TRANSLATION FROM FRENCH FOR INFORMATION ONLY

                                                                     EXHIBIT 2.4

                                ESCROW AGREEMENT

AMONG THE UNDERSIGNED:

Cephalon France Holdings, a simplified stock corporation (SOCIETE PAR ACTIONS
SIMPLIFIEE) the registration number for which at the Registry of Commerce and
Companies (REGISTRE DU COMMERCE ET DES SOCIETES) is being obtained and the
registered office of which is located at 37, rue des Mathurins - 75008 Paris
herein represented by Mr. Jonathan Schur, thereunto duly authorized by a
power-of-attorney given by Mr. Martyn Greenacre, in his capacity as President,
himself thereunto duly authorized,

                                         (hereinafter called the "Beneficiary"),

                                                        PARTY OF THE FIRST PART,

Ms. Andree Lafon nee Carpentier, widow (VEUVE) of Mr. Louis Lafon, an
individual, born in Hanoi (Vietnam) on April 15, 1918, who resides at 5, rue de
l'Alboni - 75016 Paris, France, duly represented by Mr. Francois Lafon

                                        (hereinafter called "Ms. Andree Lafon"),

                                                        PARTY OF THE SECOND PART

AND:

OBC - Odier Bungener Courvoisier, a banking institution registered with the
Registry of Commerce and Companies (REGISTRE DU COMMERCE ET DES SOCIETES) of
Paris under number 572 025 799, the registered office of which is located at 57,
avenue d'Iena - 75116 Paris, herein represented by Mr. Olivier de l'Epine acting
under a power-of-attorney dated December 12, 2001,

                                        (hereinafter called the "Escrow Agent"),

                                                        PARTY OF THE THIRD PART.

Ms. Andree Lafon, the Beneficiary, and the Escrow Agent are hereinafter together
called the "Parties" and separately a "Party".

PARTICIPATING IN THIS AGREEMENT:

Mr. Francois Lafon, an individual, born in Paris on October 27, 1944, residing
at 41, avenue Foch - 75116 Paris, France,

                                      (hereinafter called "Mr. Francois Lafon"),



Mr. Francois Lafon and Ms. Andree Lafon are hereinafter together called the
"Warrantors".

RECITALS:

(A)  Cephalon, Inc., an American corporation organized in the State of Delaware
     with its principal place of business located at 145 Brandywine Parkway,
     West Chester, Pennsylvania 19380, United States, and the Warrantors have
     entered into a Share Purchase Agreement, dated December 3, 2001, as amended
     by an amendment dated December 28, 2001 (hereinafter called the "Share
     Purchase Agreement"), pursuant to which Cephalon, Inc., agreed to acquire
     from the Warrantors all of the shares of Financiere Lafon, a corporation
     (SOCIETE ANONYME) with its registered office located at 12, rue Clement
     Marot - 75008 Paris, (hereinafter called the "Company") together with a
     minimum of 2,556 shares of the Company's subsidiary, Organisation de
     Synthese Mondiale Orsymonde, a corporation (SOCIETE ANONYME) with its
     registered office located at 12, rue Clement Marot - 75008 Paris, for a
     cash payment of four hundred fifty million U.S. Dollars ($450,000,000) paid
     on the Closing Date.

(B)  Cephalon, Inc., and the Warrantors have entered into a Representations and
     Warranties Agreement, dated December 3, 2001, as amended by an amendment
     dated December 28, 2001 (hereinafter called the "Representations and
     Warranties Agreement"), under which the Warrantors have made certain
     representations and warranties and given certain assurances to Cephalon,
     Inc., about the Company and its Subsidiaries. The Representations and
     Warranties Agreement provides that, on the Closing Date, the Beneficiary
     will pay into escrow a portion of the Price due to Ms. Andree Lafon, I.E.,
     forty-five million U.S. dollars ($45,000,000) in cash (hereinafter called
     the "Escrowed Amount"), as security for the Warrantors' obligations under
     the Representations and Warranties Agreement.

(C)  As provided under Article 7(c) of the Share Purchase Agreement, Cephalon,
     Inc., has exercised its right of substitution set forth in such Article,
     which has resulted in the automatic substitution of the Beneficiary under
     the terms and conditions of the Share Purchase Agreement and the
     Representations and Warranties Agreement.

