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EXHIBIT 10.1

AGREEMENT

     AGREEMENT made and entered into in New York, New York, by and between Antigenics Inc. (the
“Company”), a Delaware corporation with a principal place of business at 630 Fifth Ave. Suite 2100
New York, NY, and Bruce Leicher (the “Executive”), effective as of the 28th day of
November, 2005 (the “Effective Date”) (the “Agreement”). Words or phrases which are initially
capitalized or are within quotation marks shall have the meanings provided in Section 14 below and
as provided elsewhere herein.

     WHEREAS, the operations of the Company and its Affiliates are a complex matter requiring
direction and leadership in a variety of arenas;

     WHEREAS, the Executive is possessed of certain experience and expertise that qualify him to
provide the direction and leadership required by the Company; and

     WHEREAS, subject to the terms and conditions hereinafter set forth, the Company therefore
wishes to employ the Executive and the Executive wishes to accept such employment;

     NOW, THEREFORE, in consideration of the foregoing premises and the mutual promises, terms,
provisions and conditions set forth in this Agreement, the parties hereby agree:

     1. Employment. Subject to the terms and conditions set forth in this Agreement, the
Company hereby offers and the Executive hereby accepts employment.

     2. Term. Subject to earlier termination as hereafter provided, this Agreement shall
have an original term of one year commencing on the Effective Date hereof and shall be
automatically extended thereafter for successive terms of one year each, unless either party
provides notice to the other at least ninety (90) days prior to the expiration of the original or
any extension term this Agreement is not to be extended. The term of this Agreement, as from time
to time extended or renewed, is hereafter referred to as “Term”.

     3. Capacity and Performance.

          (a) During the Term hereof, the Executive shall be employed by the Company on a full-time
basis and shall perform such duties and responsibilities on behalf of the Company and its
Affiliates as may be designated from time to time consistent with his position. In addition, and
without further compensation, the Executive shall serve as a director and/or officer of one or more
of the Company’s Affiliates if so elected or appointed from time to time.

          (b) During the Term hereof, the Executive shall devote his best efforts, business judgment,
skill and knowledge to the advancement of the business and interests of the Company and its
Affiliates and to the discharge of his duties and responsibilities hereunder. The Executive shall
not engage in any other business activity or serve in any industry, trade, professional,
governmental or academic position during the Term of this Agreement, except as may be approved by
the Board of Directors of the Company (the “Board”) or its designee.

 

 

     4. Compensation and Benefits. As compensation for all services performed by the
Executive under and during the Term hereof and subject to performance of the Executive’s duties and
of the obligations of the Executive to the Company and its Affiliates, pursuant to this Agreement
or otherwise:

          (a) Base Salary. During the Term hereof, the Company shall pay the Executive a
minimum base salary at the rate of $285,000 per annum, payable in accordance with the payroll
practices of the Company for its executives and subject to increase by the Board, in its sole
discretion. Such base salary, as from time to time increased, is hereafter referred to as the
“Base Salary”. The Board shall review the Base Salary no less than annually.

          (b) Incentive and Bonus Compensation. During the Term hereof, the Executive shall be
entitled to participate in the Company’s Executive Incentive Plan to the extent eligible and in
accordance with the terms thereof, as such terms may be modified or amended by the Company from
time to time; provided, however, that nothing contained herein shall obligate the Company to
continue such incentive compensation program. The Executive’s target incentive bonus under the
Executive Incentive Plan is 40% of his Base Salary. Such target may be modified by the Company
from time to time, in its sole discretion. Any compensation paid to the Executive under the
Executive Incentive Plan shall be in addition to the Base Salary.

          (c) Stock Options. In connection with the commencement of the Executive’s employment,
the Executive shall be granted an option to purchase 150,000 shares of common stock of the Company.
At the discretion of the Compensation Committee of the Board, the Executive may be granted
additional options to purchase shares of stock of the Company in the future. Any existing or
future grants, shall be governed by the terms of the applicable Company stock option plan, as
amended from time to time, and any stock option certificate, stock option agreement, and other
restrictions generally applicable to Company stock options.

          (d) Vacations. During the Term hereof, the Executive shall be entitled to four weeks
of vacation per annum, to be taken at such times and intervals as shall be determined by the
Executive, subject to the reasonable business needs of the Company.

          (e) Other Benefits. During the Term hereof and subject to any contribution therefor
generally required of employees (including executives) of the Company, the Executive shall be
entitled to participate in any and all employee benefit plans from time to time in effect for
employees of the Company generally, except to the extent such plans are in a category of benefit
otherwise provided to the Executive. Such participation shall be subject to (i) the terms of the
applicable plan documents, (ii) generally applicable Company policies and (iii) the discretion of
the Board or any administrative or other committee provided for in or contemplated by such plan.
The Company may alter, modify, add to or delete its employee benefit plans at any time as it, in
its sole judgment, determines to be appropriate, without recourse by the Executive.

          (f) Business Expenses. The Company shall pay or reimburse the Executive for all
reasonable, customary and necessary business expenses incurred or paid by the Executive in the
performance of his duties and responsibilities hereunder, subject to any maximum annual limit and
other restrictions on such expenses as set forth in the Company’s Travel Policy as may

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be amended from time to time, and to such reasonable substantiation and documentation as may
be specified by the Company from time to time.

     5. Termination of Employment and Severance Benefits. Notwithstanding the provisions
of Section 2 hereof, but subject to Section 6 hereof, the Executive’s employment hereunder shall
terminate prior to the expiration of the Term under the following circumstances:

          (a) Death. In the event of the Executive’s death during the Term hereof, the
Executive’s employment hereunder shall immediately and automatically terminate. In the event of
the Executive’s death during the Term hereof, the Company shall pay to the Executive’s designated
beneficiary or, if no beneficiary has been designated by the Executive, to his estate, any earned
and unpaid Base Salary and accrued but unused vacation through the date of his death.

          (b) Disability.

               (i) The Company may terminate the Executive’s employment hereunder, upon notice to the
Executive, in the event that the Executive becomes disabled during his employment hereunder
through any illness, injury, accident or condition of either a physical or psychological
nature and, as a result, is unable to perform substantially all of his duties and
responsibilities hereunder, with or without a reasonable accommodation, for ninety (90) days
during any period of three hundred and sixty-five (365) consecutive calendar days.

               (ii) The Board may designate another employee to act in the Executive’s place during
any period of the Executive’s disability. Notwithstanding any such designation, the
Executive shall continue to receive the Base Salary in accordance with Section 4(a) and
benefits in accordance with Section 4(e), to the extent permitted by the then-current terms
of the applicable benefit plans, until the Executive becomes eligible for disability income
benefits under the Company’s disability income plan or until the termination of his
employment, whichever shall first occur.

               (iii) While receiving disability income payments under the Company’s disability income
plan, the Executive shall not be entitled to receive any Base Salary under Section 4(a)
hereof, but shall continue to participate in Company benefit plans in accordance with
Section 4(e) and the terms of such plans, until the termination of his employment.

               (iv) If any question shall arise as to whether during any period the Executive is
disabled through any illness, injury, accident or condition of either a physical or
psychological nature so as to be unable to perform substantially all of his duties and
responsibilities hereunder, the Executive may, and at the request of the Company shall,
submit to a medical examination by a physician selected by the Company to whom the Executive
or his duly appointed guardian, if any, has no reasonable objection to determine whether the
Executive is so disabled and such determination shall for the purposes of this Agreement be
conclusive of the issue. If such question shall arise

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and the Executive shall fail to submit to such medical examination, the Company’s
determination of the issue shall be binding on the Executive.

               (v) In the event the Company terminates the Executive’s employment hereunder due to
disability, the Company shall pay to the Executive any accrued and unpaid Base Salary and
accrued but unused vacation through the date of termination.

          (c) By the Company for Cause. The Company may terminate the Executive’s employment
hereunder for Cause at any time upon fourteen (14) day notice to the Executive setting forth in
reasonable detail the nature of such Cause. The following, as determined by the Company in its
reasonable judgment, shall constitute Cause for termination:

               (i) The Executive’s failure to perform (other than by reason of disability), or
negligence in the performance of, his duties and responsibilities to the Company or any of
its Affiliates; or

               (ii) Material breach by the Executive of any provision of this Agreement; or

               (iii) Other conduct by the Executive that is materially harmful to the business,
interests or reputation of the Company or any of its Affiliates.

