Document:

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                                                                   EXHIBIT 10.10

                      CATALYTICA COMBUSTION SYSTEMS, INC.

                  SERIES B PREFERRED STOCK PURCHASE AGREEMENT
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                               TABLE OF CONTENTS

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                                                                             Page
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Section 1. Authorization...................................................     1

        1.1  Authorization of Series B Preferred Stock.....................     1
        1.2  Sale of Series B Preferred Stock..............................     1

Section 2. Closing Date; Delivery..........................................     1

        2.1  Closing Date..................................................     1
        2.2  Delivery......................................................     1

Section 3. Representations and Warranties of the Company and Catalytica....     1

       3.1   Organization, Good Standing and Qualification.................     2
       3.2   Capitalization................................................     2
       3.3   Subsidiaries..................................................     3
       3.4   Authorization.................................................     3
       3.5   Valid Issuance................................................     4
       3.6   Governmental Consents.........................................     4
       3.7   Litigation....................................................     4
       3.8   Patents and Trademarks........................................     5
       3.9   Compliance with Other Instruments.............................     5
       3.10  Registration Rights...........................................     6
       3.11  Title to Property and Assets..................................     6
       3.12  Employee Benefit Plans........................................     6
       3.13  Tax Return and Payments.......................................     6
       3.14  Insurance.....................................................     6
       3.15  Labor Agreements and Actions..................................     6
       3.16  Financial Statements..........................................     7
       3.17  Changes.......................................................     7
       3.18  Voting Arrangements...........................................     8
       3.19  Hazardous Materials...........................................     8
       3.20  Agreements with Affiliates....................................     9
       3.21  Holding Company and Investment Company Status.................     9
       3.22  Possession of Franchises, Licenses, Etc.......................    10

Section 4. Representations, Warranties and Covenants of the Investor.......    10

       4.1   Authorization.................................................    10
       4.2   Purchase Entirely for Own Account.............................    10
       4.3   Disclosure of Information.....................................    10
       4.4   Investment Experience.........................................    11
       4.5   Restricted Securities.........................................    11
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       4.6   Further Limitations on Disposition..................................... 11
       4.7   Legends................................................................ 11
       4.8   Accredited Investor.................................................... 12

Section 5. Conditions of Investor's Obligations at Closing.......................... 12

       5.1   Representations and Warranties......................................... 12
       5.2   Performance............................................................ 12
       5.3   No Material Adverse Change............................................. 12
       5.4   Compliance Certificate................................................. 12
       5.5   Qualifications......................................................... 13
       5.6   Proceedings and Documents.............................................. 13
       5.7   Opinion of Company Counsel............................................. 13
       5.8   Board of Directors..................................................... 15
       5.9   Amendment of Bylaws.................................................... 15
       5.10  Stockholders' Agreement................................................ 15
       5.11  Consents and Approvals................................................. 15
       5.12  Compliance with Securities Laws........................................ 15
       5.13  No Adverse U.S. Legislation, Action or Decision........................ 15
       5.14  Intercompany Obligations............................................... 16

Section 6. Conditions of the Company's Obligations at Closing....................... 16

       6.1   Representations and Warranties......................................... 16
       6.2   Payment of Purchase Price.............................................. 16
       6.3   Opinion of Investor Counsel............................................ 16
       6.4   Consents and Approvals................................................. 17

Section 7. Registration Rights...................................................... 17

       7.1   Certain Definitions.................................................... 17
       7.2   Demand Registration.................................................... 18
       7.3   Company Registration................................................... 20
       7.4   Expenses of Registration............................................... 21
       7.5   Registration Procedures................................................ 21
       7.6   "Market Stand-Off" Agreement........................................... 21
       7.7   Indemnification........................................................ 21
       7.8   Information by Investor................................................ 23
       7.9   Rule 144 Reporting..................................................... 23
       7.10  Transfer and Expiration of Registration Rights......................... 24

Section 8. Investor's Right of First Refusal........................................ 24

       8.1   Right of First Refusal................................................. 24
       8.2   Notice and Closing..................................................... 26
       8.3   Waiver................................................................. 26

Section 9. Board Representation and Voting Agreement................................ 26
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      9.1    Board Representation Prior to Initial Public Offering............. 26
      9.2    Board Representation After Initial Public Offering................ 27
      9.3    Vacancy........................................................... 27
      9.4    Voting Agreement.................................................. 27

Section 10.  Certain Covenants of the Investor................................. 27

      10.1   Limitation on Ownership of Voting Stock of the Company............ 27
      10.2   Limitations on Ownership of Voting Stock of Catalytica............ 27
      10.3   Restrictions on Transfer of Voting Stock.......................... 28
      10.4   No Sale or Transfer in First Year................................. 29

Section 11.  Investor's Option to Purchase Additional Shares................... 29

      11.1   Option to Purchase................................................ 29

Section 12.  Company Right of First Refusal.................................... 29

      12.1   Company Right of First Refusal.................................... 29
      12.2   Assignment of Rights.............................................. 30

Section 13.  Certain Definitions and Termination of Covenants.................. 30

      13.1   Certain Definitions............................................... 30
      13.2   Termination of Covenants.......................................... 31

Section 14.  Information Rights................................................ 32

      14.1   Annual and Quarterly Financial Information........................ 32
      14.2   Confidentiality of Information.................................... 32
      14.3   Assignment of Information Rights.................................. 32
      14.4   Termination....................................................... 32

Section 15.  Additional Covenants of Catalytica and the Company................ 33

      15.1   Stock to be Reserved.............................................. 33
      15.2   Use of Proceeds................................................... 33
      15.3   Intercompany Obligations.......................................... 33

Section 16.  Miscellaneous..................................................... 33

      16.1   Survival of Warranties............................................ 33
      16.2   Successors and Assigns............................................ 33
      16.3   Governing Law..................................................... 34
      16.4   Counterparts...................................................... 34
      16.5   Titles and Subtitles.............................................. 34
      16.6   Notices........................................................... 34
      16.7   Finder's Fee...................................................... 34
      16.8   Expenses.......................................................... 34
      16.9   Amendment and Waivers............................................. 34
      16.10  Severability...................................................... 34
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      <S>                                                                       <C>
      16.11  Aggregation of Stock.............................................. 35
      16.12  Affiliates and Subsidiaries....................................... 35
      16.13  Saturday, Sundays, Holidays, etc.................................. 35
</TABLE>

EXHIBITS

     A    Amended and Restated Certificate of Incorporation

     B    Schedule of Exceptions

     C    Schedule of Insurance

     D    Stockholders' Agreement

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                           STOCK PURCHASE AGREEMENT

   THIS STOCK PURCHASE AGREEMENT (the "Stock Purchase Agreement") is made as
of the 9th day of December, 1997, by and between Catalytica Combustion Systems,
Inc., a Delaware corporation (the "Company"), Catalytica, Inc., a Delaware
corporation ("Catalytica") and Enron Ventures Corp., a Delaware corporation and
any Affiliated Transferees (as defined below) (collectively, the "Investor" or
"Enron").

                                  Section 1.
                                 Authorization
                                 -------------

   1.1    Authorization of Series B Preferred Stock.  On or before the Closing
          -----------------------------------------
Date, the Company will have authorized the sale and issuance to the Investor of
(a) 2,000,000 shares of its Series B Preferred Stock (the "Series B Preferred"),
having the rights, preferences, privileges and restrictions set forth in the
Company's Amended and Restated Certificate of Incorporation in the form attached
hereto as Exhibit A (the "Restated Certificate").
          ---------

   1.2    Sale of Series B Preferred Stock.  Subject to the terms and conditions
          --------------------------------
hereof, the Company will issue and sell to the Investor, and the Investor will
purchase from the Company, 1,339,286 shares of Series B Preferred, at a per
share purchase price of $22.40, for an aggregate purchase price of $30,000,000.

                                  Section 2.
                            Closing Date; Delivery
                            ----------------------

   2.1    Closing Date.  The closing of the purchase and sale of the Series B
          ------------
B Preferred hereunder (the "Closing") shall be held at the offices of Wilson
Sonsini Goodrich & Rosati, 650 Page Mill Road, Palo Alto, California, at 10:00
a.m. on January 14, 1998, or at such other time and place upon which the Company
and the Investor shall mutually agree. The date of the Closing shall hereinafter
be referred to as the "Closing Date."

   2.2    Delivery.  At the Closing, the Company will deliver to the Investor a
          --------
certificate or certificates representing the number of shares of Series B
Preferred purchased by the Investor against payment of the purchase price
therefor by wire transfer made pursuant to the Company's instructions.

                                  Section 3.
         Representations and Warranties of the Company and Catalytica
         ------------------------------------------------------------

   Except as set forth on the Schedule of Exceptions attached hereto as
Exhibit B (the "Schedule of Exceptions"), which exceptions shall be deemed
---------
representations and

                                       1
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warranties hereunder, the Company and Catalytica, jointly and severally, hereby
represent and warrant to the Investor as follows:

   3.1    Organization, Good Standing and Qualification.  The Company and
          ---------------------------------------------
Catalytica are corporations duly organized, validly existing and in good
standing under the laws of the State of Delaware and have all requisite
corporate power and authority to carry on their respective businesses as now
conducted and as proposed to be conducted. Each subsidiary of the Company and
Catalytica is duly organized, validly existing and in good standing under the
laws of the jurisdiction of incorporation or organization and has all requisite
corporate power and authority to carry on its respective business as now
conducted and as proposed to be conducted.  The Company and Catalytica and each
of their subsidiaries are duly qualified to transact business and are in good
standing in each jurisdiction in the United States in which the failure so to
qualify would have a material adverse effect on their respective businesses or
properties.

   3.2    Capitalization.
          --------------

          (i)  The authorized capital stock of the Company consists of:

               (a) Capital Stock.  9,000,000 shares of Preferred Stock, $.001
                   -------------
par value, 7,000,000 of which are designated as Series A Preferred Stock, all of
which are issued and outstanding, 2,000,000 of which are designated as Series B
Preferred Stock, none of which are issued and outstanding and 10,250,000 shares
of Common Stock, $.001 par value, of which 500,000 shares were issued and
outstanding as of November 30, 1997. All of the issued and outstanding shares of
Capital Stock have been duly authorized and validly issued and are fully paid
and nonassessable.

               (b) Reserved Shares.  The Company has reserved 7,000,000 shares
                   ---------------
of Common Stock for issuances upon conversion of the Series A Preferred Stock,
2,000,000 shares of Common Stock for issuance upon conversion of the Series B
Preferred Stock (all of which are reserved for issuance to the Investor) and
819,000 shares of Common Stock for issuance pursuant to the Company's 1995 Stock
Plan, under which options are outstanding to purchase 803,458 shares of the
Company's Common Stock. There are no other outstanding options, warrants,
rights, including conversion or preemptive rights, or agreements for the
purchase or acquisition from the Company of any shares of its capital stock.

          (ii) The authorized capital stock of Catalytica consists of:

               (a) Capital Stock.  120,000,000 shares of common Stock, $001 par
                   -------------
value, of which 27,791,268 shares are issued and outstanding as of November 30,
1997, 5,000,000 shares of undesignated preferred stock, none of which are issued
or outstanding as of the date hereof, options to purchase 2,876,784 shares of
Common Stock as of November 30, 1997, and 30,000,000 shares of Class A and
17,000,000 shares of

                                       2
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Class B Common Stock, of which 13,270,000 and 11,730,000, respectively, are
issued and outstanding as of November 30, 1997. All of the issued and
outstanding shares of Capital Stock of Catalytica have been duly authorized and
validly issued and are fully paid and nonassessable.

               (b) Reserved Shares.  Catalytica has reserved a sufficient
                   ---------------
number of shares of Common Stock, as adjusted from time to time, for issuance
upon the conversion of the Class A and Class B Common Stock, 17,000,000 shares
of Class A Common Stock for issuance upon the conversion of the Class B Common
Stock, a number of shares of Common Stock sufficient, as adjusted from time to
time, for issuance upon the exchange of the 250,000 Catalytica Pharmaceuticals
shares of Series 1 Junior Preferred held by Glaxo Wellcome, a number of shares
of Common Stock sufficient, as adjusted from time to time, for issuance upon the
exchange of the 150,000 shares of Series B Preferred Stock of Catalytica
Pharmaceuticals held by Pfizer, a number of shares sufficient, as adjusted from
time to time, for issuance upon the exchange of the 2,000,000 shares of Series B
Preferred Stock issuable to Enron in connection with this Agreement, 2,000,000
shares of Common Stock for issuance upon the exercise of that certain warrant
dated July 31, 1997 held by Glaxo Wellcome, and 4,611,946 shares of Common Stock
issuable pursuant to the Catalytica's equity compensation plans under which
options or other rights are outstanding to purchase 1,869,554 shares of the
Catalytica's Common Stock. There are no other outstanding options, warrants,
rights, including conversion of preemptive rights, or agreements for the
purchase or acquisition from Catalytica of any shares of its capital stock.

   3.3    Subsidiaries.  Except for GENXON Power Systems, LLC and Advanced
          ------------
Sensor Devices, Inc., the Company does not presently own or control, directly or
indirectly, any interest in any other corporation, association, partnership or
other business entity.

   3.4    Authorization.  All corporate action on the part of the Company and
          -------------
Catalytica, their respective officers, directors and stockholders necessary for
(i) the authorization, execution and delivery of this Agreement and the
Stockholders' Agreement; (ii) the performance of all obligations of the Company
and Catalytica hereunder and thereunder; and (iii) the authorization, issuance
and delivery of the Series B Preferred (and the Common Stock underlying the
Series B Preferred) being sold hereunder, to the extent that the foregoing
requires performance on or prior to the Closing, has been taken or will be taken
on or prior to the Closing, and this Agreement and the Stockholders' Agreement
constitute the valid and legally binding obligations of the Company and
Catalytica, enforceable against each of the Company and Catalytica, as the case
may be, in accordance with their respective terms, subject to laws of general
application relating to bankruptcy, insolvency and the relief of debtors and
rules of law governing specific performance, injunctive relief or other
equitable remedies and except insofar as the enforceability of the
indemnification provisions of Section 7.7 of this

                                       3
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Agreement may be limited by applicable laws. The execution of this Agreement and
the Stockholders' Agreement and the performance of the transactions contemplated
by this Agreement and the Stockholders' Agreement by each of the Company and
Catalytica will not violate any provision of law and will not conflict with or
result in any breach of any of the terms, conditions or provisions of, or
constitute a default under, or require a consent or waiver under (with or
without the passage of time or filing of notice) their respective Certificates
of Incorporation or Bylaws (each as amended or restated to date) or any material
agreement or other instrument to which the Company or Catalytica or any of their
subsidiaries are a party or by which they or any of their properties are bound.