(D)  The sale described in Paragraph A hereof has occurred on the day hereof,
     I.E., the Closing Date. As set forth in paragraph B hereinabove, the
     Escrowed Amount will be paid out of the portion of the Price to which Ms.
     Andree Lafon is entitled, but there shall be no limitation on the
     Beneficiary's right to demand from Mr. Francois Lafon the payment due by
     him and secured by the Escrowed Amount, which Mr. Francois Lafon,
     participating herein, hereby acknowledges.

(E)  The Escrow Agent has agreed to act as escrow agent pursuant to this Escrow
     Agreement (hereinafter called the "Escrow Agreement"), to accept the
     deposit of the Escrowed Amount, to hold, invest, and release the Escrowed
     Amount as


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     provided on the terms and conditions of the Escrow Agreement.

NOW, THEREFORE, THE PARTIES HERETO HEREBY AGREE AS FOLLOWS:

1. DEFINITIONS.

     1.1  For purposes of this Agreement "Business Day" shall be a day on which
          the Escrow Agent's registered office is open.

     1.2  All capitalized terms used herein, which are not otherwise defined in
          the Escrow Agreement, shall have the definitions given to them in the
          Representations and Warranties Agreement or the Share Purchase
          Agreement, a copy of which is being delivered to the Escrow Agent.

2. APPOINTMENT OF ESCROW AGENT.

     The Beneficiary and Ms. Andree Lafon hereby appoint the Escrow Agent to act
     as escrow agent for the purpose of receiving, retaining, investing, and
     releasing the Escrowed Amount, and the Escrow Agent hereby accepts its
     appointment as escrow agent on the terms and conditions set forth in the
     Escrow Agreement.

3. APPOINTMENT OF THE MS. ANDREE LAFON' REPRESENTATIVE.

     Ms. Andree Lafon hereby appoints Mr. Francois Lafon (hereinafter called the
     "Representative") for the purpose of acting as her agent and representative
     for all questions relating to the Escrow Agreement. She hereby authorizes
     Mr. Francois Lafon, as Representative, to take any steps required by the
     Escrow Agreement, or relating thereto, and especially to receive any
     payment made by the Escrow Agent. It is understood and agreed that this
     authorization shall continue to apply, as an exception to Article 2003 of
     the Civil Code, after Ms. Andree Lafon's death. Mr. Francois Lafon hereby
     accepts his appointment as Representative. Release of the Escrowed Amount
     to Mr. Francois Lafon shall be deemed release of the Escrowed Amount to Ms.
     Andree Lafon, without the Escrow Agent having any further responsibility
     with respect thereto. Any step or communication communicated to, or
     received by, the Representative shall be deemed taken or received by Ms.
     Andree Lafon.

4. DEPOSIT WITH THE ESCROW AGENT.

     Simultaneously with the signing of the Escrow Agreement, the Escrowed
     Amount shall be paid by bank transfer by the Beneficiary to a joint account
     n(degree)11793200004 17 - bank code (code banque) 40798 - branch (guichet)
     00001, SWIFT code OBCFRPP, in the name of Ms. Andree Lafon and the
     Beneficiary, not acting jointly, with the Escrow Agent. Ms. Andree Lafon
     and the Beneficiary agree that the Escrowed Amount shall remain in escrow
     with the Escrow Agent, and that Ms. Andree Lafon, on the one hand, and the
     Beneficiary, on the other hand, shall not withdraw, or attempt to withdraw,
     the Escrowed Amount from the Escrow Agent otherwise than on the terms and
     conditions of


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     the Escrow Agreement.

5. ESCROW.

     Upon initial receipt of the Escrowed Amount, the Escrow Agent will deposit
     it in the separate escrow account described in Article 4 hereinabove and
     will hold it as provided in the Escrow Agreement.

6. INVESTMENT OF THE ESCROWED AMOUNT.

     The Escrow Agent shall invest the Escrowed Amount in U.S. dollar
     certificates of deposit (comptes a terme). The Escrowed Amount shall remain
     so invested until receipt by the Escrow Agent of joint instructions to the
     contrary from Ms. Andree Lafon and the Beneficiary. Any return on the
     Escrowed Amount shall be paid solely to Ms. Andree Lafon at the times
     agreed by Ms. Andree Lafon and the Escrow Agent.

7. NOTICES OF CLAIMS.

     The Beneficiary may at any time during the eighteen months following the
     Closing Date give notice to the Escrow Agent indicating that it has given
     notice to the Warrantors of a Claim under the Representations and
     Warranties Agreement (hereinafter called a "Claim Notice").