     Upon the giving of notice of termination of the Executive’s employment hereunder for Cause,
the Company shall have no further obligation or liability to the Executive, other than for Base
Salary earned and unpaid and accrued vacation earned but not taken at the date of termination.

          (d) By the Company Other than for Cause. The Company may terminate the Executive’s
employment with the Company other than for Cause at any time upon notice to the Executive. In the
event of such termination, the Company shall either (i) pay the Executive the benefits payable
under an executive severance plan, if such a plan is in place on the date of termination and if the
Executive is eligible for such benefits under such a plan or, if the present value to the Executive
is greater, (ii) continue to pay the Executive his Base Salary, at the rate in effect on the date
of termination, until the conclusion of a period of twelve (12) months following the date of
termination. In addition, the Company shall pay to the Executive in one lump sum an amount equal
to the higher of (x) the Executive’s target incentive bonus under the Executive Incentive Plan for
the year in which the Executive’s employment is terminated or (y) the actual incentive bonus paid
to the Executive, if any, under the Executive Incentive Plan for the last full fiscal year
preceding the year in which the Executive’s employment is terminated; and shall also, until the
conclusion of a period of twelve (12) months following the date of termination, pay the full
premium cost of the Executive’s participation in the Company’s group medical and dental insurance
plans, provided that the Executive is entitled to continue such participation under applicable law
and plan terms. The Company will also provide the Executive with an outplacement assistance
benefit in the form of a lump-sum payment of $15,000 plus an additional lump-sum payment in an
amount sufficient, after giving effect to all federal, state and other taxes with respect to such
additional payment, to make Executive whole for all taxes

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(including withholding taxes) on such outplacement assistance benefit. Furthermore, at the
sole discretion of the Compensation Committee of the Board, any unvested options to purchase
Company stock may be accelerated.

          (e) By the Executive for Reduction in Salary or Benefits. The Executive may terminate
his employment hereunder based on a material reduction in Base Salary or benefits due in accordance
with the terms of this Agreement (“Compensation Reduction”), provided that Executive provides
notice to the Company setting forth in reasonable detail the nature of such Compensation Reduction,
and provided further that the Company shall have thirty (30) days from such notice to cure such
reduction. In the event of termination in accordance with this Section 5(e), the Company shall
either (i) pay the Executive the benefits payable under an executive severance plan, if such a plan
is in place on the date of termination and if the Executive is eligible for such benefits under
such a plan or, if the present value to the Executive is greater, (ii) continue to pay the
Executive his Base Salary, at the rate in effect on the date of termination, until the conclusion
of a period of twelve (12) months following the date of termination. In addition, the Company
shall pay to the Executive in one lump sum an amount equal to the higher of (x) the Executive’s
target incentive bonus under the Executive Incentive Plan for the year in which the Executive’s
employment is terminated or (y) the actual incentive bonus paid to the Executive, if any, under the
Executive Incentive Plan for the last full fiscal year preceding the year in which the Executive’s
employment is terminated; and shall also, until the conclusion of a period of twelve (12) months
following the date of termination, pay the full premium cost of the Executive’s participation in
the Company’s group medical and dental insurance plans, provided that the Executive is entitled to
continue such participation under applicable law and plan terms. The Company will also provide the
Executive with an outplacement assistance benefit in the form of a lump-sum payment of $15,000 plus
an additional lump-sum payment in an amount sufficient, after giving effect to all federal, state
and other taxes with respect to such additional payment, to make Executive whole for all taxes
(including withholding taxes) on such outplacement assistance benefit. In addition, at the sole
discretion of the Compensation Committee of the Board, any unvested options to purchase Company
stock may be accelerated.

          (f) By the Executive Other than for a Compensation Reduction. The Executive may
terminate his employment hereunder at any time upon sixty (60) days’ notice to the Company, unless
such termination would violate any obligation of the Executive to the Company under a separate
severance agreement. In the event of termination of the Executive pursuant to this Section 5(f),
the Board may elect to waive the period of notice, or any portion thereof, and, if the Board so
elects, the Company will pay the Executive his Base Salary for the notice period (or for any
remaining portion of the period).

          (g) Upon a Change of Control.

               (i) If a Change of Control occurs on the date of such Change in Control, fifty-percent
(50%) of any stock options previously granted to the Executive that are outstanding and
unvested as of that date shall become vested and exercisable,

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provided that the Executive is employed by the Company on the date of such Change in
Control.

               (ii) If a Change of Control occurs and within eighteen (18) months following such
Change of Control, the Company terminates the Executive’s employment other than for Cause,
or the Executive terminates his employment as a result of a Compensation Reduction or for
Good Reason (as defined herein), then, in lieu of any payments to or on behalf of the
Executive under Section 5(d) or 5(e) hereof, the Company shall pay to the Executive in one
lump sum an amount equal to (A) eighteen (18) months Base Salary at the rate in effect on
the date of termination, plus (B) 150% of the higher of (x) the Executive’s target incentive
bonus under the Executive Incentive Plan for the year in which the Executive’s employment is
terminated or (y) the actual incentive bonus paid to the Executive, if any, under the
Executive Incentive Plan for the last full fiscal year preceding the year in which the
Executive’s employment is terminated; and shall also, until the conclusion of a period of
eighteen (18) months following the date of termination, pay the full premium cost of the
Executive’s participation in the Company’s group medical and dental insurance plans,
provided that the Executive is entitled to continue such participation under applicable law
and plan terms. In addition, any outstanding unvested options granted to the Executive as
of the date of the Change in Control shall become vested and shall be exercisable for ninety
(90) days following termination of the Executive’s employment. The Company will also provide
the Executive with an outplacement assistance benefit in the form of a lump-sum payment of
$15,000 plus an additional lump-sum payment in an amount sufficient, after giving effect to
all federal, state and other taxes with respect to such additional payment, to make
Executive whole for all taxes (including withholding taxes) on such outplacement assistance
benefit.

               (iii) All payments required to be made by the Company hereunder to Executive or his
dependents, beneficiaries, or estate will be subject to the withholding of such amounts
relating to tax and/or other payroll deductions as may be required by law.

     In the event that it is determined that any payment or benefit provided by the Company
to or for the benefit of Executive, either under this Agreement or otherwise, will be
subject to the excise tax imposed by Section 4999 of the Internal Revenue Code or any
successor provision(s) (“Section 4999”), the Company will, prior to the date on which any
amount of the excise tax must be paid or withheld, make an additional lump-sum payment (the
“Gross-up Payment”) to Executive in an amount sufficient, after giving effect to all
federal, state and other taxes and charges (including interest and penalties, if any) with
respect to the gross-up payment, to make Executive whole for all taxes (including
withholding taxes) and any associated interest and penalties, imposed under or as a result
of Section 4999.

               Determinations under this Section 5(g)(iii) will be made by an accounting firm engaged
by the Company (the “Firm”). The determinations of the Firm will be binding upon the
Company and Executive except as the determinations are established in

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resolution (including by settlement) of a controversy with the Internal Revenue Service
to have been incorrect. All fees and expenses of the Firm will be paid by the Company.

               If the Internal Revenue Service asserts a claim that, if successful, would require the
Company to make a Gross-up Payment or an additional Gross-up Payment, the Company and
Executive will cooperate fully in resolving the controversy with the Internal Revenue
Service. The Company will make or advance such Gross-up Payments as are necessary to
prevent Executive from having to bear the cost of payments made to the Internal Revenue
Service in the course of, or as a result of, the controversy. The Firm will determine the
amount of such Gross-up Payments or advances and will determine after final resolution of
the controversy whether any advances must be returned by Executive to the Company. The
Company will bear all expenses of the controversy and will gross Executive up for any
additional taxes that may be imposed upon Executive as a result of its payment of such
expenses.