   3.5    Valid Issuance.  The Series B Preferred which is being purchased by
          --------------
the Investor hereunder, when issued, sold or delivered in accordance with the
terms hereof, for the consideration expressed herein, and the shares of Common
Stock issuable upon conversion of the Series B Preferred in accordance with the
terms of the Restated Certificate, will be duly and validly issued, fully paid
and nonassessable and, based in part upon the representations of the Investor in
this Agreement, will be issued in compliance with all applicable federal and
state securities laws.

   3.6    Governmental Consents.  No consent, approval, order or authorization
          ---------------------
of, or registration, qualification, designation, declaration or filing with, any
federal, state, local or provincial governmental authority other than as
required under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended, and the rules and regulations thereunder (the "HSR Act") on the part of
the Company or Catalytica is required in connection with the consummation of the
transactions contemplated by this Agreement, except for any post-sale filing
pursuant to applicable state and federal securities laws, which the Company
undertakes to file within the applicable time periods.

   3.7    Litigation.  There is no action, suit, proceeding or investigation
          ----------
pending or to the knowledge of the Company or Catalytica currently threatened
against the Company or Catalytica or any of their subsidiaries which questions
the validity of this Agreement or the Stockholders' Agreement or the right of
the Company or Catalytica to enter into this Agreement and the Stockholders'
Agreement, or to consummate the transactions contemplated by this Agreement or
the Stockholders' Agreement, or which might result, either individually or in
the aggregate, in any material adverse change in the business, properties,
financial condition or operating results of either the Company or Catalytica, as
such businesses are presently conducted, or in any change in the current equity
ownership of the Company or Catalytica, nor is the Company or Catalytica aware
that there is any basis for the foregoing. The foregoing includes, without
limitation, actions pending or threatened (or any basis therefor known to the
Company or Catalytica) involving the prior employment of any of the Company's,
Catalytica's or any of their subsidiaries' employees, their use in connection
with the Company's, Catalytica's or any of their subsidiaries business of any
information or technology allegedly proprietary to any of their former
employees, or their obligations under any agreements with prior employers.

                                       4
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Neither the Company, Catalytica nor any of their subsidiaries is a party or
subject to the provisions of any order (except as imposed by laws of general
application), writ, injunction, judgment or decree (except as imposed by laws of
general application) of any court or government agency or instrumentality. There
is no action, suit, proceeding or investigation by the Company, Catalytica or
any of their subsidiaries currently pending or which the Company, Catalytica or
any of their subsidiaries intends to initiate.

   3.8    Patents and Trademarks.  To the Company's knowledge, the Company has
          ----------------------
sufficient rights, title and ownership of all patents, trademarks, service
marks, trade names, copyrights, trade secrets, information and proprietary
rights necessary for its business as now conducted (which shall be deemed for
purposes of this Agreement to include the manufacturing and installation of the
XONON combustion system in current generation turbines, next generation
turbines, and out-of-warranty turbines world wide) (the "Intellectual
Property").  Catalytica transferred to the Company all of Catalytica's right,
title and interest to the Intellectual Property.  Exhibit B sets forth (a) a
list of the patents, patent applications, trademarks or service marks issued to,
assigned to or filed by the Company, identifying any such Intellectual Property
which is jointly held with a third party and (b) a list of any licenses or
agreements between the Company and a third party with respect to any of the
Intellectual Property.  The Company is not aware that any of its employees are
obligated under any contract (including employee agreements, licenses, covenants
or commitments of any nature) or other agreement, or subject to any judgment,
decree (except as imposed by laws of general application) of any court or
administrative agency, that would interfere with the use of his or her best
efforts to promote the interests of the Company, or that would conflict with the
Company's business as now conducted, or that has resulted in notification from
an obligee of any such contract to the Company regarding concerns about an
employee's compliance with such contract. To the Company's knowledge, there are
no third party claims, demands or causes of action alleging that either the
Company or any of its subsidiaries does not have the right to exploit all or a
part of the Intellectual Property on a world wide basis or alleging that such
third party also has the right to exploit such Intellectual Property.

   3.9    Compliance with Other Instruments.  Exhibit B sets forth a list of all
          ---------------------------------
material instruments and contracts to which the Company or any of its
subsidiaries is a party by which either is bound and the Company has made each
of such contracts and instruments available to the investor.  Neither the
Company nor any of its subsidiaries is in violation or default of any provisions
of its Certificate of Incorporation or Bylaws or of any judgment, order, writ or
decree by which it is bound.  Neither the Company nor any of its subsidiaries is
in violation or default of any material instrument or material contract to which
it is a party or by which it is bound, or of any provision of any federal or
state statute (including without limitation environmental and labor laws and
filing requirements under the Employee Retirement Income Security Act of 1974),
rule or regulation applicable to the Company, which violation or default would
be materially adverse to the Company, its business or its properties.

                                       5
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   3.10   Registration Rights.  Except as provided in Section 7 of this
          -------------------
Agreement or as set forth in Exhibit B, the Company has not granted or agreed to
grant any registration rights, including piggyback rights, to any person or
entity.

   3.11   Title to Property and Assets.  Except as disclosed in Exhibit B, each
          ----------------------------
of the Company and its subsidiaries has good and marketable title to and owns
its property and assets free and clear of all mortgages, liens, loans and
encumbrances, except such encumbrances and liens listed in Exhibit B which arise
in the ordinary course of business and do not materially impair the Company's or
its subsidiaries' ownership or use of such property or assets or materially
detract from the value of such property or assets.  With respect to the property
and assets it leases, each of the Company and its subsidiaries is in compliance
with such leases in all material respects and, to the Company's knowledge, holds
a valid leasehold interest free of any material liens, claims or encumbrances.

   3.12   Employee Benefit Plans.  Except as disclosed in Exhibit B, neither the
          ----------------------
Company nor any of its subsidiaries have any Employee Benefit Plans as described
in Section 3(2)(A) or Section 3(2)(B) of the Employee Retirement Income Security
Act of 1974 ("ERISA").  Neither Catalytica, the Company nor any of their
subsidiaries has incurred any liability to the PBGC (other than annual premiums
due to the PBGC) or a Pension Plan under Title IV of ERISA.

   3.13   Tax Return and Payments.  Except as disclosed in Exhibit B, the
          -----------------------
Company and Catalytica have timely filed all tax returns and reports as required
by law, or the appropriate information for the Company was included in the
consolidated tax returns and reports of Catalytica.  These returns and reports
are true and correct in all material respects.  The Company and Catalytica have
paid all taxes and other assessments due prior to the time penalties would
accrue thereon.  The provision for taxes of the Company and Catalytica are
adequate for taxes due or accrued as of the date thereof.  The Company and
Catalytica have not been notified by any federal or state taxing authority of
any audit of the tax returns of the Company or Catalytica for any tax year.

   3.14   Insurance.  Each of the Company and its subsidiaries has in full force
          ---------
and effect the insurance policies, with coverage amounts and as summarized in
the Schedule of Insurance attached hereto as Exhibit C.

   3.15   Labor Agreements and Actions.  Except as disclosed in Exhibit B,
          ----------------------------
neither the Company nor any of its subsidiaries is bound by or subject to (and
none of its assets or properties is bound by or subject to) any written or oral,
express or implied, contract, commitment or arrangement with any labor union,
and no labor union has requested or, to the knowledge of the Company, has sought
to represent any of the employees of the Company or its subsidiaries.  There is
no strike or other labor dispute involving the Company or its subsidiaries
pending or to the knowledge of the Company threatened, which could have a
material adverse effect on the business, properties, financial

                                       6
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condition, operating results of the Company, nor is the Company aware of any
labor organization activity involving employees of the Company or its
subsidiaries.

   3.16   Financial Statements.  The Company has delivered to Investor its
          --------------------
statement of operations for the years ended December 31,1994 and 1995 and its
unaudited financial statements (balance sheet and statement of operations, which
together constitute the "Financial Statements") for the year ended December 31,
1996 and for the fiscal quarter ended September 30, 1997.  Catalytica has also
delivered audited financial statements for the year ended December 31, 1996 and
unaudited financial statements for the fiscal quarter ended September 30, 1997
(the "Catalytica Financial Statements").  The Financial Statements and the
Catalytica Financial Statements are complete and correct in all material
respects, subject to normal year-end adjustments, and have been prepared in
accordance with generally accepted accounting principles consistently applied
(except no footnotes have been prepared for the Financial Statements and the
Catalytica Financial Statements for the quarter ended September 30, 1997).  The
Financial Statements and the Catalytica Financial Statements accurately set out
and describe the financial condition and operating results of the Company and
Catalytica as of the dates, and for the period, indicated therein, subject to
normal year-end audit adjustments.  Except as set forth in the Financial
Statements and the Catalytica Financial Statements, neither the Company nor
Catalytica have any liabilities, contingent or otherwise, required to be set
forth therein under generally accepted accounting principles other than
liabilities incurred in the ordinary course of business subsequent to the end of
the latest fiscal quarter which, individually or in the aggregate, are not
material to the financial condition or operating results of the Company or
Catalytica.  Each of Catalytica's and the Company's system of accounting and
internal controls has been established and administered in accordance with
generally accepted accounting principles.

   3.17   Changes.  Except as disclosed in Exhibit B, since September 30, 1997,
          -------
there has not been:

          (a) any change in the assets, liabilities, financial condition or
operating results of the Company or Catalytica from that reflected in the
Financial Statements and the Catalytica Financial Statements, except changes in
the ordinary course of business which have not been, in the aggregate,
materially adverse and except that the Company has continued to incur operating
losses;

          (b) any damage, destruction or loss, whether or not covered by
insurance, materially and adversely affecting the assets, properties, financial
condition, operating results, or business of the Company or Catalytica as such
businesses are presently conducted;

          (c) any waiver by the Company or Catalytica of a valuable right or of
a material debt owed to it;

                                       7
<PAGE>

          (d) any satisfaction or discharge of any lien, claim or encumbrance or
payment of any obligation by the Company or Catalytica, except in the ordinary
course of business and which is not material to the assets, properties,
financial condition, operating results or business of the Company or Catalytica
as such business is presently conducted;

          (e) any change or amendment to or termination of a material contract
or arrangement by which the Company or Catalytica or any of their respective
assets or properties is bound or subject;

          (f) to the Company's and Catalytica's knowledge, any other event or
condition of any character which has, or could reasonably be expected to,
materially and adversely affect the assets, properties, financial condition or
operating results or business of the Company or Catalytica as such business is
presently conducted;

          (g) any repurchase of the Company's or Catalytica's capital stock or
any agreement executed with respect to the repurchase of any of its capital
stock;

          (h) any payment of dividends; or

          (i) any material agreement not addressed in this Section 3.17(a)-(h)
above.

   3.18   Voting Arrangements.  There are no outstanding stockholder agreements,
          -------------------
voting trusts, proxies or other arrangements among the stockholders of the
Company relating to the voting of their respective shares.

   3.19   Hazardous Materials.
          -------------------

          (a) To the Company's knowledge, neither the Company nor any of its
subsidiaries is in violation of, has been charged with, has received any notice
of and is under investigation for its failure to comply with, any statutes,
laws, ordinances, rules, regulations, orders and directives of any and all
Governmental Agency or Agencies as that term is defined in paragraph (iii) of
this Section 3.19 with respect to the use, generation, storage, transportation,
handling, abandoning, releasing or disposing of any Hazardous Materials, as
defined below, pertaining to the Company or any of its subsidiaries, the real or
personal property or other assets owned or leased by the Company or any of its
subsidiaries, its business or the operation, conduct or occupancy thereof.
Neither the Company nor any of its subsidiaries has previously disposed of any
Hazardous Materials at the real property leased by it or at any real property
leased by it in the past in violation of applicable law.  To the Company's
knowledge, there are no Hazardous Materials currently stored at its leased
property which, in their current state and quantity, are stored in violation of
the Resource Conservation and Recovery Act, 42 U.S.C. Section 6901, et seq. or
any other statute, law, ordinance, rule, regulation, order or directive of any
Governmental Agency or Agencies.

                                       8
<PAGE>

          (b) For the purpose of this Section, the term "Hazardous Materials"
shall include those materials or substances defined as "hazardous substances,"
"hazardous materials," "hazardous waste," or "toxic substances," under the
Comprehensive Environmental Response, Compensation and Liability Act of 1980, as
amended, 42 U.S.C. Section 9601, et seq., the Resource Conservation and Recovery
Act, as amended, 42 U.S.C. Section 6901, et seq., the Hazardous Materials
Transportation Act, 49 U.S.C. 1801, et seq., or regulations promulgated pursuant
thereto.

          (c) For purposes of this Section, the term "Governmental Agency or
Agencies" means any federal, state or local government, political subdivision,
court, agency or other entity, body, organization or group legally empowered and
exercising any executive, legislative, judicial, quasi-judicial, regulatory or
administrative function or government.

          (d) To the knowledge of Catalytica, the representations and warranties
to Catalytica's subsidiary Catalytica Pharmaceuticals, Inc., from Glaxo
Wellcome, Inc. contained in Section 4.22 of the Asset Purchase Agreement for the
purchase of the Greenville Facility would be materially true and correct if made
on the date hereof subject to the exceptions thereto in the Asset Purchase
Agreement; provided however, certain Environmental Reports (as defined in
Section 4.22(f) of the Asset Purchase Agreement) have been generated since the
date of the Asset Purchase Agreement in accordance with the terms of the Asset
Purchase Agreement.

   3.20   Agreements with Affiliates.  Except as set forth on Exhibit B, neither
          --------------------------
the Company nor any of its subsidiaries is a party to any material contract or
agreement with, or any other commitment to, any Affiliate of Catalytica, the
Company or any of their Subsidiaries which contract, agreement or commitment is
on terms that are less favorable to the Company or its subsidiaries than those
that would have been obtainable in a good faith arm's-length transaction at the
time from any reasonable person who was not such an Affiliate.

   3.21   Holding Company and Investment Company Status.  Neither Catalytica,
          ---------------------------------------------
the Company nor any of their subsidiaries is a "holding company," or a
"subsidiary company" of a "holding company," or an "affiliate" of a "holding
company" or of a "subsidiary company" of a "holding company," or a "public
utility," within the meaning of the Public Utility Holding Company Act of 1935,
as amended, or a "public utility" within the meaning of the Federal Power Act,
as amended.  Neither Catalytica, the Company nor any of their subsidiaries is,
or upon the sale of the Series B Preferred Stock will be, an "investment
company" or a company "controlled" by an "investment company" within the meaning
of the Investment Company Act of 1940, as amended, or an "investment adviser"
within the meaning of the Investment Advisers Act of 1940, as amended.

                                       9
<PAGE>

   3.22   Possession of Franchises, Licenses, Etc.  The Company and its
          ---------------------------------------
subsidiaries possess all material franchises, certificates, licenses, permits
and other authorizations from governmental political subdivisions or regulatory
authorities, free from burdensome restrictions, that are necessary for the
ownership, maintenance and operation of its properties and assets, and neither
the Company nor any of its subsidiaries is in violation of any thereof which
violation would have a material adverse effect on the business or financial
condition of the Company.

