the
      purpose of such determination taking a joint control of both. Hoechst and
      Schering, in AgrEvo into account -may be considered by the investment
      bankers, if and to the extent deemed appropriate by them.

11.11 If a Party breaches this agreement and as a consequence according to the
      terms of this agreement is entitled to a material benefit, then the
      respective Party shall not be entitled to such benefit. Without
      limitation, this applies to the call options of Schering and Hoechst set
      forth in Section 11.10 hereof.

ARTICLE XII - TERMINATION

12.1  This agreement shall be valid for as long as any Schering Party holds
      Shares in the Company. If the shareholding of the Schering Group should
      fall below 15% (fifteen percent), then the rights of the Schering Group as
      described in the provisions set forth in Article V and Section 6.2 hereof
      shall terminate. If the shareholding of the Schering Group should fall
      below 5% (five percent), then the rights of the Schering Group as
      described in the provisions set forth in Section 6.4 hereof shall also
      terminate. This agreement shall also terminate if neither the Aventis
      Group nor the Hoechst Group holds Shares in the Company.

12.2  In addition, in the event that insolvency, bankruptcy, receivership,
      assignment of assets to creditors, general agreement with creditors or
      similar proceedings are opened or not opened for reason of lack of funds
      with respect to a Party, whether on a voluntary basis or not, the Party
      with respect to which such proceedings are opened or not opened for reason
      of lack of funds (the "Insolvent Party") shall immediately notify the
      other Parties thereof in writing, and the other Parties shall have the
      right to purchase the Shares in the Company of the Insolvent Party at fair
      market value if such situation is not remedied within 2 (two) months. The
      Insolvent Party shall be obliged to transfer its Shares in the Company to
      the other Parties should they elect to exercise this right; provided,
                                                                  --------
      however, that in the event a Hoechst Party is the Insolvent Party, Aventis
      -------
      or any of its direct or indirect Wholly Owned Affiliate shall have
      priority over Schering to acquire all of the Shares in the Company held by
      such Hoechst Party, and in the event an Aventis Party is the Insolvent
      Party, Hoechst or any of its direct or indirect Wholly Owned Affiliates
      shall have priority over Schering to acquire all of the Shares in the
      Company held by such Aventis Party. In the event the non-Insolvent Parties
      elect to exercise the right described in this Section 12.2, they shall
      notify the Insolvent Party in writing of such election within 90 (ninety)
      days after the receipt of the notice from the Insolvent Party informing
      them of the beginning of insolvency proceedings. The fair market value
      referred to in this Section 12.2 shall be determined in accordance with
      the provisions set forth in Section 9.5, except that the reference date to
      be used for the valuation of the Shares shall be the date of exercise of
      their option by the non-Insolvent Parties.
<PAGE>

                                       29

ARTICLE XIII - GUARANTEE OF PERFORMANCE

13.1  Aventis hereby guarantees to each of the Hoechst Parties and the Schering
      Parties the performance of, and compliance with, the relevant agreements,
      covenants and obligations contained in this agreement of any of its
      Affiliates which hold, or in the past held, Shares in the Company.

13.2  Hoechst hereby guarantees to each of the Aventis Parties and the Schering
      Parties the performance of, and compliance with, the relevant agreements,
      covenants and obligations contained in this agreement of any of its
      Affiliates which hold, or in the past held, Shares in the Company.

13.3  Schering hereby guarantees to each of the Hoechst and the Aventis Parties
      the performance of, and compliance with, the relevant agreements,
      covenants and obligations contained in this agreement of any of its
      Affiliates which hold, or in the past held, Shares in the Company.

ARTICLE XIV - MISCELLANEOUS

14.1  Reimbursement of Schering's Costs in case of a Failure to Close
      ---------------------------------------------------------------

      If this agreement should not be closed by October 31, 2000, Schering will,
      upon its request, be reimbursed by Hoechst and Aventis for its reasonable
      expenses hereunder (including reasonable attorney's fees and consultant's
      fees). This right for reimbursement of costs, if exercised, shall be in
      lieu of and not in addition to Schering's rights under Section 11.10
      hereof.