     The Claim Notice shall be in the form annexed hereto as Exhibit A. It
     shall, among other things, include a copy of the Claim and state the total
     amount claimed by the Beneficiary under (i) such Claim and (ii) any Claim
     made prior thereto and not resolved on the day the Claim Notice is given
     (hereinafter called the "Amounts Claimed").

     Solely for purposes of this Escrow Agreement, any Claim Notice received
     after June 30, 2003 shall be deemed null and void.

     The Escrow Agent shall be advised by Ms. Andree Lafon and the Beneficiary,
     in the form of notice annexed as Exhibit B, of any payment, total or
     partial, made by the Warrantors with respect to a Claim (hereinafter called
     a "Resolved Claim").

     It is understood and agreed, to the extent required, that any payment with
     respect to a Resolved Claim as well as any payment charged to the Escrowed
     Amount and paid to the Beneficiary following a Claim shall be deducted from
     the Amounts Claimed in respect thereof.

8. RELEASE OF THE ESCROWED AMOUNT.

     For purposes of this Escrow Agreement, the Parties agree that any reference
     to the "Escrowed Amount" shall mean amounts in escrow on the date on which
     the amount of such amounts is calculated.

     The Escrowed Amount shall be released in the following manner, to the
     benefit of Ms. Andree Lafon, or the Beneficiary, as the case may be:


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     8.1  RELEASE OF THE ESCROWED AMOUNT TO MS. ANDREE LAFON AND/OR THE
          BENEFICIARY.

          (a)  Within ten (10) Business Days following receipt by the Escrow
               Agent of joint instructions from Ms. Andree Lafon and the
               Beneficiary (a form of which is annexed hereto as Exhibit C), the
               Escrow Agent shall pay to Ms. Andree Lafon or the Beneficiary, as
               the case may be, the amount which the instructions indicate are
               to be paid to Ms. Andree Lafon or the Beneficiary, up to the
               limit of the Escrowed Amount.

          (b)  Within ten (10) Business Days following receipt by the Escrow
               Agent of a certificate of Ms. Andree Lafon or the Beneficiary (a
               form of which is annexed hereto as Exhibit D), to which shall be
               attached a copy of the judgment described below, the Escrow Agent
               shall pay to the Beneficiary or Ms. Andree Lafon, as the case may
               be, the amount that such certificate indicates is due to the
               Beneficiary, or Ms. Andree Lafon, up to the limit of the Escrowed
               Amount.

               The certificate shall indicate (i) that a decision has been
               handed down by a court or arbitration panel (such decision to be
               either a final judgment of a court of general jurisdiction,
               subject to execution, and unappealable, or a decision of the
               highest court of appeal, or a decision, subject to execution,
               delivered by a court of appeal, or an arbitration award, without
               the need to obtain recognition and execution thereof (exequatur))
               (hereinafter called the "Decision"), (ii) the amount due either
               by the Warrantors to the Beneficiary, or by the Beneficiary to
               Ms. Andree Lafon under the Decision, and (iii) that the amount
               due has not been paid during the month following receipt of such
               written request.

     8.2  PAYMENT OF THE ESCROWED AMOUNT TO MS. ANDREE LAFON.

          The Escrow Agent shall pay to Ms. Andree Lafon, at the times set forth
          hereinabove, the difference (if any) between the Escrowed Amounts and
          the amounts set forth hereinbelow:

          (a)  Thirty-three million seven hundred fifty thousand U.S. dollars
               ($33,750,000).

               Such payment shall be made within ten (10) Business Days
               following receipt by the Escrow Agent of a certificate of Ms.
               Andree Lafon or the Beneficiary in the form annexed hereto as
               Annex E stating that the procedure set forth in Article 6 of the
               Share Purchase Agreement has been completed, and that no Price
               Reduction and/or Price Differential is due thereunder.

               It is agreed in any event that the payment set forth in the
               foregoing paragraph shall not occur prior to expiration of a
               period of four months


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               after the Closing Date, i.e. April 29, 2002;

               Notwithstanding the foregoing, if a Price Reduction or Price
               Differential had to be paid to the Beneficiary under Article 8.3
               hereinbelow the Escrow Agent shall pay to Ms. Andree Lafon,
               simultaneously with the payment to the Beneficiary, an amount
               equal to (i) the amount calculated as provided in paragraph (a)
               hereinabove, reduced by (ii) the amount paid to the Beneficiary
               in connection with such Price Reduction and/or Price
               Differential.