                                  Section 4.
           Representations, Warranties and Covenants of the Investor
           ---------------------------------------------------------

     The Investor hereby represents, warrants and covenants to the Company and
Catalytica with respect to the purchase of the Series B Preferred (and the
Common Stock underlying the Series B Preferred) and as of the Closing as
follows:

   4.1    Authorization.  This Agreement constitutes its valid and legally
          -------------
binding obligation, enforceable in accordance with its terms, subject to laws of
general application relating to bankruptcy, insolvency and the relief of debtors
and rules of law governing specific performance, injunctive relief or other
equitable remedies and except insofar as the enforceability of the
indemnification provisions of Section 7.7 of this Agreement may be limited by
applicable laws.

   4.2    Purchase Entirely for Own Account.  The Series B Preferred (and the
          ---------------------------------
Common Stock underlying the Series B Preferred) to be purchased by such Investor
under this Agreement will be acquired for investment for such Investor's own
account, not as a nominee or agent, and not with a view to the resale or
distribution of any part thereof, and such Investor has no present intention of
selling, granting any participation in, or otherwise distributing the same.  By
executing this Agreement, Investor further represents that such Investor does
not have any contract, undertaking, agreement or arrangement with any person to
sell, transfer or grant participation to such person or to any third person,
with respect to any of the Series B Preferred (and the Common Stock underlying
the Series B Preferred) purchased hereunder.  Investor represents that it has
full power and authority to enter into this Agreement.

   4.3    Disclosure of Information.  Investor believes it has received all the
          -------------------------
information it considers necessary or appropriate for deciding whether to
purchase shares of the Series B Preferred (and the Common Stock underlying the
Series B Preferred).  Investor further represents that it has had an opportunity
to ask questions and receive answers from the Company regarding the terms and
conditions of the sale of the Series B Preferred (and the Common Stock
underlying the Series B Preferred). The foregoing, however, does not limit or
modify the representations and warranties of the Company and Catalytica in
Section 3 of this Agreement.

                                       10
<PAGE>

   4.4    Investment Experience.  Investor is an investor in securities of
          ---------------------
companies at similar stages of development and acknowledges that it can bear the
economic risk and complete loss of its investment and has such knowledge and
experience in financial and business matters that it is capable of evaluating
the merits and risks of the investment in the Series B Preferred (and the Common
Stock underlying the Series B Preferred). Investor also represents it has not
been organized solely for the purpose of acquiring the Series B Preferred (and
the Common Stock underlying the Series B Preferred).

   4.5    Restricted Securities.  Investor understands that the Series B
          ---------------------
Preferred (and the Common Stock underlying the Series B Preferred) it is
purchasing are characterized as "restricted securities" under the federal
securities laws inasmuch as they are being acquired from the Company in a
transaction not involving a public offering and that under such laws and
applicable regulations such securities may be resold without registration under
the Securities Act of 1933, as amended (the "Securities Act"), only in certain
limited circumstances.  In this connection Investor represents that it is
familiar with United States SEC Rule 144, as presently in effect, and
understands the resale limitations imposed thereby and by the Securities Act.

   4.6    Further Limitations on Disposition.  Without in any way limiting the
          ----------------------------------
representations set forth above, Investor further agrees not to make any
disposition of all or any portion of the Series B Preferred (or the Common Stock
underlying the Series B Preferred) unless and until:

          (a) There is then in effect a Registration Statement under the
Securities Act covering such proposed disposition and such disposition is made
in accordance with such Registration Statement; or

          (b) (i) Such Investor shall have notified the Company of the proposed
disposition and shall have furnished the Company with a detailed statement of
the circumstances surrounding the proposed disposition, and (ii) if reasonably
requested by the Company, such Investor shall have furnished the Company with an
opinion of counsel, reasonably satisfactory to the Company and its counsel, that
such disposition will not require registration of such shares under the
Securities Act.  It is agreed that the Company will not require opinions of
counsel for transactions made pursuant to Rule 144, as currently in existence,
except in unusual circumstances.

   4.7    Legends.  It is understood that the certificates evidencing the Series
          -------
B Preferred (and the Common Stock underlying the Series B Preferred) purchased
by the Investor may bear one or all of the following legends or similar legends:

          (a) "These securities have not been registered under the Securities
Act of 1933. They may not be sold, offered for sale, pledged or hypothecated in
the absence of a registration statement in effect with respect to the securities
under such Act or an

                                       11
<PAGE>

opinion of counsel satisfactory to the Company that such registration is not
required or unless sold pursuant to Rule 144 of such Act."

          (b) If required by the authorities of any state in connection with the
issuance or sale of the Series B Preferred (or the Common Stock underlying the
Series B Preferred), the legend required by such state authority.

          (c) "These securities are subject to restrictions on transfer and
rights of first refusal set forth in the Stock Purchase Agreement between the
Company and the holder, and in the Stockholders' Agreement among the Company,
Catalytica, Inc. and the holder, copies of which are available from the
secretary of the Company."

   4.8    Accredited Investor.  Investor is an accredited investor as defined in
          -------------------
Rule 501(a) of Regulation D, as amended, of the SEC under the Securities Act.

                                  Section 5.
                Conditions of Investor's Obligations at Closing
                -----------------------------------------------

     The obligations of Investor under this Agreement are subject to the
fulfillment on or before the Closing Date of each of the following conditions,
the waiver of which shall not be effective if such investor does not consent in
writing thereto:

   5.1    Representations and Warranties.  The representations and warranties of
          ------------------------------
the Company and Catalytica contained in Section 3 shall be true in all material
respects on and as of the Closing Date with the same effect as though such
representations and warranties had been made on and as of such date.

   5.2    Performance.  The Company shall have performed and complied in all
          -----------
material respects with all agreements, obligations and conditions contained in
this Agreement that are required to be performed or complied with by it on or
before the Closing.

   5.3    No Material Adverse Change.  There shall have been no material adverse
          --------------------------
change in the business, properties, financial condition or operating results of
the Company or Catalytica since the close of the latest fiscal quarter, except
that the Company has continued to incur operating losses.

   5.4    Compliance Certificate.  The President or a Vice President of the
          ----------------------
and Catalytica shall deliver to Investor at the Closing a certificate (in form
satisfactory to Investor) on behalf of the Company and Catalytica certifying
that the conditions specified in Sections 5.1, 5.2 and 5.3 have been fulfilled
and stating that, except as set forth in the Schedule of Exceptions hereto,
there has been no material adverse change in the business, properties, financial
condition or operating results of the Company or Catalytica since the

                                       12
<PAGE>

close of the latest fiscal quarter, except that the Company has continued to
incur operating losses.

   5.5    Qualifications.  All applicable state securities administrators shall
          --------------
have issued a permit qualifying the offer and sale of the Series B Preferred
Stock and the underlying Common Stock to the investor pursuant to this
Agreement, or such offer and sale shall be exempt from such qualification under
the applicable state securities laws.

   5.6    Proceedings and Documents.  All corporate and other proceedings in
          -------------------------
connection with the transactions contemplated at the Closing and all documents
incident thereto shall be reasonably satisfactory in form and substance to the
Investor, and it shall have received all such counterpart original and certified
or other copies of such documents as it may reasonably request.

   5.7    Opinion of Company Counsel.  Investor shall have received from Wilson
          --------------------------
Sonsini Goodrich & Rosati, P.C., counsel for the Company and Catalytica, an
opinion dated as of the Closing Date, in form and substance reasonably
satisfactory to the Investor, to the effect that:

          (a) The Company and Catalytica are corporations duly organized,
validly existing and in good standing under the laws of the State of Delaware,
and the Company and Catalytica have all requisite corporate power and authority
to own their respective properties and to conduct their respective businesses as
presently conducted.

          (b) The Company and Catalytica are qualified to do business as foreign
corporations in the State of California.

          (c) The Company and Catalytica have all requisite corporate power and
authority to execute, deliver and perform this Agreement and the Stockholders'
Agreement. This Agreement and the Stockholders' Agreement have been duly and
validly authorized by the Company and Catalytica, duly executed and delivered by
an authorized officer of the Company and Catalytica, and are valid and
enforceable in accordance with their terms subject to laws of general
application relating to bankruptcy, insolvency and the relief of debtors and
rules of law governing specific performance, injunctive relief or other
equitable remedies and except insofar as the enforceability of the
indemnification provisions of Section 7.7 of this Agreement may be limited by
applicable laws.

          (d) The authorized capital stock of the Company is as follows:
9,000,000 shares of Preferred Stock, $.001 par value, of which 7,000,000 shares
have been designated Series A Preferred Stock, and 2,000,000 have been
designated Series B Preferred and 10,250,000 shares of Common Stock, $.001 par
value.

                                       13
<PAGE>

          (e) The authorized capital stock of Catalytica is as follows:
5,000,000 shares of undesignated Preferred Stock, 120,000,000 shares of common
stock, of which 73,000,000 shares are designated Common Stock, 30,000,000 shares
are designated Class A Common Stock, and 17,000,000 shares are designated Class
B Common Stock. The par value of the common stock and the Preferred Stock is
$.001 per share.

          (f) The certificates representing the Series B Preferred are in due
and proper form and have been duly and validly executed by the authorized
officers of the Company named thereon. The Series B Preferred purchased under
this Agreement, when issued, sold and delivered against payment therefor in
accordance with the provisions of this Agreement, and the shares of Common Stock
and the shares of Common Stock of Catalytica, as the case may be, issuable upon
conversion of the Series B Preferred in accordance with the terms of the
Restated Certificate and the Stockholders' Agreement, as the case may be, will
be duly and validly issued, fully paid and non-assessable.

          (g) The execution, delivery and performance and compliance with the
terms of this Agreement and the Stockholders' Agreement by the Company and
Catalytica (provided that no opinion is expressed as to the indemnification
provisions of Section 7.7 of this Agreement) do not violate any provision of the
Company's or Catalytica's Certificate of Incorporation or Bylaws, or, to such
counsel's knowledge, do not violate any provision of any applicable federal or
state law, rule or regulation and, to such counsel's knowledge, do not conflict
with or constitute a default under the provisions of any judgment, writ, decree,
order or material agreement known to such counsel to which the Company or
Catalytica is a party or by which they are bound, which violation, conflict or
default would be materially adverse to the Company or Catalytica.

          (h) All consents, approvals, orders or authorizations of, and all
qualifications, registrations, designations, declarations or filings with, any
federal or state governmental authority on the part of the Company and
Catalytica (other than by federal or state securities laws which are covered in
Section (h) below) required to be made prior to the Closing in connection with
the consummation of the transactions contemplated by this Agreement have been
obtained, and are effective, as of the Closing and there are no proceedings, or,
to such counsel's knowledge, threat thereof, which question their validity.

          (i) Based in part upon the representations of the Investor, the offer
and sale of the Series B Preferred (and the underlying Common Stock) pursuant to
the terms of this Agreement are exempt from the registration requirements of
Section 5 of the Securities Act of 1933, as amended. Such counsel will express
no opinion as to compliance with applicable Federal or State antifraud statutes,
or statutes, rules or regulations of any applicable state law governing the
issuance of securities.

                                       14
<PAGE>

     The opinion of counsel for the Company and Catalytica under this Section
5.7, shall be qualified by such matters as are set forth in the Schedule of
Exceptions to this Agreement.

     5.8    Board of Directors.  Upon the Closing, the authorized size of the
            ------------------
Board of Directors of the Company shall be eight (8) members and the Board shall
consist of William B. Ellis, William K. Reilly, Fred O'Such, Ricardo B. Levy,
John A. Urquhart, Dennis A. Orwig, Lawrence W. Briscoe and Thomas E. White, Jr.

     5.9    Amendment of Bylaws.  The Company shall provide evidence of an
            -------------------
amendment to its Bylaws increasing the number of directors to eight (8).

     5.10   Stockholders' Agreement.  The Company, Catalytica and the Investor
            -----------------------
shall have entered into the Stockholders' Agreement in substantially the form
attached hereto as Exhibit D (the "Stockholders' Agreement") and such agreement
                   ---------
shall be in full force and effect and no term or condition thereof shall have
been amended, modified or waived.

     5.11   Consents and Approvals.  All consents from (i) The Chase Manhattan
            ----------------------
Bank, (ii) Morgan Stanley Capital Partners III, L.P., (iii) Mitsubishi Oil,
Ltd., and (iv) other required or mandated orders or notifications of, or
registrations, declarations or filings with, or expiration of waiting periods
imposed by, any applicable Governmental Body in connection with the consummation
of the transactions contemplated by this Agreement shall have been made or
obtained or shall have occurred, including without limitation the expiration or
early termination of the waiting period under the HSR Act.

     5.12   Compliance with Securities Laws.  The offering and sale of the
            -------------------------------
Series B Preferred Stock under this Agreement shall have complied with all
applicable requirements of federal and state securities laws.

     5.13   No Adverse U.S. Legislation, Action or Decision.  Subsequent to the
            -----------------------------------------------
date hereof, no legislation, order, rule, ruling or regulation shall have been
enacted or made by or on behalf of any governmental body, department or agency
of the United States, nor shall any legislation have been introduced and
favorably reported for passage to either House of Congress by any committee of
either such House to which such legislation has been referred for consideration,
nor shall any decision of any court of competent jurisdiction within the United
States have been rendered which would materially and adversely affect Investor's
investment in the Series B Preferred Stock. There shall be no action, suit,
investigation or proceeding, pending or to Catalytica's or the Company's
knowledge threatened, against or affecting Catalytica, the Company or any of
their subsidiaries, or any of their respective properties or rights, or any of
their affiliates, associates, officers or directors, before any court,
arbitrator or administrative or governmental body which (i) seeks to restrain,
enjoin, prevent the consummation of or otherwise affect the transactions
contemplated by this Agreement, or the Stockholders'

                                       15
<PAGE>

Agreement or (ii) questions the validity or legality of any such transaction or
seeks to recover damages or to obtain other relief in connection with any such
transaction, and, to Catalytica's or the Company's knowledge, there shall be no
valid basis for any such action, proceeding or investigation.

     5.14   Intercompany Obligations.  All payables, indebtedness and other
            ------------------------
monetary obligations of the Company or its subsidiaries to Catalytica which are
not being retired or repaid prior to the Closing, shall have been modified as a
contribution of capital upon terms reasonably satisfactory to the Investor.

                                  Section 6.
              Conditions of the Company's Obligations at Closing
              --------------------------------------------------

     The obligations of the Company to Investor under this Agreement are subject
to the fulfillment on or before the Closing of each of the following conditions
by such Investor:

     6.1    Representations and Warranties.  The representations and warranties
            ------------------------------
of the Investor contained in Section 4 hereof shall be true in all material
respects on and as of the Closing with the same effect as though such
representations and warranties had been made on and as of such date.