     (iv) For the purpose of this Section 5(g), a “Change in Control” shall mean: (A) the
acquisition by any Organization of beneficial ownership (within the meaning of Rule 13d-3
promulgated under the Exchange Act) of 50% or more of the common stock of the Company;
provided, however, that for purposes of this subsection (A), an acquisition shall not
constitute a Change in Control if it is: (x) by a Benefit Plan sponsored or maintained by
the Company or an entity controlled by the Company or (y) by an entity pursuant to a
transaction that complies with clauses (x), (y) and (z) of subsection (C) of this Section
5(g)(iv); or (B) individuals who, as of September 22, 2005, constitute the Board (the
“Incumbent Board”) cease for any reason to constitute at least a majority of the Board;
provided, however, that any individual becoming a director subsequent to September 22, whose
election, or nomination for election by the Company’s stockholders, was approved by a vote
of at least a majority of the directors then comprising the Incumbent Board (or a majority
of the members of a nominating committee who are members of the Incumbent Board) shall be
treated as a member of the Incumbent Board unless he or she assumed office as a result of an
actual or threatened election contest with respect to the election or removal of directors
or other actual or threatened solicitation of proxies or consents by or on behalf of an
Organization other than the Board; or (C) consummation of a merger or consolidation
involving the Company, or a sale or other disposition of all or substantially all of the
assets of the Company, (a “transaction”) in each case unless, immediately following such
transaction, (x) the beneficial owners of the common stock of the Company outstanding
immediately prior to such transaction beneficially own, directly or indirectly, more than
50% of the combined voting power of the outstanding voting securities of the entity
resulting from such transaction (including, without limitation, an entity which as a result
of such transaction owns the Company or all or substantially all of the Company’s assets
either directly or through one or more subsidiaries), (y) no Organization (excluding any
entity resulting from such transaction or any Benefit Plan of the Company or such entity
resulting from such transaction) beneficially owns, directly or indirectly, 50% or more of
the combined voting power of the then outstanding voting securities of such entity and (z)
at least a majority of the members of the board of directors or similar board of the entity

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resulting from such transaction were members of the Incumbent Board at the time of the
execution of the initial agreement, or of the action of the Board, providing for such
transaction; or (D) approval by the stockholders of the Company of a complete liquidation or
dissolution of the Company. For purposes of the foregoing: “Benefit Plan” means any
employee benefit plan, including any related trust; “Board” means the Board of Directors of
the Company; “Exchange Act” means the Securities Exchange Act of 1934, as amended; and
“Organization” means any individual, entity or group (within the meaning of Section 13(d)(3)
or Section 14(d)(2) of the Exchange Act).

          (h) Effect of Failure to Renew by Company. In the event the Company chooses not to
renew the Term hereof, such failure to renew shall be treated as a termination by the Company other
than for “Cause” unless the Company gives notice that the failure to renew is for “Cause” as
defined in Section 5(c).

          (i) To the extent any payment under Section 5 shall be required to be delayed following
separation from service to comply with the “specified employee” rules of Section 409A of the
Internal Revenue Code, it shall be delayed (but not more than is required to comply with such
rules).

     6. Effect of Termination. The provisions of this Section 6 shall apply to termination
due to the expiration of the Term hereof, termination pursuant to Section 5 or otherwise.

          (a) Payment(s) by the Company and contributions to the cost of the Executive’s continued
participation in the Company’s group health and dental plans that may be due to the Executive under
Section 5 shall constitute the entire obligation of the Company to the Executive. In order to
receive any payments or any other benefits under Section 5(d) or 5(e) or 5(g) or 5(h), the
Executive must first execute a General Release of Claims in a form acceptable to the Company.

          (b) Except for medical and dental insurance coverage continued pursuant to Section 5(d) or
5(e) or 5(g) or 5(h) hereof, benefits shall terminate pursuant to the terms of the applicable
benefit plans based on the date of termination of the Executive’s employment without regard to any
continuation of Base Salary or other payment to the Executive following such date of termination.

          (c) Provisions of this Agreement shall survive any termination if so provided herein or if
necessary or desirable fully to accomplish the purposes of such provision, including without
limitation the obligations of the Executive under Sections 7, 8, 9 and 13 hereof. The obligation
of the Company to make payments to or on behalf of the Executive under Section 5(d) or 5(e) or 5(g)
or 5(h) hereof is expressly conditioned upon the Executive’s continued full performance of
obligations under Sections 7, 8, and 9 hereof. The Executive recognizes that, except as expressly
provided in Section 5(d) or 5(e) or 5(g) or 5(h), no compensation is earned by, or in any way owing
to, Executive after termination of employment.

          (d) Any lump-sum payments to be made to the Executive hereunder shall be made as soon as
administratively practicable and in any event no later than 21/2 months after the

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end of the year in which the Executive becomes entitled to such payment.

          (e) To the extent any payment hereunder shall be required to be delayed until six months
following separation from service to comply with the “specified employee” rules of Section 409A of
the Internal Revenue Code, it shall be delayed (but not more than is required) to comply with such
rules, and shall promptly after such delay be paid with interest at a reasonable market rate as
determined by the Company.

     7. Confidential Information.

          (a) The Executive acknowledges that the Company and its Affiliates continually develop
Confidential Information, that the Executive may develop Confidential Information for the Company
or its Affiliates and that the Executive may learn of Confidential Information during the course of
employment. The Executive will comply with the policies and procedures of the Company and its
Affiliates for protecting Confidential Information and shall never disclose to any Person or to any
governmental agency or political subdivision of any government (except as required by applicable
law or for the proper performance of his duties and responsibilities to the Company and its
Affiliates), or use for his own benefit or gain, any Confidential Information obtained by the
Executive incident to his employment or other association with the Company or any of its
Affiliates. The Executive understands that the restriction shall continue to apply after his
employment terminates, regardless of the reason for such termination.

          (b) All documents, records, tapes and other media of every kind and description relating to
the business, present or otherwise, of the Company or its Affiliates and any copies, in whole or in
part, thereof (the “Documents”), whether or not prepared by the Executive, shall be the sole and
exclusive property of the Company and its Affiliates. The Executive shall safeguard all Documents
and shall surrender to the Company at the time his employment terminates, or at such earlier time
or times as the Board or its designee may specify, all Documents then in the Executive’s possession
or control.

          (c) The Executive acknowledges and agrees that all Confidential Information and proprietary
materials that are provided by the Company to the Executive under this Agreement are and shall
remain the exclusive property of the Company or the third party entrusting such Confidential
Information or proprietary materials to the Company.

     8. Restricted Activities. The Executive agrees that some restrictions on his
activities during and after his employment are necessary to protect the goodwill, Confidential
Information and other legitimate interests of the Company and its Affiliates:

          (a) While the Executive is employed by the Company and for the greater of (i) twelve (12)
months after his employment terminates or (ii) the period during which the Executive is receiving
payments under Section 5(d) or 5(e) or 5(g) or 5(h) (the “Non-Competition Period”), the Executive
shall not, directly or indirectly, whether as owner, partner, investor, consultant, agent,
employee, co-venturer or otherwise, compete with the Company or any of its Affiliates or undertake
any planning for any business competitive with the Company or

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any of its Affiliates. Specifically, but without limiting the foregoing, the Executive agrees
not to engage in any manner in any activity that is directly or indirectly competitive with the
business of the Company or any of its Affiliates as conducted or under consideration at any time
during the Executive’s employment. Restricted activity includes without limitation accepting
employment or a consulting position with any Person who is, or at any time within twelve (12)
months prior to the termination of the Executive’s employment has been, a competitor or a customer
of the Company or any of its Affiliates. For the purposes of this Section 8, the business of the
Company and its Affiliates shall include all Products and the Executive’s undertaking shall
encompass all items, products and services that may be used in substitution for Products. The
foregoing shall not prohibit the Executive’s passive ownership of two percent (2%) or less of the
equity securities of any publicly traded company.

          (b) The Executive agrees that, during his employment with the Company or any Affiliate of the
Company, he will not undertake any outside activity, whether or not competitive with the business
of the Company or its Affiliates, that could reasonably give rise to a conflict of interest or
otherwise interfere with his duties and obligations to the Company or any of its Affiliates.