14.2  Expenses
      --------

      Transaction costs, in particular the costs of notarization of this
      agreement shall be borne by the Company. Except as provided for in Section
      14.1 hereof, each Party shall bear the costs of its advisors, including
      attorney's fees. Transfer taxes, if any, shall also be borne by the
      Company.

14.3  Confidentiality and Press Release
      ---------------------------------

      (a) Each Party shall keep secret any and all confidential information that
          is made available to it by the other Parties or by the Company, and
          shall not use this information for purposes other than those provided
          for in the present agreement.  This obligation, however, shall not
          apply to information which (i) was already known to the receiving
          person, (ii) is or becomes publicly available or known through no
          fault of the disclosing or receiving Party, (iii) is disclosed to the
          receiving person by a third party who has the right to disclose such
          information, or (iv) based on the disclosing Party's good faith
          judgment with the advice of legal counsel, is otherwise required by a
          public authority to be disclosed in compliance with applicable laws,
          provided that the disclosing Party shall use
          --------
<PAGE>

                                       30

          reasonable efforts to obtain assurance that confidential treatment
          will be accorded such information, and provided further that such
                                                  -------- -------
          information shall remain confidential for all other purposes unless
          sub-clauses (i) through (iii) immediately above otherwise apply.

     (b)  Public announcements by a Party relating to this transaction, the
          operations of the Company or this agreement other than already made by
          the Company shall require the prior consent of the other Parties,
          unless such announcements are mandatory under applicable law, in which
          case all Parties shall be consulted beforehand to the extent possible.

14.4 Governing Law
     -------------

     This agreement shall be governed by and construed in accordance with the
     laws of France, without regard to its conflict of laws rules.

14.5 Dispute Resolution
     ------------------

     (a)  Any differences, questions or disputes arising in connection with this
          agreement shall be settled by an amicable effort on the part of the
          Principals.  Such effort shall be referred to the chief executive
          officers of the Principals if no agreement has been achieved within
          two weeks from the date the first request for an amicable settlement
          is raised by one of the Parties.  The effort shall be considered to
          have failed if within two weeks after reference to the chief executive
          officers, the Parties have not resolved the matter amicably.

     (b)  Any dispute, controversy or claim arising out of or relating to this
          agreement, or the breach, termination or invalidity thereof which has
          not been resolved amicably pursuant to the provisions of Section
          14.5(a) shall be finally settled by arbitration in accordance with the
          UNCITRAL Arbitration Rules by 3 (three) arbitrators, without recourse
          to the ordinary courts of law.  The place of arbitration shall be in
          Geneva, and the language of the arbitration shall be English.

          The arbitral tribunal shall also be authorized to issue interim
          measures and injunctive relief.  For this purpose, the Parties shall,
          however, also have access to any competent ordinary court of law.
<PAGE>

                                       31

14.6 Entire Agreement-Termination of Prior Agreements
     ------------------------------------------------

     (a)  This agreement constitutes the full understanding of the Parties and a
          complete and exclusive statement of the terms and conditions of the
          agreement relating to the subject matter hereof (other than the
          separate agreement entered into between Aventis and Hoechst on the
          date hereof) and merges, cancels and supersedes all prior memoranda of
          intent, memoranda of terms, and other documents heretofore executed by
          or exchanged, circulated or discussed between the Parties with respect
          to the subject matter hereof, except as set forth in Section
          14.6(b)(ii) below.

     (b)  (i)  For the avoidance of doubt, the Parties hereby agree that this
               agreement supersedes and replaces the Agro Business Combination
               Agreement of March 3, 1999, notarial deed A. Prot 1999/25 of the
               notary public Stephan Cueni, Basel, Switzerland, and the Agro
               Business Combination Agreement of June 23, 1999, notarial deed A.
               Prot 1999/119 of the notary public Stephan Cueni, Basel,
               Switzerland.

          (ii) Furthermore, this agreement supersedes and replaces (x) the
               AgrEvo Agreement, (y) the Basisvertrag and the Personalvertrag,
               both dated November 25, 1993 between Schering and Hoechst, and
               all other agreements related to their joint venture in the field
               of crop protection, and (z) the U.S. Partnership Agreement dated
               as of January 1, 1994 related to Hoechst's and Schering's joint
               venture in the field of crop protection, which agreements shall
               terminate as of Closing; provided, however, that Sections 10 and
                                        --------  -------
               11 of the Basisvertrag shall survive such termination.