     6.2    Payment of Purchase Price.  Investor shall have delivered the
            -------------------------
purchase price specified in Section 1 and Investor shall have acquired and paid
for at the Closing the number of shares of Series B Preferred specified in
Section 1 of this Agreement.

     6.3    Opinion of Investor Counsel.  The Company shall have received from
            ---------------------------
the office of the General Counsel for the Investor, an opinion dated as of the
Closing Date, in form and substance reasonably satisfactory to the Company, to
the effect that:

            (a) The Investor is a corporation duly organized, validly existing
and in good standing under the laws of Delaware, and the Investor has all
requisite corporate power and authority to own its properties and to conduct its
business as presently conducted.

            (b) The investor has all requisite corporate power and authority to
execute, deliver and perform this Agreement and the Stockholders Agreement.  The
Agreement and the Stockholders Agreement, have been duly and validly authorized
by the Investor, duly executed and delivered by an authorized officer of the
Investor and are valid and enforceable in accordance with their terms subject to
laws of general application relating to bankruptcy, insolvency and the relief of
debtors and rules of law governing specific performance, injunctive relief or
other equitable remedies and except insofar as the enforceability of the
indemnification provisions of Section 7.7 of this Agreement may be limited by
applicable laws.

                                       16
<PAGE>

          (c) The execution, delivery, performance and compliance with the terms
of this Agreement by the Investor does not violate any provision of any
applicable law, rule or regulation or any provision of the Investor's Charter or
Bylaws and, to such counsel's knowledge, do not conflict with or constitute a
default under the provisions of any judgment, writ, decree, order or material
agreement to which Investor is a party or by which Investor is bound, which
violation, conflict or default would be materially adverse to the Investor.

          (d) All consents, approvals, orders or authorizations of, and all
qualifications, registrations, designations, declarations or filings with, any
federal or state governmental authority on the part of the Investor required to
be made prior to the Closing in connection with the consummation of the
transactions contemplated by this Agreement have been obtained, and are
effective, as of the Closing and such counsel is not aware of any proceedings,
or threat thereof, which question their validity.

   6.4    Consents and Approvals.  All consents from (i) The Chase Manhattan
          ----------------------
Bank, (ii) Morgan Stanley Capital Partners III, L.P., (iii) Mitsubishi Oil,
Ltd., and (iv) other required or mandated orders or notifications of, or
registrations, declarations or filings with, or expiration of waiting periods
imposed by, any applicable Governmental Body in connection with the consummation
of the transactions contemplated by this Agreement shall have been made or
obtained or shall have occurred, including without limitation the expiration or
early termination of the waiting period under the HSR Act.

                                  Section 7.
                              Registration Rights
                              -------------------

   7.1    Certain Definitions.  As used in this Section 7, the following terms
          -------------------
shall have the following respective meanings:

          "Commission" shall mean the Securities and Exchange Commission or any
           ----------
other federal agency at the time administering the Securities Act.

          "Initial Public Offering" shall mean the Company's first underwritten
           -----------------------
offering of its securities registered with the Securities and Exchange
Commission which results in gross proceeds to the Company of at least $20
million.

          "Securities Act" shall mean the Securities Act of 1933, as amended, or
           --------------
any similar federal statute and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

          "Registrable Securities" means (i) shares of the Company's Common
           ----------------------
Stock issued or issuable pursuant to the conversion of the Company's Series B
Preferred Stock, (ii) any Common Stock of the Company issued or issuable in
respect of the shares of the Company's Common Stock or other securities issued
or issuable pursuant to the

                                       17
<PAGE>

conversion of the Series B Preferred Stock upon any stock split, stock dividend,
recapitalization, or similar event and (iii) any Common Stock issued as a
dividend or other distribution.

          The terms "register," "registered" and "registration" refer to a
                     --------    ----------       ------------
registration effected by preparing and filing a registration statement in
compliance with the Securities Act, and the declaration or ordering of the
effectiveness of such registration statement.

          "Registration Expenses" shall mean all expenses incurred by the
           ---------------------
Company in complying with Sections 7.2 and 7.3 hereof, including, without
limitation, all registration, qualification and filing fees, printing expenses,
escrow fees, fees and disbursements of counsel for the Company, blue sky fees
and expenses, and the expense of any regular audits incident to or required by
any such registration (but excluding the compensation of regular employees of
the Company which shall be paid in any event by the Company).

          "Selling Expenses" shall mean all underwriting discounts, selling
           ----------------
commissions and stock transfer taxes applicable to the securities registered by
the Investor and all fees and disbursements of counsel for the Investor.

   7.2    Demand Registration.
          -------------------

          (a) At any time subject to the limitations of paragraphs (c) and (d)
of this Section 7.2, the Investor may by written notice request that the Company
register under the Securities Act all or part of such Investor's Registrable
Securities in accordance with such Investor's intended methods of distribution
as specified in such notice.

          (b) Upon receipt of any notice of a request for registration pursuant
to paragraph (a) above (a "Demand Registration"), the Company will proceed
expeditiously to prepare and file a registration statement on the appropriate
form to permit the sale or transfer of the Registrable Securities requested to
be included by the Investor.

          (c) Notwithstanding the foregoing, (i) the Company shall not be
obligated to file a registration statement relating to a Demand Registration
under this Section 7.2 if counsel to the Company renders an opinion to the
effect that registration under the Securities Act is not required for the
proposed transfer of Registrable Securities, (ii) the Company shall not be
required to effect more than two registrations pursuant to this Section 7.2,
(iii) the Company shall not be required to file any registration statement
pursuant to this Section 7.2 prior to nine (9) months after the Company's
Initial Public Offering and (iv) the Company shall not be required to file a
registration statement relating to a Demand Registration under this Section 7.2
if the amount of Registrable Securities to be sold pursuant to such registration
is less than $7,500,000 in market value at the time the request for such
registration is made to the Company. In addition, the Company may defer the
filing of a registration statement

                                       18
<PAGE>

relating to a Demand Registration if (l) the Company has filed, or is about to
file, a registration statement relating to the offering of or (2) has undertaken
or is about to undertake without a registration statement the offering of
(including, without limitation, a so-called private investment in public equity
securities or "PIPES" offering and an offering pursuant to Rule 144A under the
Securities Act ("Rule 144")) any of the Company's securities (a "Company
Offering"), and the managing underwriter (or placement agent, initial purchaser
or other entity serving in a similar capacity) of the Company Offering in its
sole discretion is of the opinion that the filing of a registration statement
with respect to such Demand Registration could be expected to adversely affect
the Company Offering, including, without limitation, the price at which the
securities to be offered in the Company Offering may be sold; provided, that the
                                                              --------
Company shall use reasonable efforts to file its proposed registration
statement, if applicable, and to commence and complete the Company Offering in a
diligent manner and, in any event, the Company shall not defer the filing of a
registration statement relating to the Demand Registration for more than 120
days from the completion of the Company Offering. Furthermore, the Company may
defer the filing of a registration statement relating to a Demand Registration
for up to 120 days after the request for registration is made if the Board
determines in good faith that such registration would adversely affect or
otherwise interfere with a proposed or pending transaction by the Company,
including, without limitation, a material financing or a corporate
reorganization, or during any period of time in which the Company is in
possession of material inside information concerning the Company or its
securities, which information the Company determines in good faith is not ripe
for disclosure. The Company shall not be required to undergo or pay for any
special audit to effect any registration statement under this Section 7.2, and
if such a special audit would be required in order to file or effect a
registration statement hereunder, the Company shall be entitled to delay the
filing or effectiveness of such registration statement until a reasonable period
of time following the completion of the next audit scheduled in the ordinary
course of the Company's activities; provided, that the Company shall not be
                                    --------
entitled to further defer the filing or effectiveness of such registration
statement if the Investor agrees in writing to pay for the cost of any such
special audit.

          (d) A registration will not count as a registration under paragraph
(a) of this Section 7.2, until it has become effective; provided, that if the
                                                        --------
Investor shall cause or request the Company to withdraw any such registration
statement, the Investor may thereafter request the Company to reinstate such
registration statement, if permitted under the Securities Act, or to file
another Demand Registration, in accordance with the procedures set forth herein,
only upon agreeing in writing to reimburse the Company for all expenses
whatsoever over and above those expenses which the Company would have incurred
had such Demand Registration not been initiated. The Company shall use its best
efforts to maintain the effectiveness of any registration statement relating to
a Demand Registration until the earlier to occur of (x) 120 days after the
effective date of

                                       19
<PAGE>

such registration statement and (y) the date on which all of the Registrable
Securities registered thereunder have been sold.

          (e) If the Investor so notifies the Company, the offering of
Registrable Securities pursuant to any Demand Registration may be in the form of
an underwritten offering, it being understood that the Company shall have no
obligation under this Agreement to cause such offering to be underwritten.

          (f) If a Demand Registration is in the form of an underwritten
offering, the Company shall select and use reasonable efforts to retain the
investment banker or investment bankers and manager or managers that will
administer the offering; provided, that such investment bankers and managers
                         --------
must be reasonably satisfactory to the Investor.

   7.3    Company Registration.
          --------------------

          (a) Notice of Registration.  If at any time the Company shall
              ----------------------
determine to register any of its securities, either for its own account or the
account of a security holder, other than (i) a registration relating solely to
employee benefit plans, (ii) a registration relating solely to a Commission Rule
145 transaction, or (iii) a registration related solely to convertible or non-
convertible debt securities, the Company will:

              (A) promptly give to the Investor written notice thereof; and

              (B) include in such registration (and any related qualification
under blue sky laws or other compliance), and in any underwriting involved
therein, all the Registrable Securities specified in a written request or
requests, made within 15 days after receipt of such written notice from the
Company, by the Investor subject to provisions of Section 7.3(b).

          (b) Underwriting.  If the registration of which the Company gives
              ------------
notice is for a registered public offering involving an underwriting, the
Company shall so advise the Investor as a part of the written notice given
pursuant to this Section 7.3. In such event the right of the Investor to
registration pursuant to this Section 7.3 shall be conditioned upon the
Investor's participation in such underwriting and the inclusion of the
Investor's Registrable Securities in the underwriting to the extent provided
herein. The Investor shall (together with the Company and the other holders
distributing their securities through such underwriting) enter into an
underwriting agreement in customary form with the managing underwriter selected
for such underwriting by the Company. Notwithstanding any other provision of
this Section 7.3, (a) if the registration of which the Company gives notice is
for the Company's Initial Public Offering, the Company may exclude all
Registrable Securities of the Investor if Catalytica determines not to sell any
Registrable Securities for Catalytica's account and provided that none of the
net proceeds to the Company are used to make any payment to Catalytica, and (b)
if the

                                       20
<PAGE>

managing underwriter determines that marketing factors require a limitation of
the number of shares to be underwritten, the underwriter may limit the number of
the Registrable Securities to be included in such registration and underwriting.
In the event of such a limitation by the Managing Underwriter, the Company shall
so advise all holders distributing their securities through such underwriting,
and the number of shares of Registrable Securities that may be included in the
registration and underwriting shall be allocated among all holders thereof,
including the Investor, in proportion, as nearly as practicable, to the
respective amounts of Registrable Securities held by all such holders at the
time of filing the registration statement. If the Investor disapproves of the
terms of any such underwriting, the Investor may elect to withdraw therefrom by
written notice to the Company and the managing underwriter. Any securities
excluded or withdrawn from such underwriting shall be withdrawn from such
registration, but (subject to the greater period referred to in Section 7.6
hereof) shall not be transferred in a public distribution prior to ninety (90)
days after the effective date of the registration statement relating thereto.

   7.4    Expenses of Registration.  All Registration Expenses incurred in
          ------------------------
connection with any registration, qualification or compliance pursuant to
Section 7 shall be borne by the Company.  Unless otherwise stated, all Selling
Expenses relating to securities registered by the Investor shall be borne by the
Investor.

   7.5    Registration Procedures.  In the case of each registration,
          -----------------------
qualification or compliance effected by the Company pursuant to this Section 7,
the Company will keep the Investor advised in writing as to the initiation of
each registration, qualification and compliance and as to the completion
thereof. At its expense the Company will furnish such number of prospectuses and
other documents incident thereto as the Investor from time to time may
reasonably request.

   7.6    "Market Stand-Off" Agreement.  The Investor hereby agrees that it
           ---------------------------
shall not, to the extent requested by the Company and an underwriter of Common
Stock (or other securities) of the Company, sell or otherwise transfer or
dispose of any Registrable Securities (i) during the 180-day period following
the effective date of a registration statement of the Company filed under the
Securities Act in connection with the Company's Initial Public Offering or (ii)
for so long as the Investor holds Registrable Securities equal to or greater
than five percent (5%) of the Total Voting Power of the Company (as defined in
Section 11), during the 90-day period following the effective date of any other
registration statement filed on behalf of the Company with the Securities and
Exchange Commission.

   7.7    Indemnification.
          ---------------

          (a) The Company will indemnify the Investor, each of its officers and
directors and the Investor's legal counsel and independent accountants, and each
person controlling the Investor within the meaning of Section 15 of the
Securities Act, with

                                       21
<PAGE>

respect to which registration, qualification or compliance has been effected
pursuant to this Section 7, and each underwriter, if any, and each person who
controls any underwriter within the meaning of Section 15 of the Securities Act,
against all expenses, claims, losses, damages and liabilities (or actions in
respect thereof), including any of the foregoing incurred in settlement of any
litigation, commenced or threatened, arising out of or based on any untrue
statement (or alleged untrue statement) of a material fact contained in any
registration statement, prospectus, offering circular or other document, or any
amendment or supplement thereto, incident to any such registration,
qualification or compliance, or based on any omission (or alleged omission) to
state therein a material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances in which they were made,
not misleading, or any violation by the Company of any rule or regulation
promulgated under the Securities Act applicable to the Company and relating to
action or inaction required of the Company in connection with any such
registration, qualification or compliance, and will reimburse the Investor, each
of its officers and directors and the Investor's legal counsel and independent
accountants, and each person controlling the Investor, each such underwriter and
each person who controls any such underwriter, for any legal and any other
expenses reasonably incurred in connection with investigating, preparing or
defending any such claim, loss, damage, liability or action, provided that the
Company will not be liable in any such case to the extent that any such claim,
loss, damage, liability or expense arises out of or is based on any untrue
statement or omission or alleged untrue statement or alleged omission, made in
reliance upon and in conformity with written information furnished to the
Company by an instrument duly executed by the Investor or underwriter and stated
to be specifically for use therein or for any settlement of any such actions or
litigation effected without the Company's written consent.