          (c) The Executive further agrees that while he is employed by the Company or any Affiliate of
the Company and thereafter during the Non-Competition Period, the Executive will not hire or
attempt to hire any employee of the Company or any of its Affiliates, assist in such hiring by any
Person, encourage any such employee to terminate his or her relationship with the Company or any of
its Affiliates or solicit or encourage any customer or vendor of the Company or any of its
Affiliates to terminate its relationship with them, or, in the case of a customer, to conduct with
any Person any business or activity which such customer conducts or could conduct with the Company
or any of its Affiliates.

     9. Assignment of Rights to Intellectual Property. The Executive shall promptly and
fully disclose, if he has not done so already, all Intellectual Property to the Company. The
Executive shall maintain adequate records (whether written, electronic, or otherwise) to document
the Intellectual Property, including without limitation the conception and reduction to practice of
all inventions, and shall make such records available to the Company upon request. The Company
shall have sole ownership of all Intellectual Property and all such records with respect thereto.
The Executive hereby assigns, conveys, and grants to the Company (or as otherwise directed by the
Company), and agrees to assign, convey and grant to the Company (or as otherwise directed by the
Company), all of his right, title, and interest in and to the Intellectual Property and any and all
patents, patent applications, and copyrights relating to the Intellectual Property. The Executive
agrees to execute any and all applications for domestic and foreign patents, copyrights or other
proprietary rights and to do such other acts (including without limitation the execution and
delivery of instruments of further assurance or confirmation) requested by the Company to assign
the Intellectual Property to the Company and to permit the Company to enforce any patents,
copyrights or other proprietary rights to the Intellectual Property. The Executive will not charge
the Company for time spent in complying with these obligations. All copyrightable works that the
Executive creates shall be considered “work made for hire”.

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The Executive represents that the attached Exhibit A contains a complete list of all
inventions, copyrightable works, tangible materials, and other intellectual property that the
Executive (either alone or jointly with others) conceived, developed, discovered, created, or
reduced to practice prior to the Effective Date (the “Prior IP”). The Prior IP is not assigned to
the Company under this Agreement, except to the extent that the Executive expressly assigns such
Prior IP to the Company under the terms of a separate written instrument. If no Prior IP is listed
on Exhibit A, the Executive represents that no Prior IP exists. The Executive recognizes
that the protection of the Intellectual Property of the Company against unauthorized disclosure and
use is of critical importance to the Company, and therefore, the Executive agrees to use his best
efforts and exercise utmost diligence to protect and safeguard the Intellectual Property of the
Company and its Affiliates, if any, and, except as may be expressly required by the Company in
connection with the Executive’s performance of his obligations to the Company under this Agreement,
the Executive shall not, either during the Term of this Agreement or thereafter, directly or
indirectly, use for his own benefit or for the benefit of another, or disclose to another, any of
such Intellectual Property.

     10. Notification Requirement. Until the conclusion of the Non-Competition Period the
Executive shall give notice to the Company of each new business activity he plans to undertake, at
least twenty-one (21) days prior to beginning any such activity. Such notice shall state the name
and address of the Person for whom such activity is undertaken and the nature of the Executive’s
business relationship(s) and position(s) with such Person. The Executive shall provide the Company
with such other pertinent information concerning such business activity as the Company may
reasonably request in order to determine the Executive’s continued compliance with his obligations
under Sections 7, 8 and 9 hereof.

     11. Enforcement of Covenants. The Executive acknowledges that he has carefully read
and considered all the terms and conditions of this Agreement, including the restraints imposed
upon him pursuant to Sections 7 and 8 hereof. The Executive agrees that said restraints are
necessary for the reasonable and proper protection of the Company and its Affiliates and that each
and every one of the restraints is reasonable in respect to subject matter, length of time and
geographic area. The Executive further acknowledges that, were he to breach any of the covenants
contained in Sections 7 or 8 hereof, the damage to the Company would be irreparable. The Executive
therefore agrees that the Company, in addition to any other remedies available to it, shall be
entitled to preliminary and permanent injunctive relief against any breach or threatened breach by
the Executive of any of said covenants, without having to post bond. The parties further agree
that, in the event that any provision of Section 7 or 8 hereof shall be determined by any court of
competent jurisdiction to be unenforceable by reason of its being extended over too great a time,
too large a geographic area or too great a range of activities, such provision shall be deemed to
be modified to permit its enforcement to the maximum extent permitted by law.

     12. Conflicting Agreements. The Executive hereby represents and warrants that the
execution of this Agreement and the performance of his obligations hereunder will not breach or be
in conflict with any other agreement to which the Executive is a party or is bound and that the
Executive is not now subject to any covenants against competition or similar covenants that

-11-

 

would affect the performance of his obligations hereunder. The Executive will not disclose to
or use on behalf of the Company any proprietary information of a third party without such party’s
consent.

     13. Indemnification. The Company shall indemnify the Executive to the extent provided
in its then current Articles or By-Laws. The Executive agrees to promptly notify the Company of
any actual or threatened claim arising out of or as a result of his employment with the Company.

     14. Definitions. For purposes of this Agreement, the following definitions apply:

          (a) “Affiliates” means all persons and entities directly or indirectly controlling, controlled
by or under common control with the Company, where control may be by either management authority or
equity interest.

          (b) “Confidential Information” means any and all information of the Company and its Affiliates
that is not generally known by others. Confidential Information includes without limitation such
information relating to (i) the development, research, testing, manufacturing, marketing and
financial activities of the Company and its Affiliates, (ii) the Products, (iii) the costs, sources
of supply, financial performance and strategic plans of the Company and its Affiliates, (iv) the
identity and special needs of the customers of the Company and its Affiliates and (v) the people
and organizations with whom the Company and its Affiliates have business relationships and those
relationships. Confidential Information also includes comparable information that the Company or
any of its Affiliates have received belonging to others or which was received by the Company or any
of its Affiliates with any understanding that it would not be disclosed.

          (c) “Good Reason” means: (i) the relocation of the Executive’s principal office, without his
prior consent, to a location more than thirty (30) miles from its location on the day prior to the
Change in Control; (ii) failure of the Company to continue the Executive in the position held
immediately prior to the Change of Control; or (iii) material and substantial diminution in the
nature or scope of the Executive’s responsibilities, duties or authority; however, the Company’s
failure to continue the Executive’s appointment or election as a director or officer of any of its
Affiliates and any diminution of the business of the Company or any of its Affiliates, including
without limitation the sale or transfer of any or all of the assets of the Company or any of its
Affiliates, shall not constitute “Good Reason”.

          (d) “Intellectual Property” means inventions, discoveries, developments, methods, processes,
compositions, works, concepts and ideas (whether or not patentable or copyrightable or constituting
trade secrets) conceived, made, created, developed or reduced to practice by the Executive (whether
alone or with others, whether or not during normal business hours or on or off Company premises)
during the Executive’s employment and during the period of twelve (12) months immediately following
termination of his employment that relate to either the Products or any prospective activity of the
Company or any of its Affiliates.

          (e) “Person” means an individual, a corporation, an association, a

-12-

 

partnership, an estate, a trust and any other entity or organization, other than the Company
or any of its Affiliates.

          (f) “Products” mean all products planned, researched, developed, under development, tested,
manufactured, sold, licensed, leased or otherwise distributed or put into use by the Company or any
of its Affiliates, together with all services provided or planned by the Company or any of its
Affiliates, during the Executive’s employment.

     15. Withholding. All payments made by the Company under this Agreement shall be
reduced by any tax or other amounts required to be withheld by the Company under applicable law.

     16. Assignment. Neither the Company nor the Executive may make any assignment of this
Agreement or any interest herein, by operation of law or otherwise, without the prior written
consent of the other; provided, however, that the Company may assign its rights and obligations
under this Agreement without the consent of the Executive in the event that the Company shall
hereafter affect a reorganization, consolidate with, or merge into, any other Person or transfer
all or substantially all of its properties or assets to any other Person. This Agreement shall
inure to the benefit of and be binding upon the Company and the Executive, their respective
successors, executors, administrators, heirs and permitted assigns.