               In addition, notwithstanding the foregoing, Schering and Hoechst
               agree that the indemnification and other obligations undertaken
               by NOR-AM Chemical Company or AgriVet Inc., as the case may be,
               under Articles VII and IX of the U.S. Partnership Agreement,
               under Section 3.02 and Article IX of the Asset Transfer Agreement
               dated as of January 1, 1994 between AgriVet Inc. and AgrEvo US,
               and under Section 3.02 and Article IX of the Asset Transfer
               Agreement dated as of January 1, 1994 between NOR-AM Chemical
               Company and AgrEvo US shall not be, or deemed to be, transferred,
               terminated or modified by any of the transactions contemplated
               hereby, including, without limitation, the termination of the
               U.S. Partnership Agreement, the dissolution of AgrEvo US and the
               transfer of assets and liabilities of AgrEvo US to any successor
               company, provided, however, that in no case NOR-AM Chemical
                        ------------------
               Company shall have any liability in connection with, or from
               having acted as, a general partner in AgrEvo US.  Schering agrees
               that it will ensure that NOR-AM Chemical Company will perform
               such indemnification and other obligations of NOR-AM Chemical
               Company, as if references in such agreements to the Partnership
               or AgriVet Inc. were references to any such
<PAGE>

                                       32

               successor company. Hoechst agrees that it will ensure that one of
               its Affiliates (other than the Company or any of its
               subsidiaries) will perform such indemnification and other
               obligations of AgriVet Inc., as if references in such agreements
               to the Partnership or NOR-AM Chemical Company were references to
               any such successor company. Both Schering and Hoechst confirm
               that they have been handed over copies of the three agreements
               referred to in this paragraph and that they are aware of the
               obligations contained therein.

      (c) Hoechst and Schering shall take all necessary actions to terminate the
          current Articles of AgrEvo GmbH, which shall be replaced with Articles
          consistent with the arrangements contemplated by this agreement.

14.7  No Rescission
      -------------

      The Parties are not entitled to rescind this agreement for any reason
      whatsoever, other than reasons related to public policy matters (ordre
      public).

14.8  Assignment
      ----------

      The assignment by a Party of this agreement or of any rights and
      obligations under this agreement shall require the prior written consent
      of the other Parties.

14.9  Severability
      ------------

      In the event that a provision of the present agreement becomes or is held
      invalid, illegal or unenforceable in any respect, then as a replacement
      for the invalid, illegal or unenforceable provision, the Parties shall
      endeavor to work out and implement an agreement whose financial economic
      and legal effect comes as close as possible to that of the invalid,
      illegal or unenforceable provision. Even if this should not be achieved,
      the invalidity, illegality or unenforceability of the relevant provision
      shall not affect the validity, legality and enforceability of the
      remaining provisions, unless the absence of the invalidated provision
      would have caused the Parties not to sign this agreement.

14.10 Headings
      --------

      Article and Section headings and the Table of Contents used herein are for
      convenience of reference only, are deemed not to be part of this agreement
      and are not to affect the construction of, or to be taken into
      consideration in interpreting, this agreement.

14.11 (not used)
      ----------

14.12 Force Majeure
      -------------

      Insofar as and as long as a Party should be prevented from fulfilling its
      obligations for reasons of force majeure, which, for purposes of this
      agreement, shall be defined as
<PAGE>

                                       33

       events which could not be predicted and prevented, even with the extreme
       caution that can reasonably be expected of a prudent businessman, and
       which cannot be overcome then such Party shall be released from this
       fulfilment. The relevant Party shall immediately inform the other Parties
       of the circumstances of the force majeure and shall use its best efforts
       to remedy these circumstances. Insofar as necessary and feasible, the
       Parties shall negotiate any adaptation measures rendered necessary should
       the force majeure circumstances be continuing.