          (b) The Investor will, if Registrable Securities held by the Investor
are included in the securities as to which such registration, qualification or
compliance is being effected, indemnify the Company, each of its directors and
officers and its legal counsel and independent accountants, each underwriter, if
any, of the Company's securities covered by such a registration statement, and
each person who controls the Company or such underwriter within the meaning of
Section 15 of the Securities Act, against all claims, losses, damages and
liabilities (or actions in respect thereof), including any of the foregoing
incurred in settlement of any litigation, commenced or threatened, arising out
of or based on any untrue statement (or alleged untrue statement) of a material
fact contained in any such registration statement, prospectus, offering circular
or other document, or any amendment or supplement thereto, incident to any such
registration, qualification or compliance, or based on any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein in light of the circumstances in which
they were made, not misleading, and will reimburse the Company, its directors,
officers, partners, legal counsel, independent accountants, underwriters or
control persons for any legal or any other expenses reasonably incurred in
connection with investigating or defending any such claim, loss,

                                       22
<PAGE>

damage, liability or action, in each case to the extent, but only to the extent,
that such untrue statement (or alleged untrue statement) or omission (or alleged
omission) is made in such registration statement, prospectus, offering circular
or other document in reliance upon and in conformity with written information
furnished to the Company by an instrument duly executed by the Investor and
stated to be specifically for use therein and provided the Investor will not be
liable for any settlement effected without the Investor's written consent.

          (c) Each party entitled to indemnification under this Section 7.7 (the
"Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought.  The
Company shall be entitled to assume the defense of any such claim or any
litigation resulting therefrom, provided that counsel for the Indemnified Party,
who shall conduct the defense of such claim or litigation, shall be approved by
the Indemnified Party (whose approval shall not unreasonably be withheld).  The
failure of any Indemnified Party to give notice as provided herein shall not
relieve the Indemnifying Party of its obligations under this Section 7, unless
the Indemnifying Party is materially prejudiced by the failure to give notice
promptly.  No Indemnifying Party, in the defense of any such claim or
litigation, shall, except with the consent of each Indemnified Party, consent to
entry of any judgment or enter into any settlement which does not include as an
unconditional term thereof the giving by the claimant or plaintiff to such
Indemnified Party of a release from all liability in respect to such claim or
litigation.

   7.8    Information by Investor.  The Investor shall furnish to the Company
          -----------------------
such information regarding the Investor and the distribution proposed by the
Investor as the Company may request in writing and as shall be required in
connection with any registration, qualification or compliance referred to in
this Section 7.

   7.9    Rule 144 Reporting. With a view to making available the benefits of
          ------------------
certain rules and regulations of the Securities and Exchange Commission which
may at any time permit the sale of the restricted securities to the public
without registration, after such time as a public market exists for the Common
Stock of the Company, the Company agrees to:

          (a) Make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, at all times after
the effective date of the first registration under the Securities Act filed by
the Company for an offering of its securities to the general public;

          (b) Use its best efforts to then file with the Commission in a timely
manner all reports and other documents required of the Company under the
Securities Act and the Securities Exchange Act of 1934, as amended (at any time
after it has become subject to such reporting requirements); and

                                       23
<PAGE>

          (c) So long as the Investor owns any Registrable Securities, to
furnish to the Investor upon request a written statement by the Company as to
its compliance with the reporting requirements of said Rule 144 (at any time
after 90 days after the effective date of the first registration statement filed
by the Company for an offering of its securities to the general public), and of
the Securities Act and of the Securities Exchange Act of 1934 (at any time after
it has become subject to such reporting requirements), a copy of the most recent
annual or quarterly report of the Company, and such other reports and documents
of the Company as the Investor may reasonably request in availing itself of any
rule or regulation of the Securities and Exchange Commission allowing the
Investor to sell any such securities without registration.

   7.10   Transfer and Expiration of Registration Rights.  Other than to an
          ----------------------------------------------
Affiliated Transferee, the rights to cause the Company to register securities
granted the Investor under this Section 7 may not be assigned to a transferee or
assignee in connection with the transfer or assignment of shares of the
Restricted Securities.  The registration rights granted to the Investor under
this Section 7 shall expire when the Investor may sell all its Registrable
Securities in any three month period.

                                   Section 8.
                       Investor's Right of First Refusal
                       ---------------------------------

   8.1    Right of First Refusal.
          ----------------------

          (a) The Company hereby grants to Investor the right of first refusal
to purchase New Securities (as defined in this Section 8) which the Company may,
from time to time, propose to sell and issue up to (i) the amount of Investor's
pro rata share if the purchase price per share is equal to or greater than the
Conversion Price (as defined in the Restated Certificate) (as adjusted) (the
"Series B Price") plus an additional number of shares as will enable Investor to
acquire 19.9% (or 20% if the Company no longer files a consolidated tax return
with Catalytica or if the Company upon its own initiative sells New Securities
and as a result of such sale or sales cannot file a consolidated tax return) of
the Company's total outstanding capital stock if Investor fully exercised its
rights under Section 11 of this Agreement or (ii) the amount of one-half (l/2)
of the New Securities being issued if the purchase price per share is less than
the Series B Price. A pro rata share, for purposes of this right of first
refusal, is the ratio that the sum of the number of shares of Common Stock then
held by Investor and the number of shares of Common Stock issuable upon
conversion of any other securities convertible into Common Stock then held by
Investor bears to the sum of the total number of shares of Common Stock then
outstanding and the number of shares of Common Stock issuable upon conversion of
any then outstanding other securities convertible into Common Stock (except for
Common Stock subject to rights issued under plans or grants of the type set
forth in Section 8(b)(ii)). In the event of an Initial Public Offering by the
Company, Investor shall be permitted to purchase at the public offering price
net the underwriting discount directly from the Company either in a separate
transaction or if permitted under

                                       24
<PAGE>

applicable securities laws as part of the registered offering such amount of
securities that would enable Investor to hold, in the aggregate, 20% of the
total outstanding capital stock of the Company assuming for purposes of this
Section 8 that Investor had fully exercised its option to purchase 535,715
shares of Series B Preferred as described in more detail in Section 11 of this
Agreement.

          (b) Except as set forth below, "New Securities" shall mean any shares
of capital stock of the Company, including Common Stock and Preferred Stock,
whether or not now authorized, and rights, options or warrants to purchase said
shares of Common Stock or Preferred Stock, and securities of any type whatsoever
that are, or may become, convertible into said shares of Common Stock or
Preferred Stock. Notwithstanding the foregoing, "New Securities" does not
include:

              (i)    the shares purchased under this Agreement or securities
issuable upon conversion of or with respect to the Series A or Series B
Preferred Stock or upon conversion of or with respect to any other Preferred
Stock subsequently issued;

              (ii)   capital stock issued or issuable to officers, directors or
employees of or consultants to the Company, primarily for the purpose of
soliciting or retaining their services to the Company, directly or pursuant to a
stock option plan, restricted stock purchase plan or other arrangement approved
by the Compensation Committee of the Board of Directors, in such amount as shall
be approved by such Compensation Committee, provided that a majority of the
members of which consist of individuals who are not officers of, or consultants
to the Company or any corporation controlling or controlled by the Company or
the Company's direct or indirect parent;

              (iii)  capital stock issued pursuant to any rights or agreements,
including without limitation convertible securities, options and warrants,
provided that the rights of first refusal established by this Section 8.1 apply
with respect to the initial sale or grant by the Company of such rights or
agreements;

              (iv)   securities issued pursuant to or in connection with any
corporate partnership, joint venture or licensing arrangement or in connection
with equipment lease financings or bank debt into which the Company may enter;

              (v)    capital stock issued in connection with any stock split,
stock dividend or recapitalization by the Company, and

              (vi)   securities issued pursuant to the acquisition of another
corporation by the Company by merger, purchase of substantially all of the
assets, or other reorganization whereby the Company owns not less than 50% of
the voting power of the surviving corporation.

                                       25
<PAGE>

   8.2    Notice and Closing.
          ------------------

          (a) In the event the Company proposes to undertake an issuance of New
Securities, it shall promptly give Investor written notice of its intention,
describing the type of New Securities, and the price and general terms upon
which the Company proposes to issue the same.  The Investor shall have ten (10)
business days from the date of receipt of any such notice to agree to purchase
up to its respective pro rata share of such New Securities for the price and
upon the terms specified in the notice by giving written notice to the Company
and stating therein the quantity of New Securities to be purchased.

          (b) Investor's notice to the Company of exercise of its rights under
this Section 8 shall constitute Investor's irrevocable acceptance of the
Company's offer, subject to customary closing conditions as set forth in the
terms to new investors.

          (c) The purchase and sale of any securities pursuant to any offer made
under this Section 8 that is accepted by the Investor shall take place at 7:00
a.m. on the date of the closing of the issuance of New Securities, or at such
other time and place as the Company and the Investor may mutually agree.  The
purchase price shall be payable in cash or in such other form as set forth in
the terms to the new investors at the discretion of the Investor.  The issuance
of such shares shall be conditioned upon compliance with applicable laws and
regulations and requirements of any applicable stock exchange and the absence of
any order in effect enjoining or restraining such exercise or issuance.

   8.3    Waiver.  In the event Investor fails to exercise the right of first
          ------
refusal within the period set forth in Section 8.2, the Company shall have
ninety (90) days thereafter to sell or enter into an agreement (pursuant to
which the sale of New Securities covered thereby shall be closed, if at all,
within sixty (60) days from the date of said agreement) to sell the New
Securities not elected to be purchased by Investor at the price and upon terms
no more favorable to the purchasers of such securities than specified in the
Company's notice.

                                   Section 9.
                   Board Representation and Voting Agreement
                   -----------------------------------------

   9.1    Board Representation Prior to Initial Public Offering. Prior to the
          -----------------------------------------------------
date of the Company's Initial Public Offering (as defined in Section 7.1) and
for so long as Investor shall hold fifty percent (50%) or more of the Series B
Preferred (or such securities issued upon the conversion thereof) outstanding on
the date of this Agreement, Investor shall have the right to designate a nominee
for election to the Company's Board of Directors and the Compensation Committee
of the Company's Board of Directors reasonably satisfactory to the Company.

                                       26
<PAGE>

   9.2    Board Representation After Initial Public Offering.  Subsequent to the
          --------------------------------------------------
Company's Initial Public Offering, so long as Investor shall beneficially own at
least five percent (5%) of the total outstanding Voting Stock of the Company (as
defined in Section 13), the Company shall include in its proxy statement, as a
"nominee" recommended by the Company's Board of Directors or management to
stockholders for election as a director at each annual meeting of stockholders
of the Company, commencing with the annual meeting of stockholders following the
Company's Initial Public Offering, one person designated by the Investor who is
reasonably satisfactory to the Company.

   9.3    Vacancy.  In the event that any designee nominated and elected as
          -------
provided in Section 9.1 or 9.2 shall cease to serve as a director for any reason
during the period that such Section is in effect, the vacancy resulting thereby
shall be filled by a designee of the Investor reasonably acceptable to the
Company.

   9.4    Voting Agreement. Catalytica agrees to vote any shares of Voting Stock
          ----------------
it owns in favor of any nominee of Investor selected under this Section 9 to
serve as a member of the Company's Board of Directors and as a member of the
Compensation Committee of the Company's Board of Directors.

                                  Section 10.
                       Certain Covenants of the Investor
                       ---------------------------------

     Until the termination of the particular covenant, as the case may be, the
Investor hereby agrees (on behalf of itself and any Affiliated Entity) as
follows:

   10.1   Limitation on Ownership of Voting Stock of the Company. Except as set
          ------------------------------------------------------
forth in this Agreement, neither the Investor nor any Affiliated Entity
collectively shall directly or indirectly acquire beneficial ownership of any
Voting Stock, any securities convertible into or exchangeable for Voting Stock
(as defined in Section 13), or any other right to acquire Voting Stock (except,
in any case, by way of stock dividends or other distributions or offerings made
available to holders of any Voting Stock generally) without the written consent
of the Company, if the effect of such acquisition would be to increase the
Voting Power of all Voting Stock then owned by the Investor and any Affiliated
Entity or which it has a right to acquire to an amount equal to 20% or more of
the Total Voting Power of the Company (as defined in Section 13) at such time,
provided that (a) the limitation of "20% or more" shall be changed to "25% or
more" upon either the Company's Initial Public Offering or after the Company has
a fiscal year with pre-tax income and (b) the limitation shall not apply to the
extent Investor is purchasing New Securities as permitted under Section 8 of
this Agreement.

   10.2   Limitations on Ownership of Voting Stock of Catalytica. Except as set
          ------------------------------------------------------
forth in this Agreement, neither the Investor nor any Affiliated Entity
collectively shall directly or indirectly acquire beneficial ownership of any
Voting Stock, any securities

                                       27
<PAGE>

convertible into or exchangeable for Voting Stock (as defined in Section 13), or
any other right to acquire Voting Stock (except, in any case, by way of stock
dividends or other distributions or offerings made available to holders of any
Voting Stock generally) without the written consent of the Catalytica, if the
effect of such acquisition would be to increase the Voting Power of all Voting
Stock then owned by the Investor and any Affiliated Entity or which it has a
right to acquire to an amount equal to 20% or more of the Total Voting Power of
the Catalytica (as defined in Section 13) at such time.

   10.3   Restrictions on Transfer of Voting Stock.
          ----------------------------------------

          (a) The Investor shall not, directly or indirectly, sell or transfer
any Voting Stock of the Company except (i) to the Company or any person or group
approved in writing by the Company; or (ii) to any Affiliated Transferee, so
long as such Affiliated Transferee agrees to hold such Voting Stock subject to
all the provisions of this Agreement, including this Section 10.3, and agrees to
transfer such Voting Stock to the Investor or another Affiliated Transferee of
the Investor if it ceases to be of the Investor; or (iii) pursuant to a bona
fide public offering registered under the Securities Act (which shall be
structured to distribute such shares or rights through an underwriter or
otherwise in such a manner as should not result in a sale or sales of beneficial
ownership of Voting Stock with aggregate voting power of 10% or more of the
Total Voting Power of the Company then in effect being transferred to a single
person or group); or (iv) into the public market pursuant to SEC Rule 144
(including Section (k) of SEC Rule 144 or a successor rule) under the Securities
Act (which shall be structured to distribute such shares or rights through an
underwriter or otherwise in such a manner as should not result in a sale or
sales of beneficial ownership of Voting Stock with aggregate voting power of 10%
or more of the Total Voting Power of the Company then in effect being
transferred to a single person or group); or (v) subject to the Company's right
of first refusal as set forth in Section 12.1 hereof, in transactions not
otherwise described herein so long as such transactions do not, directly or
indirectly, result, to the knowledge of Investor, in any single person or group
owning or having the right to acquire Voting Stock with aggregate voting power
of 10% or more of the Total Voting Power of the Company then in effect, and
provided Investor shall not sell Voting Stock to an entity which is an existing
customer (defined as an entity which has ordered a product from the Company), or
a prospective customer (defined as an entity with which the Company has had bona
fide discussions in the prior twelve (12) months regarding purchase of a product
from the Company), or a competitor of the Company without the written consent of
the Company; or (vi) pursuant to a bona fide pledge of such Voting Stock to an
institutional lender to secure a loan, guarantee or other financial support,
provided that such lender agrees to hold such Voting Stock subject to all
provisions of this Agreement and any sale or disposition by such lender of such
pledged Voting Stock shall be subject to the limitations of this Section 10.3;
or (vii) in the event of a merger or consolidation in which the holders of
Voting Stock of the Company prior to the merger or consolidation cease to

                                       28
<PAGE>

hold at least 51% of the Voting Stock of the surviving entity, or pursuant to a
plan of liquidation of the Company.