     17. Severability. If any portion or provision of this Agreement shall to any extent
be declared illegal or unenforceable by a court of competent jurisdiction, then the remainder of
this Agreement, or the application of such portion or provision in circumstances other than those
as to which it is so declared illegal or unenforceable, shall not be affected thereby, and each
portion and provision of this Agreement shall be valid and enforceable to the fullest extent
permitted by law.

     18. Waiver. No waiver of any provision hereof shall be effective unless made in
writing and signed by the waiving party. The failure of either party to require the performance of
any term or obligation of this Agreement, or the waiver by either party of any breach of this
Agreement, shall not prevent any subsequent enforcement of such term or obligation or be deemed a
waiver of any subsequent breach.

     19. Notices. Any and all notices, requests, demands and other communications provided
for by this Agreement shall be in writing and shall be effective when delivered in person or
deposited in the United States mail, postage prepaid, registered or certified, and addressed to the
Executive at his last known personal address on the books of the Company or, in the case of the
Company, at its principal place of business, attention of Senior Attorney, or to such other address
as either party may specify by notice to the other actually received.

     20. Entire Agreement. This Agreement constitutes the entire agreement between the
parties and supersedes all prior communications, agreements and understandings, written or oral,
with respect to the terms and conditions of the Executive’s employment, excluding any obligations
with respect to the securities of the Company or the grant of any stock options.

-13-

 

     21. Amendment. This Agreement may be amended or modified only by a written instrument
signed by the Executive and by an expressly authorized representative of the Company.

     22. Headings. The headings and captions in this Agreement are for convenience only
and in no way define or describe the scope or content of any provision of this Agreement.

     23. Counterparts. This Agreement may be executed in two or more counterparts, each of
which shall be an original and all of which together shall constitute one and the same instrument.

     24. Governing Law. This is a contract and shall be construed and enforced under and
be governed in all respects by the laws of the Commonwealth of Massachusetts, without regard to the
conflict of laws principles thereof.

[SIGNATURE PAGE FOLLOWS]

-14-

 

     IN WITNESS WHEREOF, this Agreement has been executed as a sealed instrument by the Company, by
its duly authorized representative, and by the Executive, as of the date first above written.

	 	 	 	 	 	 	 	 	 
	THE EXECUTIVE:	 	 	 	ANTIGENICS INC., a Delaware corporation	 	 
	 
	 	 	 	 	 	 	 	 
	/s/ Bruce Leicher

	 	 	 	By: 
	 	       /s/
Garo H. Armen	 	 
	 

	 	 	 	 	 	 	 
	Bruce Leicher
	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	 	Name:	        Garo H. Armen
	 

	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	 	Title: 	        Chairman
and CEO
	 

	 	 	 	 	 	 	 	 

-15-

 

EXHIBIT A

LIST OF PRIOR IP

NONE

-16-FIRST AMENDMENT TO CREDIT AGREEMENT
                       -----------------------------------

                  FIRST AMENDMENT TO CREDIT AGREEMENT (this "First Amendment"),
dated as of November 28, 2005, among CELANESE HOLDINGS LLC, a Delaware limited
liability company ("Holdings"), BCP CRYSTAL US HOLDINGS CORP., a Delaware
corporation (the "Company"), CELANESE AMERICAS CORPORATION, a Delaware
corporation ("CAC"), the lenders from time to time party thereto (the
"Lenders"), and DEUTSCHE BANK AG NEW YORK BRANCH ("DBNY"), as administrative
agent (in such capacity, the "Administrative Agent"), and as collateral agent
(in such capacity, the "Collateral Agent"). Unless otherwise indicated, all
capitalized terms used herein and not otherwise defined herein shall have the
respective meanings provided such terms in the Credit Agreement referred to
below.

                          W I T N E S S E T H :
                          - - - - - - - - - -

                  WHEREAS, Holdings, the Company, CAC, the Lenders from time to
time party thereto, the Deposit Bank and the Agents are parties to an Amended
and Restated Credit Agreement, dated as of April 6, 2004 and amended and
restated as of January 26, 2005 (the "Credit Agreement");

                  WHEREAS, on the date hereof, (i) there are no outstanding C
Term Loans or Delayed Draw Commitments in respect thereof and (ii) there are
outstanding B Term Loans (for purposes of this First Amendment, herein called
the "Refinanced B Term Loans") in an aggregate principal amount of (x) in the
case of Dollar Term Loans, $1,389,659,098.24, and (y) in the case of Euro Term
Loans, (euro)273,379,679.80;

                  WHEREAS, in accordance with the provisions of Section 9.08(e)
of the Credit Agreement, the Company wishes to amend the Credit Agreement to
enable it to convert and/or refinance in full the outstanding B Term Loans
described in the immediately preceding paragraph through (x) the conversion of
outstanding B Term Loans into replacement B Term Loans and/or (y) its incurrence
of replacement B Term Loans (for purposes of this First Amendment, the
replacement B Term Loans described in preceding clauses (x) and (y) collectively
being herein called the "Replacement B Term Loans") as more fully provided
herein, in each case with the same terms as were theretofore applicable to the B
Term Loans except that the pricing applicable thereto shall be as more fully
described herein; and

                  WHEREAS, the parties hereto wish to amend the Credit Agreement
to provide for the Replacement B Term Loans and for certain other changes in
each case as herein provided;

                  NOW, THEREFORE, it is agreed:

      Amendments to Credit Agreement.

     1. On, or within five Business Days after the occurrence of, the First
Amendment Execution Date (as hereinafter defined) (subject to the receipt of a
Borrowing Request in form and substance reasonably satisfactory to the
Administrative Agent and substantially in accordance with the requirements of
Section 2.03 of the Credit Agreement, and subject to the relevant conditions
specified in Section 4.01 of the Credit Agreement and the occurrence of the
First Amendment Effective Date (as hereinafter defined)), each Lender with a B
Term Loan Commitment as set forth in the Register as of the First Amendment
Effective Date hereby agrees to make a B Term Loan in the respective principal
amount set forth opposite its name under the heading "B Term Loan Commitment" in
the Register as of the First Amendment Effective Date, in each case in
accordance with the relevant requirements of the Credit Agreement except that
(i) the date of the making of the B Term Loans described in this paragraph,
other than those B Term Loans being converted into Replacement B Term Loans,
shall be as set forth above and (ii) each Lender with a B Term Loan Commitment
as set forth in the Register as of the First Amendment Effective Date shall make
the respective B Term Loan available (through the Administrative Agent) in cash,
except that each Lender with a B Term Loan Commitment as shown in the Register
as of the First Amendment Effective Date with existing B Term Loans outstanding
immediately prior to the occurrence of the First Amendment Effective Date shall
convert its theretofore outstanding B Term Loans (in a principal amount up to,
but not in excess of, the B Term Loan of such Lender as specified in the Lender
Register on the date hereof) into Replacement B Term Loans hereunder without any
requirement that it make cash proceeds available to the Company (except to the
extent that the B Term Loan Commitment of such Lender as specified in the
Register as of the First Amendment Effective Date exceeds the principal amount
of its theretofore outstanding B Term Loans). For the avoidance of doubt and
notwithstanding anything to the contrary contained in the Credit Agreement or
this First Amendment, the amendments to the definition of "Applicable Margin"
contained herein do not decrease the rate of interest on the Euro Term Loans
and, accordingly, each Term Lender holding Euro Term Loans outstanding
immediately prior to the occurrence of the First Amendment Effective Date will
be deemed to convert its theretofore outstanding Euro Term Loans (in a principal
amount up to, but not in excess of, the Euro Term Loan of such Term Lender
outstanding on the date hereof) into Replacement B Term Loans hereunder and
maintained as Euro Term Loans under the Credit Agreement without any requirement
that it make cash proceeds available to the Company (solely in respect of its
Euro Term Loans). In addition, except for those Term Lenders that are converting
their Euro Term Loans as provided in the immediately preceding sentence, each
other Lender with a B Term Loan Commitment will make (or, as provided in the
second preceding sentence, convert) its Replacement B Term Loan in Dollars. The
Company hereby directs the Administrative Agent to apply (and the Administrative
Agent shall apply) all cash proceeds of Replacement B Term Loans made hereunder
to refinance then outstanding Refinanced B Term Loans pursuant to the Credit
Agreement (before giving effect to the First Amendment) other than those B Term
Loans being converted into Replacement B Term Loans. It is understood that (i)
the Replacement B Term Loans being made pursuant to this First Amendment
(whether by conversion or the making of cash proceeds available to the Company
to refinance Refinanced B Term Loans) shall constitute Replacement Term Loans
pursuant to Section 9.08(e) of the Credit Agreement and the B Term Loans being
refinanced or converted shall constitute Refinanced Term Loans as described
therein and (ii) the Replacement B Term Loans shall constitute B Term Loans for
purposes of the Credit Agreement and the other Loan Documents. It is understood
and agreed by all parties