14.13  Waiver - Amendment
       ------------------

       No provision of this agreement may be waived except by a writing signed
       by the Party entitled to the benefit thereof, and no such waiver of any
       provision hereof in one instance shall constitute a waiver of any other
       provision or of such provision in any other instance. No omission, delay
       or failure on the part of any Party in exercising any rights hereunder
       will constitute a waiver of such rights or of any other rights hereunder.
       Neither this agreement nor any provision hereof may be waived, amended or
       modified except pursuant to an agreement or agreements in writing entered
       into by each Party, which instrument shall specifically indicate that it
       is the desire of the Parties to waive, amend or modify this agreement.

14.14  Consequences of a Delayed Closing
       ---------------------------------

       Dates given in this agreement are based on the assumption that the
       Closing of this agreement will occur on January 1, 2000. If this Closing
       should be delayed, the dates contained in Articles IX and X of this
       Agreement will change accordingly.

14.15  Notices
       -------

       For purposes of this agreement, a notice to be made to any Party shall be
       made in writing and shall be delivered by fax, by registered mail, by
       hand or by overnight courier service to the relevant Party. In addition,
       a notice from a Principal shall be deemed to be made on behalf of the
       other Parties of the Group of which such Principal is a member.

14.16  Non-Competition Covenant
       ------------------------

(a)    Except as otherwise set forth in this Section 14.16, during the term of
       this agreement, aside from its interest in the Company, no Principal, be
       it itself or through any of its direct or indirect subsidiaries, shall
       sell, supply for use, license or conduct research and development
       activities specifically for products or services included in the Field of
       Activity of the Company (as defined in Section 14.16(e) below), except
       for services and performances on behalf of the Company according to this
       agreement or any intragroup agreement.

(b)    The Parties agree that the provisions of Section 14.16 (a) shall not
       apply to:
<PAGE>

                                       34

      (i)   the toll manufacturing for a third party by Aventis, Hoechst or
            Schering or any Affiliate or successor thereof pursuant to customary
            toll manufacturing arrangements of bulk or formulated products
            identical or similar to those manufactured, sold, licensed or
            supplied for use by the Company;

     (ii)   any license, authorization or other grant of a right by Aventis,
            Hoechst or Schering or any Affiliate or successor thereof, which
            license, authorization or other grant of a right is (x) first
            offered to the Company, together with information reasonably
            sufficient for the Company to consider such offer, and (y) not
            accepted in writing by the Company within 3 (three) months after
            such offer is made; provided that the terms and conditions offered
            to the relevant third party shall not be more favorable to such
            third party than those offered to and not accepted by the Company;

     (iii)  the manufacture, sale or supply for use of, or the license or
            authorization of (or other grant of a right to) a third party by
            Aventis, Hoechst or Schering or any Affiliate or successor thereof
            in respect of a product the application of which is intended to be
            outside the scope of the Field of Activity of the Company.

(c)  The prohibition to compete described in Section 14.16(a) above shall not
     prohibit any Principal and/or any direct or indirect subsidiary thereof
     (the "Acquiring Party") from acquiring businesses or companies engaged in
     activities which are covered by the prohibition to compete described in
     Section 14.16(a) above, but only to the extent that such activities do not
     represent more than 50% (fifty percent) of the annual consolidated sales of
     the acquired businesses or companies, or from being acquired by, or merging
     with businesses or companies engaged in activities covered by the
     prohibition to compete described in Section 14.16(a) above; provided,
                                                                 --------
     however, that in the event that the businesses or activities acquired by
     -------
     the Acquiring Party and covered by the prohibition to compete amount to
     more than Euro 1 (one) million in annual consolidated sales, the Acquiring
     Party shall, or shall cause its relevant subsidiary to, offer in writing
     (the "Notification") such businesses or activities for sale to the Company
     at a price to be equal to the fair market value of such businesses or
     activities (as determined pursuant to the following paragraph) within six
     months after the date of completion of the acquisition, to the extent that
     (i) the level of control acquired by the Acquiring Party over such
     businesses or activities allows it to do so under the applicable corporate
     governance principles, and (ii) it may freely do so under applicable laws
     and/or pre-existing contractual obligations (i.e., obligations other than
     those negotiated in the context of the relevant transaction).
<PAGE>