   10.4   No Sale or Transfer in First Year.  Notwithstanding the foregoing
          ---------------------------------
provisions Investor agrees not to sell or transfer directly or indirectly by
Voting Stock for one (1) year after the Closing Date except as provided in
Section 10.3(a) (ii), (iii), (iv), (vi) or (vii).

                                  Section 11.
                Investor's Option to Purchase Additional Shares
                -----------------------------------------------

   11.1   Option to Purchase. Investor may purchase after the Closing 535,715
          ------------------
shares of Series B Preferred (or Common Stock, if such Series B Preferred has
been otherwise automatically converted pursuant to the Restated Certificate)
provided such amount purchased would not increase its ownership of the Company,
as calculated on a fully diluted basis, to 19.9% (or to 20% if the Company no
longer files a consolidated tax return with Catalytica or if the Company upon
its own initiative sells New Securities and as a result of such sale or sales
cannot file a consolidated tax return) of the Company's total outstanding
capital stock on the date of the purchase at a price per share of $26.88 (as
adjusted on the same terms as the Conversion Price); provided however,
Investor's right to purchase such shares shall terminate at 5:00 p.m.,
California time on January 14, 2001. If prior to an Initial Public Offering the
Company issues shares of stock which become outstanding to employees, officers,
directors or consultants of the Company, then Investor may purchase additional
shares of stock to increase its ownership percentage to the foregoing
percentages upon the same terms as the option to purchase 535,715 shares of
Series B Preferred described in this Section 11. Any such purchase shall be
treated as a purchase for purposes of this Agreement, and the Series B Preferred
shares so acquired shall be purchased under an amendment to this Agreement
entered into between the Company and the Investor in which the representations
and warranties of the Company set forth in this Agreement and its Exhibits may
be revised to reflect any changes to the representations and warranties
occurring after the Closing.

                                  Section 12.
                         Company Right of First Refusal
                         ------------------------------

   12.1   Company Right of First Refusal. Prior to making any sale or transfer
          ------------------------------
of Voting Stock of the Company pursuant to Section 10.2(a)(v) hereof, the
Investor shall give the Company the opportunity to purchase such Voting Stock in
the following manner:

          (a) The Investor shall give notice (the "Transfer Notice") to the
Company in writing of such intention specifying the approximate number of the
proposed purchasers or transferees, the amount of Voting Stock proposed to be
sold or transferred,

                                       29
<PAGE>

the proposed price per share therefor (the "Transfer Price") and the other
material terms upon which such disposition is proposed to be made.

          (b) The Company shall have the right, exercisable by written notice
given by the Company to the Investor within sixty (60) days after receipt of
such Transfer Notice, to purchase all (and not less than all) of the Voting
Stock specified in such Transfer Notice for cash per share equal to the Transfer
Price.

          (c) If the Company exercises its right of first refusal hereunder, the
closing of the purchase of the Voting Stock with respect to which such right has
been exercised shall take place within thirty (30) days after the Company gives
written notice of such exercise, which period of time shall be extended in order
to comply with applicable securities laws and regulations.  Upon exercise of its
right of first refusal, the Company and the Investor shall be legally obligated
to consummate the purchase contemplated thereby and shall use commercially
reasonable efforts to secure any approvals required in connection therewith.

          (d) If the Company does not exercise its right of first refusal
hereunder within the time specified for such exercise, the Investor shall be
free, during the period of ninety (90) days following the expiration of such
time for exercise, to sell the Voting Stock specified in such Transfer Notice on
terms no less favorable to the Investor than the terms specified in such
Transfer Notice.

   12.2   Assignment of Rights.  In the event that the Company elects to
          --------------------
exercise a right of first refusal under this Section 12, the Company may specify
prior to closing such purchase another person as its designee to purchase the
Voting Stock to which such notice relates.  If the Company shall designate
another person as the purchaser pursuant to this Section 12, the giving of
notice of acceptance of the right of first refusal by the Company shall
constitute a legally binding obligation of the Company to complete such purchase
if such person shall fail to do so.

                                  Section 13.
                Certain Definitions and Termination of Covenants
                ------------------------------------------------

   13.1   Certain Definitions.  As used in this Agreement:
          -------------------

          (a) The term "Total Voting Power of the Company" means the total
number of votes which may be cast in the election of directors of the Company at
any meeting of stockholders of the Company if all securities entitled to vote in
the election of directors of the Company were present and voted at such meeting
(other than votes that may be cast only upon the happening of a contingency). In
the event that the Board of Directors is elected by class votes (rather than all
classes on an as-converted or a combined basis) then Total Voting Power shall be
determined in a manner that shall retain the ability of the Company to file a
consolidated tax return (to the extent

                                       30
<PAGE>

applicable) with Catalytica; provided that the foregoing shall not limit or
restrict any separate class or special voting rights held by Investor as to any
matters other than the election of directors.

          (b) The term "Total Voting Power of Catalytica" means the total number
of votes which may be cast in the election of directors of Catalytica at any
meeting of stockholders of Catalytica if all securities entitled to vote in the
election of directors of Catalytica were present and voted at such meeting
(other than votes that may be cast only upon the happening of a contingency). In
the event that the Board of Directors is elected by class votes (rather than all
classes on an as-converted or a combined basis) then Investor shall be entitled
to hold an identical percentage interest in each such distinct class of Voting
Stock.

          (c) The term "Voting Stock" means the Common Stock, Preferred Stock
and any other securities issued having the ordinary power to vote in the
election of directors (other than securities having such power only upon the
happening of a contingency).

          (d) The term "person" shall mean any person, individual, corporation,
partnership, trust or other nongovernmental entity or any governmental agency,
court, authority or other body (whether foreign, federal, state, local or
otherwise).

          (e) The term "PBGC" shall mean the Pension Benefit Guaranty
                        ----
Corporation established pursuant to Section 4002 of ERISA, or any successor
entity thereto.

          (f) The term "Affiliated Transferee" shall mean all those
                        ---------------------
corporations, associations or other business entities, including without
limitation Investor, of which Enron Corp., an Oregon corporation, owns or
controls either directly or indirectly more than 50% of the outstanding voting
or equity interests.

          (g) The term "Affiliated Entity" shall mean Enron Corp., an Oregon
corporation, and any person controlling, controlled by or under direct or
indirect common control with Enron Corp. or in which Enron Corp. holds more than
50% of the outstanding voting or equity interests.

   13.2   Termination of Covenants.  If not earlier terminated by the specific
          ------------------------
terms of such Sections, the provisions of Section 8 shall terminate on the
earlier of (i) the effective date of a Registration Statement filed with the
Securities and Exchange Commission pursuant to the Securities Act, covering
securities of the Company, (ii) seven (7) years after the Closing Date or (iii)
such time as Investor and any affiliate or subsidiary of Investor own in the
aggregate less than five percent (5%) of the then outstanding Voting Stock of
the Company and the provisions of Sections 10 and 12 shall terminate seven (7)
years after the Closing Date.

                                       31
<PAGE>

                                  Section 14.
                               Information Rights
                               ------------------

     The Company hereby covenants and agrees as follows:

   14.1   Annual and Quarterly Financial Information.  The Company will furnish
          ------------------------------------------
to the Investor:

          (a) As soon as practicable after the end of each fiscal year
commencing with fiscal year 1998, and in any event within 90 days thereafter, an
audited, consolidated balance sheet of the Company and its subsidiaries, if any,
as of the end of such fiscal year, and audited, consolidated statements of
operations and statements of cash flow of the Company and its subsidiaries, if
any, for such year, each of which shall be reviewed by an accounting firm of
national reputation in connection with the annual audit of Catalytica, and all
of which shall be prepared in accordance with generally accepted accounting
principles applied on a consistent basis.

          (b) As soon as practicable after the end of the first, second and
third quarterly accounting periods in each fiscal year of the Company and in any
event within 45 days thereafter, a consolidated balance sheet of the Company and
its subsidiaries, if any, as of the end of each such quarterly period, and
consolidated statements of operations and statements of cash flow of the Company
and its subsidiaries for such period and for the current fiscal year to date,
prepared in accordance with generally accepted accounting principles applied on
a consistent basis, except for the absence of normal audit adjustments and the
absence of other supporting statements, schedules and footnotes.

   14.2   Confidentiality of Information.  The Investor agrees that any
          ------------------------------
information obtained pursuant to this Section 14 which is, or would reasonably
be perceived to be, proprietary to the Company or otherwise confidential will
not be disclosed without the prior written consent of the Company.

   14.3   Assignment of Information Rights. The rights granted pursuant to this
          --------------------------------
Section 14 may not be assigned without the Company's consent except to an
Affiliated Transferee.

   14.4   Termination. The rights set forth in this Section 14 shall terminate
          -----------
upon the effective date of a Registration Statement covering the Company's
securities filed with the Securities and Exchange Commission.

                                       32
<PAGE>

                                  Section 15.
               Additional Covenants of Catalytica and the Company
               --------------------------------------------------

   15.1   Stock to be Reserved. Each of Catalytica and the Company covenant that
          --------------------
all shares that may be issued upon the conversion of the Series B Preferred
Stock will, upon issuance, be validly issued, fully paid and nonassessable and
free from all taxes, liens and charges with respect to the issuance thereof. The
Company further covenants that during the period within which the Series B
Preferred Stock may be converted, Catalytica and the Company will at all times
have authorized and reserved a sufficient number of shares of Common Stock to
permit the conversion of the Series B Preferred Stock.

   15.2   Use of Proceeds. The proceeds of the sale of the Series B Preferred
          ---------------
Stock shall be used for the purpose of working capital and capital expenditures
consistent with the annual operating plan approved by the Board of Directors of
the Company and may not be used for the payment of any dividend or repurchase of
stock.

   15.3   Intercompany Obligations. Each of Catalytica and the Company covenant
          ------------------------
that all payables, indebtedness and other monetary obligations of the Company
and its subsidiaries to Catalytica incurred prior to the Closing which have not
been retired, repaid or otherwise modified as a contribution of capital to the
Company prior to the Closing shall be contributed as capital to the Company as
soon as practicable from and after the Closing. Investor acknowledges that the
Company will provide in its Amended and Restated Certificate of Incorporation,
attached hereto as Exhibit A, an increase in the liquidation preference of the
Series A Preferred Stock on a per share basis, which shall be determined by
aggregating the entire amount of payables, indebtedness and other monetary
obligations contributed to the capital of the Company by Catalytica and dividing
such aggregate amount by 7,000,000.

                                  Section 16.
                                 Miscellaneous
                                 -------------

   16.1   Survival of Warranties. The warranties, representations and covenants
          ----------------------
of the Company and the Investor contained in or made pursuant to this Agreement
shall survive the execution and delivery of this Agreement and the Closing,
regardless of any investigation made by the Investors or on their behalf.

   16.2   Successors and Assigns. The terms and conditions of this Agreement
          ----------------------
shall inure to the benefit of and be binding upon the respective permitted
successors and assigns of the parties. Nothing in this Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

                                       33
<PAGE>

   16.3   Governing Law. This Agreement shall be governed by and construed under
          -------------
the laws of the State of Delaware (irrespective of its choice of law
principles).

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

   16.5   Titles and Subtitles. The titles and subtitles used in this Agreement
          --------------------
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

   16.6   Notices. Unless otherwise provided, any notice required or shall be
          -------
given in writing and shall be deemed effectively given upon personal delivery to
the party to be notified, or if sent by telex, facsimile or telecopier, upon
receipt of the correct answer back, or upon deposit with the United States Post
Office, by registered or certified mail, or upon deposit with an overnight
courier, in each case postage prepaid and addressed to the party to be notified
at the address indicated for such party on the signature page hereof, or at such
other address as such party may designate by advance written notice to the other
parties.

   16.7   Finder's Fee. Each party represents that it neither is nor will be
          ------------
obligated for any finder's fee or commission in connection with this
transaction. Investor agrees to indemnify and hold harmless the Company from any
liability for any commission or compensation in the nature of a finder's fee
(and the costs and expenses of defending against such liability or asserted
liability) for which the Investor or any of its officers, employees or
representatives is responsible.

          The Company agrees to indemnify and hold harmless Investor from any
liability for any commission or compensation in the nature of a finder's fee
(and the costs and expense of defending against such liability or asserted
liability) for which the Company or any of its officers, employees or
representatives is responsible.

   16.8   Expenses.  Irrespective of whether thc Closing is effected, the
          --------
Company and Investor shall pay their respective costs and expenses incurred with
respect to the negotiation, execution, delivery and performance of this
Agreement.

   16.9   Amendment and Waivers. Any term of this Agreement may be amended and
          ---------------------
the observance of any term of this Agreement may be waived (either generally or
in a particular instance and either retroactively or prospectively), only with
the written consent of the Company and the Investor.

   16.10  Severability. If one or more provisions of this Agreement is held to
          ------------
be unenforceable under applicable law, such provision shall be excluded from
this

                                       34
<PAGE>

Agreement and the balance of this Agreement shall be interpreted as if such
provision were so excluded and otherwise shall be enforceable in accordance with
its terms.

   16.11  Aggregation of Stock. All shares of Common Stock or securities
          --------------------
convertible into Common Stock held or acquired by affiliated entities or persons
shall be aggregated together for the purpose of determining the availability of
any rights under this Agreement.

   16.12  Affiliates and Subsidiaries. The terms and conditions of this
          ---------------------------
Agreement shall be binding upon Investor and any Affiliated Transferee.

   16.13  Saturday, Sundays, Holidays, etc. If the last or appointed day for the
          --------------------------------
taking of any action or the expiration of any right required to granted herein
shall be a Saturday or a Sunday or shall be legal holiday, then such action may
be taken or such right may be exercised on the next succeeding day not a legal
holiday.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

                              CATALYTICA, INC.

                              By: /s/ Lawrence W. Briscoe
                                 ----------------------------------

                              Title: Chief Financial Officer
                                    -------------------------------

                    Address:  430 Ferguson Drive
                              Mountain View, California 94043
                              Attn:  Lawrence Briscoe

                              CATALYTICA COMBUSTION SYSTEMS, INC.

                              By: /s/ Dennis A. Orwig
                                 ----------------------------------

                              Title: President & CEO
                                    -------------------------------

                    Address:  430 Ferguson Drive
                              Mountain View, California 94043
                              Attn:  Lawrence Briscoe

                                       35
<PAGE>

                              ENRON VENTURES CORP.