                                    -2-

hereto that the aggregate principal amount of B Term Loans outstanding after
giving effect to the First Amendment Effective Date shall be equal to the
aggregate principal amount of B Term Loans which were outstanding immediately
prior to giving effect thereto. Any Lender holding outstanding B Term Loans
immediately prior to the First Amendment Effective Date, that does not (in its
sole discretion) provide a B Term Loan Commitment pursuant hereto, shall have
its outstanding B Term Loans repaid in full on the First Amendment Effective
Date (if same occurs). On the First Amendment Effective Date, the aggregate
principal amount of Replacement B Term Loans (including those made by conversion
or the making of cash proceeds available to the Company) shall be comprised of
the same number of Borrowings as were applicable to the outstanding Refinanced B
Term Loans immediately prior to the First Amendment Effective Date, which
Borrowings shall be of the same Types and in the same amounts as the Borrowings
theretofore applicable to the Refinanced B Term Loans, and in the case of any
such Borrowings of Eurocurrency Term Loans shall have the same Interest Period
(i.e. continuing to the date of the expiration Interest Period theretofore
applicable to the corresponding Borrowing of Refinanced B Term Loans) and the
same Adjusted LIBO Rate (although, from and after the First Amendment Effective
Date, the Applicable Margin applicable thereto shall be determined in accordance
with the definition of "Applicable Margin", as amended pursuant to following
paragraph numbered 2) applicable thereto on the First Amendment Effective Date.
Each Lender with Replacement B Term Loans shall participate on a pro rata basis
in each outstanding Borrowing of Replacement B Term Loans as described in the
immediately preceding sentence. In connection with the incurrence of the
Replacement B Term Loans and the repayment of Refinanced B Term Loans in
accordance with this First Amendment, the Company hereby agrees that,
notwithstanding anything to the contrary contained in the Credit Agreement, (i)
if requested by any Lender making cash proceeds available to the Company
pursuant to the Replacement B Term Loans (but not with respect to that portion
of the Replacement B Term Loans of any Lender constituting a conversion of
Refinanced B Term Loans of such Lender), the Company shall pay to such Lender
such amounts necessary, as reasonably determined by such Lender, to compensate
such Lender for making such Replacement B Term Loans during an existing Interest
Period (rather than at the beginning of the respective Interest Period, based
upon the rates then applicable thereto) and (ii) the Company shall be obligated
to pay to each Lender whose B Term Loans are being repaid in cash (rather than
converted into Replacement B Term Loans on the First Amendment Effective Date)
amounts of the type referred to in Section 2.16 of the Credit Agreement (as set
forth on a certificate of each such Lender setting forth the amounts such Lender
is entitled to receive pursuant to such Section 2.16, which certificate shall be
prima facie evidence of the amounts thereof) in connection with its repayment in
cash (but not by way of conversion of Refinanced B Term Loans into Replacement B
Term Loans as contemplated above) of such Refinanced B Term Loans of such Lender
incurred in connection with the conversion of Refinanced B Term Loans and/or the
actions taken pursuant to the preceding sentence of this Section I.1.

     2. The definition of "Applicable Margin" appearing in Section 1.01 of the
Credit Agreement is hereby amended by deleting same in its entirety and
inserting in lieu thereof the following new definition:

     "Applicable Margin" shall mean with respect to (A) (i) any Eurocurrency
   Loan that is a Revolving Facility Loan (x) for any day not occurring in a
   Reduction Period, 2.50% per annum and (y) for any day occurring in a
   Reduction Period, 2.25% per annum, and (ii) any ABR Loan that is a Revolving
   Facility

                                  -3-

   Loan (x) for any day not occurring in a Reduction Period, 1.50% per annum and
   (y) for any day occurring in a Reduction Period, 1.25% per annum, (B) (i) any
   Eurocurrency Loan that is an Original Dollar Term Loan (x) for any day not
   occurring in a Reduction Period, 2.00% per annum and (y) for any day
   occurring in a Reduction Period, 1.75% per annum and (ii) any ABR Loan that
   is an Original Dollar Term Loan (x) for any day not occurring in a Reduction
   Period, 1.00% per annum and (y) for any day occurring in a Reduction Period,
   0.75% per annum, (C) any Additional Dollar Term Loan, subject to Section
   2.23(b)(iii), that percentage per annum set forth in the relevant New B Term
   Loan Joinder Agreement (or, in the case of any Additional Dollar Term Loans
   extended pursuant to more than one New B Term Loan Joinder Agreement on the
   relevant Increased Amount Date, as may be provided in the first New B Term
   Loan Joinder Agreement executed and delivered with respect to such Additional
   Dollar Term Loans) and (D) any Euro Term Loan (x) for any day not occurring
   in a Reduction Period, 2.50% per annum and (y) for any day occurring in a
   Reduction Period, 2.25% per annum.

     Notwithstanding the foregoing, (x) the new definition of "Applicable
Margin" set forth above shall only apply for periods from and after the First
Amendment Effective Date and (y) the provisions of the Credit Agreement
(including the definition of "Applicable Margin") as in effect before giving
effect to this First Amendment shall apply for all periods prior to the First
Amendment Effective Date and shall apply to all Refinanced B Term Loans
outstanding pursuant to the Credit Agreement before giving effect to any
conversion thereof to Replacement B Term Loans pursuant to this First Amendment
and shall apply to all Term Loans which were outstanding at the time prior to
the First Amendment Effective Date.

     3. The definition of "B Term Loan Facility" appearing in Section 1.01 of
the Credit Agreement is hereby amended by (i) deleting the word "and" appearing
at the end of clause (i) thereof and (ii) inserting the following new clause
(iii) at the end thereof:

     "and (iii) the commitments under Section 2.23 to make New B Term Loans,
     and the New B Term Loans made pursuant thereto".

     4. The definition of "B Term Loans" appearing in Section 1.01 of the Credit
Agreement is hereby amended by (i) deleting the word "and" appearing at the end
of clause (x) thereof and inserting a comma in lieu thereof and (ii) inserting
the following new clause (z) at the end thereof:

    "and (z) the New B Term Loans, if any, made pursuant to Section 2.23".

     5. The definition of "Commitment" appearing in Section 1.01 of the Credit
Agreement is hereby amended by (i) deleting the word "and" appearing at the end
of clause (a) thereof and inserting a comma in lieu thereof and (ii) inserting
the following new clause (c) at the end thereof:

     "and (c) with respect to any New B Term Lender, such Lender's
     commitment to make New B Term Loans under Section 2.23".

                              -4-

     6. The definition of "Dollar Term Loan" appearing in Section 1.01 of the
Credit Agreement is hereby amended by deleting same in its entirety and
inserting in lieu thereof the following new definition:

        "Dollar Term Loan" shall mean (x) each Original Dollar Term Loan and
        (y) each Additional Dollar Term Loan.

     7. The definition of "Maximum Term Amount" appearing in Section 1.01 of the
Credit Agreement is hereby amended by inserting the following new text at the
end thereof:

        "plus (iv) the aggregate principal amount of all New B Term Loans then
        or theretofore made pursuant to Section 2.23".