                                       35

     Promptly after the Notification, the fair market value of the businesses or
     activities offered shall be determined by an investment bank appointed
     jointly by the Acquiring Party and the Company.  If the Acquiring Party and
     the Company do not reach an agreement on the appointment of a single
     investment bank within 15 (fifteen) days after the date of the
     Notification, the fair market value of the relevant businesses or
     activities shall be determined by three investment banks, whose appointment
     shall be made in accordance with the principles set forth in Section 9.5
     hereof.  The determination of the fair market value of the relevant
     businesses or activities shall be made in accordance with the principles
     set forth in Section 9.5 hereof, except that the reference date for the
     valuation of the relevant businesses or activities shall be the date of the
     Notification.  The fees of the investment banks so appointed shall be
     shared in half by the Acquiring Party and the Company, unless the Company
     notifies in writing its intention not to acquire the relevant businesses or
     activities within three months after the date of final determination of the
     fair market value of the relevant businesses or activities or fails to
     notify in writing its intention to acquire the relevant businesses or
     activities within three months after the date of final determination of the
     fair market value, in which cases the fees of the investment banks shall be
     borne by the Acquiring Party.  Should the Company notify in writing its
     intention not to acquire the relevant businesses or activities within
     three-month after the date of final determination of the fair market value
     of the relevant businesses or activities or fails to notify in writing its
     intention to acquire the relevant businesses or activities within three
     months after the date of final determination of the fair market value, or
     should the Acquiring Party and the Company fail to reach a final agreement
     on the terms and conditions of a sale of the relevant activities or
     businesses within three months after the date of the final determination of
     the fair market value of the relevant businesses or activities, the
     Acquiring Party shall, or shall cause its relevant subsidiary to, use
     reasonable efforts to sell such businesses or activities within a
     reasonable period of time, including by actively marketing the relevant
     activities at a price equal to the fair market value as determined in this
     paragraph and on such other terms as are reasonably likely to result in a
     sale.  The Parties agree that a failure by the Acquiring Party to sell the
     relevant businesses or activities within a reasonable period of time after
     using reasonable efforts shall not result in a breach of the prohibition to
     compete described in Section 14.16(a) above.  The Parties further agree
     that the survival of certain supply, license or other relationships between
     the Acquiring Party and/or its Affiliates and the divested businesses or
     activities for legitimate antitrust, intellectual property or other reasons
     shall not be deemed to be a breach of the non-competition covenant set
     forth in Section 14.16(a) above.

(d)  Notwithstanding anything in this Section 14.16 to the contrary, the Aventis
     Group and the Hoechst Group shall cease to be bound by the non-competition
     covenant set forth in Section 14.16(a) above if the shareholding of the
     Schering Group in the Company shall fall below 15% (fifteen percent).
     Similarly, notwithstanding anything in this Section 14.16 to the contrary,
     the Schering Group shall cease to be bound by the non-competition covenant
     set forth in Section 14.16(a) above if the aggregate shareholding of
     Aventis Group and the Hoechst Group in the Company shall fall below 15%
     (fifteen percent).
<PAGE>

                                       36

(e)  For purposes of this Section 14.16, the phrase "Field of Activity of the
     Company" shall mean research, development, production and distribution, all
     as done by the Company as of the date of Closing (i) of products, processes
     and services to prevent damage to plants and harvested crops caused by
     insects, weeds, fungi, bacteria, viruses or other harmful organisms, for
     applications in agriculture, forestry and horticulture and for use in
     households and industry, for hygiene, for protection of inventories and
     materials (also including genetic engineering methods and seeds), (ii) of
     insecticides, rodenticides, herbicides, fungicides and similar products for
     use in households and industry, for hygiene, for protection of inventories
     and materials (also including genetic engineering methods and seeds), (iii)
     of special and liquid fertilizers of all types, and (iv) of plant growth
     regulators.  For the avoidance of doubt, the Parties agree that activities
     related to animal health shall not be deemed to be included in the Field of
     Activity of the Company.  The Parties agree that should the scope of the
     activities of the Company change significantly from the Field of Activity,
     the Parties shall negotiate in good faith in order to decide what
     amendments, if any, should be made to the definition of Field of Activity
     of the Company set forth in this paragraph.