          (b)  Twenty-two million U.S. dollars ($22,000,000) twelve months after
               the Closing Date, i.e., December 30, 2002;

          (c)  Zero U.S. dollars eighteen months after the Closing Date, i.e.,
               June 30, 2002.

          It is understood and agreed that the payment set forth in paragraphs
          (b) and (c) hereinabove shall be made automatically by the Escrow
          Agent.

          However, the provisions of paragraphs (a), (b), and (c) hereinabove
          shall not apply, if their effect would be to reduce the Escrowed
          Amount to an amount less than the Amount Claimed. It is understood and
          agreed that the payment process set forth in such provisions shall
          automatically resume as soon as the amount of the Escrowed Amount once
          again becomes greater than, or equal to, the amount of the Amounts
          Claimed (especially following a Resolved Claim).

     8.3  PAYMENT TO THE BENEFICIARY.

          Within ten (10) days following receipt by the Escrow Agent of a
          certificate from the Beneficiary (a form of which is attached hereto
          as Exhibit F) stating that the procedure set forth in Article 6 of the
          Share Purchase Agreement has been completed, the Escrow Agent shall
          pay to the Beneficiary any Price Reduction and/or Price Differential,
          up to the limit of the Escrowed Amount.

          The certificate shall confirm that (i) the procedure set forth in
          Article 6 of the Share Purchase Agreement has been completed, (ii)
          that a Price Reduction and/or a Price Differential is (are) due by the
          Warrantors under such procedure, (iii) that the Warrantors have not
          paid the amount of the Price Reduction and/or Price Differential to
          the Beneficiary on the terms and conditions set forth in the Share
          Purchase Agreement, and (iv) the amount of the Price Reduction and/or
          Price Differential should be released from the Escrowed Amount for the
          Beneficiary's benefit. There shall be attached to the certificate a
          copy of the certificate of the firm of Deloitte & Touche or Mazars et
          Guerard, as the case may be, indicating the amount of the Price
          Reduction and/or Price Differential due by the Warrantors under
          Article 6 of the Share Purchase Agreement.

9. TERM OF THE ESCROW AGENT'S OBLIGATIONS.


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     9.1  The Escrow Agent's obligations shall end eighteen months after the
          Closing Date, i.e., June 30, 2003 (hereinafter called the "Expiration
          Date"). If, however, the Escrow Agent receives notice, no later than
          June 30, 2003, in the form of Exhibit G hereto, confirming that a
          Claim Notice is still unresolved, the Expiration Date shall be the
          first to occur of the following dates:

          (a)  Ten (10) Business Days from receipt by the Escrow Agent of joint
               instructions (in the form annexed hereto as Exhibit C) of Ms.
               Andree Lafon and the Beneficiary which have the effect of
               reducing the Escrowed Amount to zero; or

          (b)  Ten (10) Business Days from receipt by the Escrow Agent of a
               certificate from Ms. Andree Lafon (in the form annexed hereto as
               Exhibit H) to which shall be attached a copy of the Decision,
               confirming that no amount is due by the Warrantors as a result of
               disagreements which were the subject of Claims Notices; or

          (c)  Ten (10) Business Days from receipt by the Escrow Agent of a
               certificate of the Beneficiary (in the form annexed hereto as
               Exhibit D) to which shall be attached a copy of the Decision,
               showing (i) the amount due by the Warrantors under the Decision,
               and (ii) that the consequence of the payment of the amount due by
               the Warrantors will be to reduce the Escrowed Amount to zero.

     9.2  On the Expiration Date the Escrow Agent shall pay to Ms. Andree Lafon
          the balance of the Escrowed Amount existing on such date, without Ms.
          Andree Lafon (and/or the Warrantors) and/or the Beneficiary having to
          perform any formality or deliver any document to the Escrow Agent.

10. DISAGREEMENTS.

     In the event of a disagreement between the Parties over the interpretation
     or performance of the Escrow Agreement, the Escrow Agent shall, in no case,
     take any position on the claims of one or the other of the Parties to the
     Escrow Agreement. Since it shall have no power to make any interpretation
     hereof prevail over another one, and since it shall be required to remain
     strictly neutral, the Escrow Agent, subject to Article 12 hereof, shall
     have no liability to the Beneficiary or Ms. Andree Lafon under such
     circumstances. Any unresolved problem relating to the interpretation of the
     Escrow Agreement shall be resolved as provided under Article 15 hereof.