     8. The definition of "Reduction Period" appearing in Section 1.01 of the
Credit Agreement is herby amended by deleting same in its entirety and inserting
in lieu thereof the following new definition:

     "Reduction Period" shall mean (i) with respect to any Original Dollar Term
   Loan, either (x) any period during which Topco or Parent is assigned a senior
   implied rating of BB- or higher by Moody's and the Company is assigned an
   issuer credit rating of Ba3 or higher by S&P or (y) after the delivery of the
   financial statements required pursuant to Section 5.04(b) for Holdings'
   fiscal quarter ending closest to June 30, 2006, any fiscal quarter if the
   Total Leverage Ratio on the last day of the immediately preceding fiscal
   quarter was less than 2.25 to 1.00, but only to the extent that the Company
   shall have delivered to the Administrative Agent within 45 days after such
   last day a certificate of a Financial Officer of the Company setting forth
   computations in reasonable detail satisfactory to the Administrative Agent
   showing that the Total Leverage Ratio was less than 2.25 to 1.00 on such last
   day and (ii) with respect to any Revolving Facility Loan or Euro Term Loan,
   any fiscal quarter if the Total Leverage Ratio on the last day of the
   immediately preceding fiscal quarter was less than 2.75 to 1.00, but only to
   the extent that the Company shall have delivered to the Administrative Agent
   within 45 days after such last day a certificate of a Financial Officer of
   the Company setting forth computations in reasonable detail satisfactory to
   the Administrative Agent showing that the Total Leverage Ratio was less than
   2.75 to 1.00 on such last day.

     9. Section 1.01 of the Credit Agreement is further amended by inserting the
following new definitions in the appropriate alphabetical order:

     "Additional Dollar Term Loans" shall mean any New B Term Loans which are
   not added to the then outstanding Original Dollar Term Loans because such New
   B Term Loans have a different Applicable Margin than that applicable to the
   Original Dollar Term Loans.

     "First Amendment" shall mean the First Amendment to this Agreement, dated
   as of November 28, 2005.

                              -5-

     "First Amendment Effective Date" shall have the meaning assigned to such
   term in the First Amendment.

     "Increased Amount Date" shall have the meaning provided in Section 2.23.

     "New B Term Lender" shall have the meaning provided in Section 2.23.

     "New B Term Loan Joinder Agreement" shall have the meaning provided in
   Section 2.23.

     "New B Term Loans" shall have the meaning provided in Section 2.23.

     "Original Dollar Term Loans" shall mean each Term Loan (x) that was first
   incurred prior to the Restatement Effective Date denominated in Dollars and
   continued as a Term Loan denominated in Dollars on such date pursuant to
   Section 2.01(a)(i) and (y) first incurred on or after the Restatement
   Effective Date as a Term Loan denominated in Dollars (other than any
   Additional Dollar Term Loan).

     10. Section 2.05(b) of the Credit Agreement is hereby amended by deleting
the amount "$150,000,000" appearing therein and inserting the amount
"$200,000,000" in lieu thereof.

     11. For the avoidance of doubt, it is understood and agreed that the
amounts of the remaining scheduled repayments of principal of Term Loans after
giving effect to this First Amendment shall remain unchanged from the schedule
set forth in Section 2.10(a) of the Credit Agreement.

     12. Section 2.12 of the Credit Agreement is hereby amended by inserting the
following new clause (f) at the end thereof:

     "(f) All voluntary prepayments of Original Dollar Term Loans effected on or
   prior to the first anniversary of the First Amendment Effective Date with the
   proceeds of a substantially concurrent issuance or incurrence of new term
   loans under this Agreement (including by way of conversion of any Original
   Dollar Term Loans into any such new tranche of replacement term loans (as
   Replacement Term Loans or otherwise), but excluding Replacement Term Loans
   contemplated by the First Amendment), as amended, amended and restated,
   supplemented, waived or otherwise modified from time to time (excluding a
   refinancing of all the Facilities outstanding under this Agreement in
   connection with another transaction not permitted by this Agreement (as
   determined prior to giving effect to any amendment or waiver of this
   Agreement being adopted in connection with such transaction)), shall be
   accompanied by a prepayment fee equal to 1.00% of the aggregate amount of
   such prepayments if the Applicable Margin (or similar interest rate spread)
   applicable to such new term loans is or, upon the satisfaction of certain
   conditions, could be less than the Applicable Margin applicable to the
   Original Dollar Term Loans as of the First Amendment Effective Date."

                              -6-

     13. Article II of the Credit Agreement is hereby further amended by
   inserting the following new Section 2.23 at the end thereof:

         "SECTION 2.23 New B Term Loans.

         (a)   New B Term  Commitments.  At any time prior to the date which is
     12 months prior to the Term Loan Maturity Date, the Company may by written
     notice to the Administrative Agent elect to request New B Term Lenders to
     provide Commitments to make incremental B Term Loans hereunder ("New B Term
     Loans) in an aggregate principal amount not to exceed $250.0 million the
     proceeds of which are to be used for general corporate purposes. Such
     notice shall specify the date (the "Increased Amount Date") on which the
     Company proposes that the borrowing of such New B Term Loans be made, which
     shall be a date not less than 10 Business Days after the date on which such
     notice is delivered to the Administrative Agent and prior to the date which
     is 12 months prior to the Term Loan Maturity Date. The Company shall notify
     the Administrative Agent in writing of the identity of each Term Lender or
     other financial institution reasonably acceptable to the Administrative
     Agent (each, a "New B Term Lender") to whom such new Commitments have been
     (in accordance with the prior sentence) allocated and the amounts of such
     allocations; provided that any Lender requested to provide all or a portion
     of such new Commitments may elect or decline, in its sole discretion, to
     provide a new Commitment. New B Term Loans shall be made on the Increased
     Amount Date; provided that (1) all such New B Term Loans shall be made in
     Dollars, (2) all such New B Term Loans shall be added to, and thereafter
     constitute, the then outstanding Original Dollar Term Loans for all
     purposes hereunder, although the Company may elect (which election may only
     be made twice) to designate New B Term Loans as Additional Dollar Term
     Loans hereunder by written notice to the Administrative Agent to the extent
     that the Applicable Margin for such New B Term Loans will be different than
     that applicable to the Original Term Loans or any Additional Dollar Term
     Loans theretofore incurred and then outstanding, (3) no Default or Event of
     Default shall exist on the Increased Amount Date before or after giving
     effect to such B New Term Loans, (4) Holdings shall be in compliance, on a
     Pro Forma Basis after giving effect to the incurrence of such New B Term
     Loans and the application of the proceeds thereof (and assuming that all
     New B Term Loans to be incurred on the relevant Increased Amount Date had
     been incurred on the first day, and had remained outstanding throughout,
     the relevant fiscal quarter), with the Financial Performance Covenants
     recomputed as at the last day of the most recently ended fiscal quarter of
     Holdings and the Subsidiaries, and Holdings shall deliver to the
     Administrative Agent a certificate of a Responsible Officer of Holdings to
     such effect, together with all relevant financial information and
     computations demonstrating (in reasonable detail) same, (5) the
     Administrative Agent shall have received a certificate of a Financial
     Officer of Holdings certifying that the New B Term Loans to be incurred on
     the relevant Increased Amount Date shall constitute "Designated Senior
     Debt" and "Senior Debt' under the Senior Subordinated Note Indenture (or
     the equivalent terms under any indenture governing any Permitted Senior
     Subordinated Debt Securities), (6) the Administrative Agent shall have
     received a certificate of a

                                -7-

     Financial Officer of Holdings (setting forth computations in reasonable
     detail satisfactory to it) certifying that the New B Term Loans to be
     incurred on the relevant Increased Amount Date are permitted by the terms
     of the outstanding Indebtedness of Holdings and its Subsidiaries,
     including, without limitation, the Senior Subordinated Notes and any
     Permitted Senior Subordinated Debt Securities and (7) such new Commitments
     shall be evidenced by one or more joinder agreements (each, a "New B Term
     Loan Joinder Agreement") executed and delivered to the Administrative Agent
     by each New B Term Lender, as applicable, and each shall be recorded in the
     Register, each of which shall be subject to the requirements set forth in
     Section 2.17(e).