                              By: /s/ Thomas E. White
                                 ----------------------------------

                              Title: Chairman & CEO
                                    -------------------------------

                    Address:  1400 Smith Street
                              Houston, Texas  77002
                              Attn:  Vice President and Secretary

                                       36<PAGE>

                                                                   EXHIBIT 10.11

                               Omnibus Agreement

     This Omnibus Agreement ("Agreement") is made and entered into as of this
29th day of August, 2000, by and among Catalytica, Inc. ("Catalytica"),
Catalytica Combustion Systems, Inc. ("CCSI"), Sundance Assets, L.P. ("Sundance")
and Enron North America Corp. ("ENA").

                                   Recitals

     A.   Catalytica, CCSI and Sundance (successor to Enron Ventures Corp.) are
parties to a Series B Stock Purchase Agreement dated as of December 9, 1997 (the
"Stock Purchase Agreement") pursuant to which Enron Ventures Corp. purchased
shares of Series B Preferred Stock of CCSI, which shares were transferred to
Sundance.  Sundance has certain rights to purchase additional shares of capital
stock of CCSI in the future.

     B.   In connection with Catalytica's merger agreement with DSM, N.V., and
Synotex Company, Inc. (the "Catalytica/DSM Merger Agreement"), CCSI is
contemplating a transaction pursuant to which Catalytica would contribute not
less than $30 million cash to CCSI and receive additional shares of CCSI Common
Stock and immediately thereafter distribute to the Stockholders of Catalytica
all of the outstanding shares of Common Stock of CCSI held by Catalytica (such
contribution and distribution being together herein referred to as the "Spin-
Off").

     C.   ENA and CCSI have executed an Option Repurchase Agreement dated as of
December 15, 1999 (the "Option Repurchase Agreement") and ENA  has repurchased
the Option (as defined in the Option Repurchase Agreement) from CCSI pursuant to
a letter agreement dated May 7, 2000.

     D.   Subject to the terms and conditions of this Agreement, Catalytica,
CCSI, Sundance and ENA have entered into this Agreement to, among other things,
make certain modifications to the Stock Purchase Agreement, enter into certain
agreements with respect to the Option Repurchase Agreement, obtain Sundance's
consent to Catalytica's transfer of the CCSI stock in the Spin-Off as required
by Section 2.2 of the Stockholder's Agreement dated as of January 14, 1988, by
and among Catalytica, CCSI and Enron Ventures Corp. (the predecessor of
Sundance), and obtain CCSI's consent to the Amendment No. 1 to Xonon Technology
Implementation Agreement attached hereto as Exhibit B (which Agreement as so
amended is referred to herein as the "XTIA") between ENA, General Electric Corp.
("GE") and Westdeutsche Landesbank Girozentrale, New York Branch.

     The Parties Agree As Follows:

1.   Recapitalization.

     Catalytica and CCSI will take all action necessary to approve, adopt and
     file with the Secretary of State of the State of Delaware the Amended and
     Restated Certificate of Incorporation substantially in the form attached as
     an exhibit to the registration statement
<PAGE>

     filed in connection with the Spin-Off and hereto as Exhibit A (the
     "Restated Certificate") in order to in each case effective concurrently
     with the Spin-Off (i) effect a "two-for-one" split in the Company's Common
     Stock, (ii) increase the authorized shares of capital stock, and (iii)
     remove the rights, preferences and privileges of the Company's preferred
     stock. . Catalytica and CCSI will, to the extent contemplated by the
     Catalytica/DSM Merger Agreement, continue to pursue the Spin-Off, file the
     related registration statement(s) with the SEC and, subject to the
     conditions precedent set forth in the Catalytica/DSM Merger Agreement in
     effect as of the date hereof, complete the Spin-Off. Sundance agrees to the
     recapitalization to be reflected in the Restated Certificate and agrees to
     take, and to cause any of its affiliates to whom its CCSI Preferred Stock
     (or CCSI Common Stock acquired on the conversion thereof) has been
     transferred prior to the Spin-Off to take, any and all actions reasonably
     necessary or appropriate to carry out the intent of this section, including
     the execution and delivery of any and all stockholder resolutions necessary
     to approve and adopt the Restated Certificate effective concurrently with
     the Spin-Off. Sundance and ENA also hereby consent to the merger between,
     or other combination of, CCSI and Catalytica Advanced Technologies, Inc. as
     contemplated by the Catalytica/DSM Merger Agreement, effective concurrently
     with the Spin-Off.

2.   Conversion of Preferred Stock.

     Sundance agrees to convert, and to cause any of its affiliates to whom its
     CCSI Preferred Stock (or CCSI Common Stock acquired on the conversion
     thereof) has been transferred prior to the Spin-Off to convert, all the
     shares of CCSI Class B Preferred Stock held by Sundance as of the date of
     this Agreement and acquired thereafter to CCSI Common Stock effective
     concurrently with the Spin-Off as permitted by Article IV, 5(a) of CCSI's
     Amended and Restated Certificate of Incorporation in effect as of the
     execution date of this Agreement (the "Existing Charter").  Catalytica
     agrees to convert all the shares of CCSI Class A Preferred Stock held by
     Catalytica on or acquired by it after the execution date of this Agreement
     to CCSI Common Stock immediately prior to the Spin-Off as permitted by
     Article IV, 5(a) of the Existing Charter.

3.   Consent to Transfer.

     Sundance hereby consents to the transfer of shares of Common Stock of CCSI
     pursuant to the Spin-Off.

4.   Amendment of Option.

     Subject to the terms and conditions of this Agreement, as an alternative to
     exercising the option set forth at Section 11 of the Stock Purchase
     Agreement by means of a cash payment, the parties hereto agree that the
     option also may be exercised in whole at any time on or after the 10th
     trading day for CCSI Common Stock subsequent to the completion of the Spin-
     Off by giving written notice to CCSI of Sundance's election to make a
     "cashless" exercise.  Upon receipt of such notice, CCSI shall issue to
     Sundance a number of shares of CCSI Common Stock computed using the
     following formula:

                                       2
<PAGE>

                                  X = Y(A-B)
                                      ------
                                          A

     Where   X =  the number of shares of CCSI Common Stock to be issued to
                  Sundance;

             Y =  535,715, as adjusted pursuant to the Stock Purchase Agreement;

             A =  the average of the closing sales prices for the CCSI Common
                  Stock on the Nasdaq Market, or if the Common Stock is not then
                  traded on the Nasdaq Market, on such other national securities
                  exchange on which the CCSI Common Stock is then traded, for
                  the ten (10) consecutive trading days immediately prior to the
                  date such notice of exercise is given by Sundance; and

             B =  the exercise price of the option specified in Section 11 of
                  the Stock Purchase Agreement (as adjusted to the date of
                  exercise pursuant to the provisions of such Section 11).

5.   Price of New Securities, Right of First Refusal.  The sale of New
     Securities (as defined in the Stock Purchase Agreement) by CCSI to
     Catalytica in connection with its proposed cash contribution to CCSI in the
     Spin-Off shall be subject to Section 8 of the Stock Purchase Agreement, and
     Catalytica shall comply with all of its obligations under Section 8 in
     connection therewith, including the giving of the notice required by
     Section 8.2, provided that, in the event a "when-issued" trading market for
     the CCSI Common Stock develops prior to the Spin-Off, the price at which
     the CCSI Common Stock shall be sold to Catalytica shall be equal to the
     average closing "when-issued" trading price for CCSI Common Stock for the
     10 or fewer "when-issued" trading days preceding the sale of such New
     Securities to Catalytica and in the event such price can be determined by
     such "when-issued" trading price, Sundance hereby waives and terminates its
     right of first refusal set forth at Section 8 of the Stock Purchase
     Agreement with respect to the sale of CCSI Common Stock to Catalytica in
     conection with the Spin-Off.

6.   Modification of Registration Rights.

     6.1  The provisions of Section 7 of the Stock Purchase Agreement are
     amended as provided below:

     (A)  Section 7.2(c) shall be amended and restated in its entirety to
     provide as follows:

          (c)  Notwithstanding the foregoing, (i) the Company shall not be
     obligated to file a registration statement relating to a Demand
     Registration under this Section 7.2 if counsel to the Company renders an
     opinion to the effect that registration under the Securities Act is not
     required for the proposed transfer of Registrable Securities, (ii) the
     Company shall not be required to effect more than two registrations
     pursuant to this Section 7.2, (iii) Investor shall not request, and the
     Company shall not be required to file any registration statement pursuant
     to this Section 7.2 prior to the completion of the Spin-Off (as that term
     is defined in that certain Omnibus Agreement among the Company,

                                       3
<PAGE>

     Catalytica, Sundance Assets, L.P. and Enron North America Corp. dated as of
     August 29, 2000 (the "Omnibus Agreement")) and (iv) the Company shall not
     be required to file a registration statement relating to a Demand
     Registration under this Section 7.2 if the amount of Registrable Securities
     to be sold pursuant to such registration is less than $7,500,000 in market
     value at the time the request for such registration is made to the Company.
     In addition, the Company may defer the filing of a registration statement
     relating to a Demand Registration if (1) the Company has filed, or is about
     to file, a registration statement relating to the offering of or (2) has
     undertaken or is about to undertake without a registration statement the
     offering of (including, without limitation, a so-called private investment
     in public equity securities or "PIPES" offering and an offering pursuant to
     Rule 144A under the Securities Act ("Rule 144")) any of the Company's
     securities (a "Company Offering"), and the managing underwriter (or
     placement agent, initial purchaser or other entity serving in a similar
     capacity) of the Company Offering in its sole discretion is of the opinion
     that the filing of a registration statement with respect to such Demand
     Registration could be expected to adversely affect the Company Offering,
     including, without limitation, the price at which the securities to be
     offered in the Company Offering may be sold; provided, that the Company
                                                  --------
     shall use reasonable efforts to file its proposed registration statement,
     if applicable, and to commence and complete the Company Offering in a
     diligent manner and, in any event, the Company shall not defer the filing
     of a registration statement relating to the Demand Registration for more
     than 120 days from the completion of the Company Offering.  Furthermore,
     the Company may defer the filing of a registration statement relating to a
     Demand Registration for up to 120 days after the request for registration
     is made if the Board determines in good faith that such registration would
     adversely affect or otherwise interfere with a proposed or pending
     transaction by the Company, including, without limitation, a material
     financing or a corporate reorganization, or during any period of time in
     which the Company is in possession of material inside information
     concerning the Company or its securities, which information the Company
     determines in good faith is not ripe for disclosure.  The Company shall not
     be required to undergo or pay for any special audit to effect any
     registration statement under this Section 7.2, and if such a special audit
     would be required in order to file or effect a registration statement
     hereunder, the Company shall be entitled to delay the filing or
     effectiveness of such registration statement until a reasonable period of
     time following the completion of the next audit scheduled in the ordinary
     course of the Company's activities; provided, that the Company shall not be
                                         --------
     entitled to further defer the filing or effectiveness of such registration
     statement if the Investor agrees in writing to pay for the cost of any such
     special audit.

     (B)  Section 7.2 shall be amended by adding the following as paragraph (g):

          (g)  If a Demand Registration is in the form of an underwritten
     offering, the Company shall (i) enter into an underwriting agreement in
     form and substance customary for an underwritten offering of this type,
     (ii) use its reasonable best efforts to cause one or more accounting firms
     to provide to the underwriters one or more "comfort letters" customary for
     an underwritten offering of this type, (iii) use its reasonable best
     efforts to cause one or more legal counsel to provide the underwriters one
     or more legal opinions customary for an underwritten offering of this type,
     (vi) use its reasonable best efforts to

                                       4
<PAGE>

     cause its officers to sign and deliver to the underwriters one or more
     officers' or secretary's certificates customary for an underwritten
     offering of this type and (v) cause its executive officers to participate
     in "road show" presentations customary for an underwritten offering of this
     type.

     (C)  Section 7.3(b) is hereby amended by and restated in its entirety to
     provide as follows:

          (b)  Underwriting.  If the registration of which the Company gives
               ------------
     notice is for a registered public offering involving an underwriting, the
     Company shall so advise the Investor as a part of the written notice given
     pursuant to this Section 7.3.  In such event the right of the Investor to
     registration pursuant to this Section 7.3 shall be conditioned upon the
     Investor's participation in such underwriting and the inclusion of the
     Investor's Registrable Securities in the underwriting to the extent
     provided herein.  The Investor shall (together with the Company and the
     other holders distributing their securities through such underwriting)
     enter into an underwriting agreement in customary form with the managing
     underwriter selected for such underwriting by the Company.  Notwithstanding
     any other provision of this Section 7.3, if the managing underwriter
     determines that marketing factors require a limitation of the number of
     shares to be underwritten, the underwriter may limit the number of the
     Registrable Securities to be included in such registration and
     underwriting.  In the event of such a limitation by the managing
     underwriter, the Company shall so advise all holders distributing their
     securities through such underwriting, and the number of shares of
     Registrable Securities that may be included in the registration and
     underwriting shall be allocated among all holders thereof, including the
     Investor, in proportion, as nearly as practicable, to the respective
     amounts of Registrable Securities held by all such holders at the time of
     filing the registration statement.  If the Investor disapproves of the
     terms of any such underwriting, the Investor may elect to withdraw
     therefrom by written notice to the Company and the managing underwriter.
     Any securities excluded or withdrawn from such underwriting shall be
     withdrawn from such registration, but (subject to Section 7.6 hereof) shall
     not be transferred in a public distribution prior to ninety (90) days after
     the effective date of the registration statement relating thereto.