IN WITNESS THEREOF this Notarial Deed has been read aloud to the persons
appearing and was confirmed and approved by the persons appearing. The persons
appearing then signed this Deed. All this was done at the day herebelow written
in the presence of me, the Notary Public, who also signed this Deed and affixed
my official Seal.

Basel, this 29th (twenty-ninth) day of December 1999 (nineteen hundred and
ninety-nine)
                                              (1) ______________________________

                                              (2) ______________________________

                                              (3) ______________________________

                                       The Notary ______________________________

<PAGE>

                                       1

<TABLE>
<CAPTION>
                               TABLE OF CONTENTS
<S>                                                                                         <C>
ARTICLE I - CERTAIN DEFINITIONS................................................              5
ARTICLE II - BUSINESS COMBINATION..............................................              6
ARTICLE III - CONTRIBUTIONS TO THE COMPANY.....................................              7
     3.1  Contributions of the Aventis Parties.................................              7
          ------------------------------------
     3.2  Contributions of Hoechst.............................................              8
          ------------------------
     3.3  Contributions of the Schering Parties................................              8
          -------------------------------------
ARTICLE IV - SHAREHOLDING......................................................              8
ARTICLE V - GOVERNANCE OF THE COMPANY..........................................              9
     5.1  Corporate Bodies of the Company......................................              9
          -------------------------------
     5.2  Shareholders' Meeting................................................              9
          ---------------------
     5.3  Supervisory Board (Conseil de surveillance)..........................              9
          -------------------------------------------
        5.3.1  Composition and Meetings of the Supervisory Board...............              9
               -------------------------------------------------
        5.3.2  Powers of the supervisory board.................................             12
               -------------------------------
     5.4  Management Board (Directoire)........................................             13
          -----------------------------
        5.4.1  Composition and Meetings of the Management Board................             13
               ------------------------------------------------
        5.4.2  Powers of the Management Board..................................             14
               ------------------------------
        5.4.3  Intragroup Transactions.........................................             15
               -----------------------
ARTICLE VI - MINORITY PROTECTION...............................................             15
     6.1  Information..........................................................             15
          -----------
     6.2  Decisions Requiring the Consent of the Schering Parties..............             15
          -------------------------------------------------------
     6.3  Capital Increase.....................................................             16
          ----------------
     6.4  Dividends............................................................             16
          ---------
     6.5  Financial Statements.................................................             16
          --------------------
ARTICLE VII - RESTRUCTURING....................................................             16
ARTICLE VIII - RESEARCH COOPERATION............................................             17
ARTICLE IX - TRANSFER OF SHARES................................................             18
ARTICLE X - CHANGE OF CONTROL..................................................             25
ARTICLE XI - EFFECTIVENESS - CLOSING...........................................             26
ARTICLE XII - TERMINATION......................................................             28
ARTICLE XIII - GUARANTEE OF PERFORMANCE........................................             29
ARTICLE XIV - MISCELLANEOUS....................................................             29
     14.1   Reimbursement of Schering's Costs in case of a Failure to Close....             29
            ---------------------------------------------------------------
     14.2   Expenses...........................................................             29
            --------
     14.3   Confidentiality and Press Release..................................             29
            ---------------------------------
     14.4   Governing Law......................................................             30
            -------------
     14.5.  Dispute Resolution.................................................             30
            ------------------
     14.6   Entire Agreement - Termination of Prior Agreements.................             31
            --------------------------------------------------
     14.7   No Rescission......................................................             32
            -------------
     14.8   Assignment.........................................................             32
            ----------
     14.9   Severability.......................................................             32
            ------------
     14.10  Headings...........................................................             32
            --------
     14.11  (not used).........................................................             32
            ----------
     14.12  Force Majeure......................................................             32
            -------------
     14.13  Waiver - Amendment.................................................             33
            ------------------
     14.14  Consequences of a Delayed Closing..................................             33
            ---------------------------------
</TABLE>
<PAGE>

                                       2
<TABLE>
<S>                                                                                         <C>
14.15  Notices...................................................................           33
       -------
14.16  Non-Competition Covenant..................................................           33
       ------------------------
</TABLE>

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