         (b)  On the Increased  Amount Date,  subject to the  satisfaction of
     the foregoing terms and conditions, (i) each New B Term Loan shall be
     deemed for all purposes a B Term Loan hereunder, (ii) each New B Term
     Lender shall become a Term Lender with respect to the Term Loans and all
     matters relating thereto, (iii) the New B Term Loans shall have the same
     terms as the existing B Term Loans and be made by each New B Term Lender on
     the Increased Amount Date; provided that (x) the Applicable Margin for any
     New B Term Loans designated as Additional Dollar Term Loans shall be that
     percentage per annum set forth in the relevant New B Term Loan Joinder
     Agreement (or, in the case of any Additional Dollar Term Loans extended
     pursuant to more than one New B Term Loan Joinder Agreement on the relevant
     Increased Amount Date, as may be provided in the first New B Term Loan
     Joinder Agreement executed and delivered with respect to such Additional
     Dollar Term Loans); and (y) in no event shall the Applicable Margin as set
     forth in any such New B Term Loan Joinder Agreement for any Additional
     Dollar Term Loans exceed the Applicable Margin for Original Dollar Term
     Loans (as in effect on the First Amendment Effective Date) by more than
     0.25%, and (iv) upon making the New B Term Loans on the Increased Amount
     Date, the new Commitments in respect thereof shall terminate. All New B
     Term Loans made on any Increased Amount Date will be made in accordance
     with the procedures set forth in Sections 2.02 and 2.03 and subject to the
     conditions specified in Section 4.01.

         (c)  The Administrative Agent shall notify the Lenders promptly upon
     receipt of the Company's notice of the Increased Amount Date and, in
     respect thereof, the new Commitments and the New B Term Lenders in respect
     thereof.

         (d)  In connection  with the  incurrence of New B Term Loans  pursuant
     to this Section 2.23, the Lenders and the Borrowers hereby agree that,
     notwithstanding anything to the contrary contained in this Agreement, the
     Company and the Administrative Agent may take all such actions as may be
     necessary to ensure that all Lenders with outstanding B Term Loans continue
     to participate in each Borrowing of outstanding B Term Loans (after giving
     effect to the incurrence of New B Term Loans pursuant to this Section 2.23)
     on a pro rata basis, including by adding the New B Term Loans to be so
     incurred to the then outstanding Borrowings of B Term Loans on a pro rata
     basis even though as a result thereof such New B Term Loans (to the extent
     required to be maintained as Eurocurrency Term Loans) may effectively have
     a shorter Interest Period than the

                                  -8-

     then outstanding Borrowings of B Term Loans, and it is hereby agreed that
     the Company shall pay to such New B Term Lenders such amounts necessary, as
     reasonably determined by such New B Term Lenders, to compensate such New B
     Term Lender for making such New B Term Loans during an existing Interest
     Period (rather than at the beginning of the respective Interest Period,
     based upon the rates then applicable thereto), it being understood and
     agreed, however, that each incurrence of Additional Dollar Term Loans
     incurred pursuant to this Section 2.23 shall be made and maintained as
     separate Borrowings from the Original Dollar Term Loans and, to the extent
     such Additional Dollar Term Loans have a different Applicable Margin from
     any Additional Dollar Term Loans then outstanding, from such then
     outstanding Additional Dollar Term Loans."

         14.  Section 3.12 of the Credit Agreement is hereby amended by
     inserting the following new sentence at the end thereof:

         "The Company will use the proceeds of New B Term Loans (net of a
         portion of such proceeds used to satisfy related fees and expenses)
         made to it on each Increased Amount Date for general corporate
         purposes."

         15.  Section 5.10(a) of the Credit Agreement is hereby amended by
     inserting the following new text immediately after the text "that the
     Administrative Agent may reasonably request" appearing therein:

         "(including the execution, delivery and recording of Mortgage
         amendments as a result of the Replacement Term Loans contemplated by
         the First Amendment and/or the making of New B Term Loans contemplated
         by Section 2.23)".

II.  Miscellaneous Provisions.

         1.  In order to induce the Lenders to enter into this First Amendment,
each of Holdings and the Borrowers hereby represent and warrant that (i) no
Default or Event of Default exists as of the First Amendment Effective Date both
before and after giving effect to this First Amendment and the making of
Replacement B Term Loans as contemplated herein, and (ii) all of the
representations and warranties contained in the Credit Agreement are true and
correct in all material respects on the First Amendment Effective Date both
before and after giving effect to this First Amendment and the making of
Replacement B Term Loans as contemplated herein, with the same effect as though
such representations and warranties had been made on and as of the First
Amendment Effective Date (except to the extent that any representation or
warranty expressly relates to an earlier date, in which case such representation
and warranty shall be true and correct in all material respects as of such
earlier date).

         2.  This First Amendment is limited as specified and shall not
constitute a modification, acceptance or waiver of any other provision of the
Credit Agreement or any other Loan Document.

         3.  This First Amendment may be executed in any number of counterparts
and by the different parties hereto on separate counterparts, each of which
counterparts when executed and delivered shall be an original, but all of which
shall together constitute one and the

                                 -9-

same instrument. A complete set of counterparts shall be lodged with the Company
and the Administrative Agent.

          4. THIS FIRST AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES
HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAW OF THE
STATE OF NEW YORK.

          5. This First Amendment shall become effective on the date (the "First
Amendment Effective Date") when each of the following conditions shall have been
satisfied:

          (i)  the Administrative Agent, the Company, each other Loan Party, the
     Required Lenders, and each Lender with a B Term Loan Commitment in Dollars
     as shown in the Register (and required to make (or convert) Replacement B
     Term Loans in Dollars) as of the First Amendment Effective Date (which in
     aggregate total amount shall equal $1,389,659,098.24) shall have signed a
     counterpart hereof (whether the same or different counterparts) and shall
     have delivered (including by way of facsimile transmission) the same to
     White & Case LLP, 1155 Avenue of the Americas, New York, NY 10036
     Attention: Lisa Alexander (facsimile number 212-354-8113) (with the date of
     the satisfaction of the condition described in this clause (i) being herein
     called the "First Amendment Execution Date");

         (ii)   the Company shall have paid in full (x) all fees, costs and
     expenses (including legal fees and expenses) then due and payable pursuant
     to the Credit Agreement, (y) any amounts owing to a Lender pursuant to the
     last sentence of paragraph numbered 1 of Part I hereof, to the extent
     requested by such Lender of the Company at least three Business Days prior
     to the date when all other conditions to the First Amendment Effective Date
     have been satisfied (the "Notice Deadline"), it being understood and agreed
     that to the extent any such amounts are requested by a Lender after the
     Notice Deadline, the Company shall pay such amounts within 3 Business Days
     after the request therefor and (z) the principal of all outstanding B Term
     Loans (together with all accrued and unpaid interest thereon) which are not
     being converted into Replacement B Term Loans in accordance with the terms
     of this First Amendment;

         (iii)  there shall have been delivered to Administrative Agent copies
     of resolutions of the board of directors of each Loan Party approving and
     authorizing the execution, delivery and performance of this First
     Amendment, certified as of the First Amendment Effective Date by the
     corporate secretary or an assistant secretary of such Loan Party as being
     in full force and effect without modification or amendment; and

         (iv) the Administrative Agent shall have received from Simpson
     Thacher & Bartlett LLP, special New York counsel to the Loan Parties, an
     opinion addressed to each Agent and each of the Lenders and dated the First
     Amendment Effective Date, which opinion shall be in form and substance
     reasonably satisfactory to the Administrative Agent.

                                    -10-

          6. By executing and delivering a copy hereof, each Loan Party hereby
agrees that all Loans (including, without limitation, the Replacement B Term
Loans and all New B Term Loans) shall be fully guaranteed pursuant to the
Holdings Agreement and the U.S. Collateral Agreement in accordance with the
terms and provisions thereof and shall be fully secured pursuant to the Security
Documents.

          7. From and after the First Amendment Effective Date, all references
in the Credit Agreement and each of the other Loan Documents to the Credit
Agreement shall be deemed to be references to the Credit Agreement, as modified
hereby.

                                    * * *

                                   -11-

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