11. ESCROW AGENT'S UNDERTAKING.

     The Escrow Agent undertakes hereby to receive the Escrowed Amount, to keep
     it whole, and to invest the Escrowed Amount as required by Article 6 hereof
     and not to permit the withdrawal thereof otherwise than as permitted by the
     terms and conditions of the Escrow Agreement. The Escrow Agent shall be
     liable only for the safekeeping and investment of


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     the funds making up the Escrowed Amount and for their release, as provided
     in the Escrow Agreement. Notwithstanding anything to the contrary in the
     Escrow Agreement, the Escrow Agent shall have no liability with respect to
     the performance by the Beneficiary and Ms. Andree Lafon of any of the
     obligations binding thereon under the Escrow Agreement and shall not be
     bound by the terms of any other agreement (including, but not limited to,
     the Share Purchase Agreement) by or among the Beneficiary and the
     Warrantors or any of them, or any other person or party (whether or not the
     Escrow Agent is aware of such agreement), the Escrow Agreement
     acknowledging hereby that it is aware of the Share Purchase Agreement and
     the Representations and Warranties Agreement as a result of receiving a
     copy thereof.

12. PERFORMANCE OF THE ESCROW AGENT'S DUTIES.

     In the performance of its duties under the Escrow Agreement and in the
     event of an alleged breach in the performance of the duties for which it is
     responsible hereunder, the Escrow Agent shall have no liability to anyone
     for damages, losses, or costs which may arise as a result of its actions or
     omissions in such capacity; provided, however, that the Escrow Agent shall
     be liable in damages resulting from its actions, or from its misconduct in
     violation of the Escrow Agreement. Consequently, the Escrow Agent shall not
     incur such liability for (a) any action or omission taken in good faith
     upon the advice of its counsel with respect to any questions relating to
     the duties and responsibilities of the Escrow Agent hereunder, or (b) any
     action or omission taken on the basis of documents, including any written
     notice or instructions contemplated under the Escrow Agreement regarding
     not only the genuineness of their signature and the validity and effect of
     their provisions, but also the authenticity of any information they may
     contain, which the Escrow Agent believed in good faith to be genuine, to
     have been signed or submitted by the person(s) authorized with respect
     thereto and to be in compliance with the provisions of the Escrow
     Agreement.

13. ESCROW AGENT'S FEES.

     The Escrow Agent's ordinary services (i.e., receipt, investment, and
     release of the Escrowed Amount) shall not give rise to any fee. However,
     the Beneficiary and Ms. Andree Lafon shall jointly be liable (each for
     half) to reimburse the Escrow Agent for any unusual expenses in a
     reasonable amount (especially fees of counsel) incurred exclusively by the
     Escrow Agent in performing its duties under the Escrow Agreement and shall
     indemnify the Escrow Agent against any loss, claim, debt, cost, payment,
     and expense imposed on, or incurred by, such Escrow Agent in connection
     with the Escrow Agreement, except for expenses resulting from its own
     negligence, bad faith, or mismanagement.

14. INSTRUCTIONS AND NOTICES.

     Any notice under the Escrow Agreement shall be deemed to have been properly
     given, if it is given by registered letter (return receipt requested), by
     express delivery service against receipt, or by personal delivery against
     handwritten receipt thereof, at the


                                       8


     addresses hereinafter set forth, or such other address as may be notified
     by one of the Parties to the others as provided in this Article 14, not
     less than five (5) business days prior to the notice:

                  If to the Beneficiary:

                           Cephalon France Holdings
                           c/o Cephalon, Inc.
                           145 Brandywine Parkway
                           West Chester, Pennsylvania
                           19380 United States
                           To the Attention of its General Counsel

                  with a copy thereof to:

                           Dechert
                           55, avenue Kleber
                           75116 Paris

                           Attention:  Jonathan A. Schur, Esq.

                  If to Ms. Andree Lafon:

                           Mr. Francois Lafon
                           c/o Maitre Joel Chevreau
                           Bureau d'Etudes Juridiques Peyre
                           174, rue de l'Universite
                           75007 Paris

                  If to the Escrow Agent:
                           Banque OBC
                           57, avenue d'Iena
                           75116 Paris
                           To the Attention of Mr. Bernard Petitjean
                           Legal Department

     Notices shall be deemed effective on the date they are received, provided,
     however, that they shall be deemed received by the Party involved (i) three
     (3) Business Days after the first attempt to deliver a registered letter,
     return receipt requested, or express delivery service with return receipt
     requested and (ii) the first Business Day following the day of the
     handwritten acknowledgment of receipt in the case of personal delivery. A
     copy of any notice by any Party to the Escrow Agent shall be simultaneously
     sent to the other Party to be valid.

15. GOVERNING LAW AND JURISDICTION.


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     The Escrow Agreement shall be governed by French law and construed in
     accordance therewith. Any dispute which may arise under the Escrow
     Agreement relating to its interpretation shall be submitted to the Tribunal
     de Commerce [Commercial Court] of Paris.

16. HEADINGS.

     The headings of the Escrow Agreement are for convenience and reference only
     and shall not have the effect of interpreting, defining, or limiting the
     scope or meaning of the Escrow Agreement or any of its provisions, or the
     intention of the parties with respect thereto.

17. WAIVER.

     No omission or delay in the exercise by a Party of any right, remedy, or
     authority under the Escrow Agreement shall be construed as a waiver of such
     right, remedy, or authority. Likewise, no partial or single exercise of
     such right, remedy, or authority by a Party shall prevent such right,
     remedy, or authority from being exercised again in the future. To be valid,
     any waiver of such right, remedy, or authority by a Party shall be made in
     writing and notified to the Parties as provided in Article 14 hereof.

18. SEVERABILITY.

     Each provision of the Escrow Agreement shall be severable. If a term or
     condition of the Escrow Agreement shall be illegal or invalid for any
     reason whatsoever, such illegality or invalidity shall not affect the
     validity or applicability of the other provisions hereof. If any provision
     of the Escrow Agreement should be invalid, illegal, or inapplicable, the
     Parties shall, promptly and in good faith, undertake to negotiate to
     replace the provision involved with one or more valid, legal, and
     applicable provisions which will have an economic and/or legal effect as
     close as possible to the one of the invalid, illegal, or inapplicable
     provision.

19. COUNTERPARTS.

     The Escrow Agreement and any amendment thereto may be signed in one or more
     counterparts, each counterpart being deemed to be an original, but all
     counterparts taken together being deemed to constitute but one and the same
     legal instrument.

20. AMENDMENT.

     Any amendment of the Escrow Agreement shall be valid only if it is in
     writing and signed by all the Parties hereto.

21. SUCCESSORS-IN-INTEREST.

     The Escrow Agreement shall be binding on the Parties and on their
     respective successors-in-interest and/or assigns and shall be enforceable
     by them and against them, provided,


                                       10


     however, that:

          -    Ms. Andree Lafon may not assign the Escrow Agreement;

          -    the Beneficiary shall have the right to assign this Escrow
               Agreement only as provided in the Representations and Warranties
               Agreement, i.e., it may assign its rights under the Escrow
               Agreement to an Associated Company or a third party to which the
               Shares are simultaneously assigned, provided that (i) such
               assignment involve the entire Escrow Agreement and that (ii) the
               Beneficiary remain jointly liable for the performance by the
               Associated Company or the third party of the obligations by which
               it is bound under the Escrow Agreement;

          -    the Escrow Agent may assign the Escrow Agreement only in
               connection with a transaction involving all of its assets or of
               the operating division involved by the Escrow Agent.

22. CONFIDENTIALITY.

     The Escrow Agreement shall be treated as strictly confidential.
     Consequently, its contents shall not be disclosed or communicated by any of
     the Parties to a third party without the express written agreement of the
     other Parties, except for information disclosed by the Parties to their
     lawyers or other advisors and statements or information which must be made
     or provided to any governmental authority or any agency having
     jurisdiction.


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Signed in Paris,
In four (4) originals
On December 28, 2001



Cephalon France Holdings                      Participating and agreeing
                                              to act as Representative:

                                              Mr. Francois Lafon
/s/ Jonathan Schur                            /s/ Francois Lafon
- -------------------------                     ----------------------------
By: Mr. Jonathan Schur

Ms. Andree Carpentier widow (VEUVE) of
Mr. Louis Lafon

By: /s/ Francois Lafon
    ------------------------------
    Mr. Francois Lafon


Escrow Agent

By: /s/ Olivier de l'Epine
    -------------------------
Name:  Olivier de l'Epine
Title: Managing Director


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