     (D)  Section 7.6 shall be amended to and restated in its entirety to read
     as follows:

     7.6  "Market Stand-Off" Agreement.  For so long as the Investor holds
           ---------------------------
     Registrable Securities equal to or greater than five percent (5%) of the
     Total Voting Power of the Company (as defined in Section 11), the Investor
     hereby agrees that it shall not, to the extent requested by the Company and
     an underwriter of Common Stock (or other securities) of the Company, sell
     or otherwise transfer or dispose of any Registrable Securities during the
     90-day period following the effective date of any registration statement
     filed on behalf of the Company with the Securities and Exchange Commission;
     provided, however, that the foregoing provision shall not prohibit the
     sale, transfer or other disposition of Registrable Securities or other
     securities of the Company (i) from the Investor to an Affiliated Entity, or
     from an Affiliated Entity to another Affiliated Entity, if the transferee
     thereof agrees in writing with the Company's underwriter representative to
     be subject to the provisions of this Section 7.6; or (ii) from the Investor
     or from an

                                       5
<PAGE>

     Affiliated Transferee to whom Registrable Securities have been transferred
     in accordance with this Section 7.6, to an entity in which the Investor or
     an Affiliated Entity has an equity interest in one or more cash-settled
     hedging or other risk management transactions (a "Permitted Hedge
     Transaction"), provided that, with respect to this clause (ii), Investor or
     Affiliated Transferee, as the case may be ("Transaction Party"), represents
     to the Company's underwriter representative in an agreement that (a) the
     Transaction Party shall not enter into a Permitted Hedge Transaction unless
     such entity ("Transaction Counterparty") and its members have first
     undertaken in writing to the Transaction Party not to effect any other
     transactions in shares of Common Stock of the Company, or options or
     warrants to purchase shares of Common Stock of the Company, or securities
     convertible into, exchangeable for or that represent the right to receive
     shares of Common Stock of the Company, prior to the expiration of the
     lockup period then applicable to Transaction Party under such agreement,
     (b) the Transaction Counterparty shall not waive, amend, modify or
     terminate the undertaking referred to in (a) above by the Transaction
     Counterparty without the Company's underwriter representative's prior
     written consent, (c) the Transaction Party will not make any public filing
     or other public disclosure as a result of or in respect of any Permitted
     Hedge Transaction, except that the Transaction Party or any Affiliated
     Entity may make such public filings as may be required pursuant to law,
     regulation or judicial or administrative order, including the requirements
     of the Securities Exchange Act of 1934, as amended, and rules and
     regulations of the Securities and Exchange Commission adopted thereunder,
     which filings shall include a footnote describing the Permitted Hedge
     Transaction as a cash settled risk management transaction.

     6.2  Catalytica and CCSI hereby agree that the limitations upon Sundance's
     right to dispose of its CCSI Common Stock imposed by Section 7.6 of the
     Stock Purchase Agreement (as amended hereby) shall not apply by virtue of
     the filing or effectiveness of any registration statement filed with the
     Securities and Exchange Commission on behalf of CCSI in connection with the
     Spin-Off.

7.   Board Representation and Voting Agreement.

     The provisions of Section 9 of the Stock Purchase Agreement are amended and
     restated in their entirety as follows:

     9.1  Board Representation Prior to Spin-Off.  Prior to the date of the
          --------------------------------------
     Spin-Off and for so long as Investor shall hold fifty percent (50%) or more
     of the Series B Preferred (or such securities issued upon the conversion
     thereof) outstanding on the date of this Agreement, Investor shall have the
     right to designate a nominee for election to the Company's Board of
     Directors and the Compensation Committee of the Company's Board of
     Directors reasonably satisfactory to the Company.

     9.2  Board Representation After Spin-Off.  Subsequent to the Spin-Off, so
          -----------------------------------
     long as Investor shall beneficially own at least five percent (5%) of the
     total outstanding Voting Stock of the Company (as defined in Section 13),
     the Company shall include in its proxy statement, as a "nominee"
     recommended by the Company's Board of Directors or management to
     stockholders for election as a director at each annual meeting of

                                       6
<PAGE>

     stockholders of the Company, commencing with the annual meeting of
     stockholders following the Spin-Off, one person designated by the Investor
     who is reasonably satisfactory to the Company.

     9.3  Vacancy.  In the event that any designee nominated and elected as
          -------
     provided in Section 9.1 or 9.2 shall cease to serve as a director for any
     reason during the period that either such Section is in effect, the vacancy
     resulting thereby shall be filled by a designee of the Investor reasonably
     acceptable to the Company.

8.   Investor's Option to Purchase Additional Shares.

     Without limiting Section 2 of this Agreement, the provisions of Section 11
     of the Preferred Stock Purchase Agreement are amended and restated in their
     entirety as follows:

     Option to Purchase.  Investor may purchase after the Closing 535,715 shares
     ------------------
     of Series B Preferred (or Common Stock, if such Series B Preferred has been
     otherwise automatically converted pursuant to the Restated Certificate)
     provided such amount purchased would not increase its ownership of the
     Company, as calculated on a fully diluted basis, to 19.9% (or to 20% if the
     Company no longer files a consolidated tax return with Catalytica or if the
     Company upon its own initiative sells New Securities and as a result of
     such sale or sales cannot file a consolidated tax return) of the Company's
     total outstanding capital stock on the date of the purchase at a price per
     share of $26.88 (as adjusted on the same terms as the Conversion Price);
     provided however, Investor's right to purchase such shares shall terminate
     at 5:00 p.m., California time on January 14, 2001.  If prior to the Spin-
     Off, the Company issues shares of stock (except pursuant to exercise of
     options granted under CCSI's employee stock option plans) which become
     outstanding to employees, officers, directors or consultants of the
     Company, then Investor may purchase additional shares of stock to increase
     its ownership percentage to the foregoing percentages upon the same terms
     as the option to purchase 535,715 shares of Series B Preferred described in
     this Section 11.  Any such purchase shall be treated as a purchase for
     purposes of this Agreement, and the Series B Preferred shares so acquired
     shall be purchased under an amendment to this Agreement entered into
     between the Company and the Investor in which the representations and
     warranties of the Company set forth in this Agreement and its Exhibits may
     be revised to reflect any changes to the representations and warranties
     occurring after the Closing.

9.   SEC Compliance; Approval Right Regarding Description of Enron
Relationships. Prior to the Spin-Off, Catalytica will cause CCSI to, and after
the Spin-Off CCSI will, comply with the Securities Act of 1933, as amended (the
"1933 Act") and the rules and regulations of the SEC adopted thereunder (the
"1933 Act Regulations") in connection with the Spin-Off. Catalytica will cause
CCSI to, and CCSI will, (i) deliver to Sundance and ENA drafts of the SEC
registration and information statement(s) relating to the Spin-Off
(collectively, the "Information Statement") and each amendment or supplement
thereto at least 24 hours prior to the filing there with the SEC, (ii) not file
with the SEC or distribute to any potential distributee of shares of Common
Stock any Information Statement, any other report, document, registration
statement or prospectus to be filed

                                       7
<PAGE>

     with the SEC under the 1933 Act, the 1933 Act Regulation, the Securities
     Exchange Act of 1934 (the "1934 Act") or the rules and regulations of the
     SEC adopted under the 1934 Act (the "1934 Regulations"), or any amendment
     or supplement to any of the foregoing, which contains a description of any
     relationship, contract arrangement, understanding or intention involving
     Sundance, ENA or any affiliate of Sundance or ENA to which Sundance or ENA
     reasonably object on the basis that such description is not an accurate
     description of any relationship, contract, arrangement, understanding, or
     intention involving any of such entities or that such description would
     result in the Information Statement or other report, document, registration
     statement or prospectus, as amended or supplemented, containing an untrue
     statement of a material fact or omitting to state a material fact necessary
     in order to make the statements therein not misleading and (iii) not file
     as an exhibit to the Information Statement or other report, document,
     registration statement or prospectus any agreement as to which either
     Sundance or ENA or any of their affiliates is a party and as to which
     either Sundance or ENA reasonably objects to the filing thereof on the
     basis that the filing of such exhibit is not required pursuant to the 1933
     Act, the 1933 Act Regulations, the 1934 Act or the 1934 Act Regulations;
     provided, however, that if either Sundance or ENA reasonably objects to the
     filing of an agreement pursuant to clause (iii) above to which CCSI is a
     party, then CCSI shall be permitted to file the agreement as an exhibit to
     the Information Statement or other report, document, registration statement
     or prospectus if CCSI provides to Sundance or ENA a copy of correspondence
     of counsel from a nationally recognized law firm setting forth advice that
     the filing of such agreement as an exhibit to the Registration Statement is
     required by the 1933 Act, the 1933 Act Regulations, the 1934 Act or the
     1934 Act Regulations.

10.  Amendment of Definition of Affiliated Entity. The definition of Affiliated
     Entity in Section 13.1(g) of the Stock Purchase Agreement is hereby amended
     to add the words "directly or indirectly" prior to the word "holds" where
     it currently appears.

11.  Assignability of Rights of Sundance. Notwithstanding any provision to the
     contrary in the Stock Purchase Agreement, the rights of Sundance pursuant
     to the Stock Purchase Agreement and the rights of Sundance and ENA pursuant
     to this Agreement may be assigned in whole, but not in part, to an
     Affiliated Entity (as defined in the Stock Purchase Agreement after giving
     effect to Section 10 above), or to a purchaser of Shares pursuant to a
     sale, transfer or other disposition of Shares to an unaffiliated third
     party, and upon any such assignment (i) by Sundance, the assignee of such
     rights shall be provided the full benefit of such rights as if it was the
     "Investor" under the Stock Purchase Agreement or as if it was Sundance
     pursuant to this Agreement or (ii) by ENA, the assignee of such rights
     shall be provided the full benefit of such rights as if it was "ENA" under
     this Agreement, provided that in no event shall the number of Demand
     Registrations afforded Investor (as those terms are defined in the Stock
     Purchase Agreement) by Section 7 of the Stock Purchase Agreement exceed two
     or shall the number of nominees of Investor to be designated pursuant to
     Section 9 of the Stock Purchase Agreement be greater than one.

12.  Termination of CCSI Right of First Refusal. The provisions of Section 12 of
     the Stock Purchase Agreement shall be terminated effective as of the
     execution date of this Agreement.

                                       8
<PAGE>

13.  Transfer Restrictions. No other provision of the Stock Purchase Agreement
     shall be construed to prohibit the sale, transfer or other disposition of
     CCSI Securities permitted by Section 4.6(a) and (b) of the Stock Purchase
     Agreement. The requirement of Section 4.6(b) relating to notification of
     the Company of the proposed disposition and the furnishing of a detailed
     statement of the circumstances surrounding the proposed disposition shall
     not apply to transactions made pursuant to Rule 144. In addition, nothing
     in the Stock Purchase Agreement shall be construed to prohibit the sale,
     transfer or other disposition of CCSI Securities or the risk management
     transactions referred to in the proviso to Section 7.6 of the Stock
     Purchase Agreement added by Section 6.1(D) of this Agreement (whether or
     not occurring in connection with a registered offering), or the assignments
     permitted by Section 11 of this Agreement.

     In addition, and without limiting the generality of the foregoing, Section
     10.3 of the Stock Purchase Agreement is hereby amended and restated in its
     entirety to provide as follows:

     10.3  Restrictions on Transfer of Voting Stock
           ----------------------------------------

     (a) The Investor (or any Affiliated Entity or Affiliated Transferee or
     other person to whom the Voting Stock of the Company has been sold or
     transferred as permitted by this Section) shall not, directly or
     indirectly, sell or transfer any Voting Stock of the Company except (i) to
     the Company or any person or group approved in writing by the Company; or
     (ii) to any Affiliated Transferee, so long as such Affiliated Transferee
     agrees to hold such Voting Stock subject to all the provisions of this
     Agreement, including this Section 10.3; or (iii) pursuant to a bona fide
     public offering registered under the Securities Act (which shall be
     structured to distribute such shares or rights through an underwriter or
     otherwise in such a manner as should not result in a sale or sales of
     beneficial ownership of Voting Stock with aggregate voting power of 10% or
     more of the Total Voting Power of the Company then in effect being
     transferred to a single person or group), or (iv) into the public market
     pursuant to SEC Rule 144 (including Section (k) of SEC Rule 144 or a
     successor rule) under the Securities Act (which shall be structured to
     distribute such shares or rights through an underwriter or otherwise in
     such a manner as should not result in a sale or sales of beneficial
     ownership of Voting Stock with aggregate voting power of 10% or more of the
     Total Voting Power of the Company then in effect being transferred to a
     single person or group); or (v) in transactions not otherwise described
     herein so long as such transactions do not, directly or indirectly, result,
     to the knowledge of Investor, in any single person or group owning or
     having the right to acquire Voting Stock with aggregate voting power of 10%
     or more of the Total Voting Power of the Company then in effect, and
     provided Investor shall not sell Voting Stock to any entity which is an
     existing customer (defined as an entity which has ordered a product from
     the Company), or a prospective customer (defined as an entity with which
     the Company has had bona fide discussions in the prior twelve (12) months
     regarding purchase of a product from the Company), or a competitor of the
     Company without the written consent of the Company; or (vi) pursuant to a
     bona fide pledge of such Voting Stock to an institutional lender to secure
     a loan, guarantee or other financial support, provided that such lender
     agrees to

                                       9
<PAGE>

     hold such Voting Stock subject to all provisions of this Agreement and any
     sale or disposition by such lender of such pledged Voting Stock shall be
     subject to the limitations of this Section 10.3; or (vii) in the event of a
     merger or consolidation in which the holders of Voting Stock of the Company
     prior to the merger or consolidation cease to hold at least 51% of the
     Voting Stock of the surviving entity, or pursuant to a plan of liquidation
     of the Company; or (viii) to an Affiliated Entity, or from an Affiliated
     Entity to another Affiliated Entity; or (ix) subject to Section 7.6(ii) in
     the case of a sale, transfer or disposition in the 90 days following the
     effective date of any registration statement filed on behalf of the Company
     with the Securities and Exchange Commission, to an entity in which the
     Investor or an Affiliated Transferee or Affiliated Entity has an equity
     interest in one or more cash-settled hedging or other risk management
     transactions.

14.  Amendment of Section 10.1 of Stock Purchase Agreement. Section 10.1 of the
     Stock Purchase Agreement is hereby amended and restated in its entirety to
     provide as follows:

     10.1  Limitation on Ownership of Voting Stock of the Company.  Except as
           ------------------------------------------------------
     set forth in this Agreement, neither the Investor nor any Affiliated Entity
     collectively shall directly or indirectly acquire beneficial ownership of
     any Voting Stock, any securities convertible into or exchangeable for
     Voting Stock (as defined in Section 13), or any other right to acquire
     Voting Stock (except, in any case, by way of stock dividends or other
     distributions or offerings made available to holders of any Voting Stock
     generally) without the written consent of the Company, if the effect of
     such acquisition would be to increase the Voting Power of all Voting Stock
     then owned by the Investor and any Affiliated Entity or which it has a
     right to acquire to an amount equal to 20% or more of the Total Voting
     Power of the Company (as defined in Section 13) at such time, provided that
     (a) the limitation of "20% or more" shall be changed to "25% or more" upon
     either the Spin-Off or after the Company has a fiscal year with pre-tax
     income and (b) the limitation shall not apply to the extent Investor is
     purchasing New Securities as permitted under Section 8 of this Agreement.

15.  Amendment of Section 13.2 of Stock Purchase Agreement.

     15.1 Section 13.2 of the Stock Purchase Agreement is hereby amended and
     restated in its entirety to provide as follows:

     13.2 Termination and Covenants. If not earlier terminated by specific terms
          -------------------------
          of such Sections, the provisions of Section 8 shall terminate on the
          earlier of (i) the effective date of a Registration Statement filed
          with the Securities and Exchange Commission pursuant to the Securities
          Act covering securities of the Company, (ii) seven (7) years after the
          Closing Date or (iii) such time as Investor and any affiliate or
          subsidiary of Investor own in the aggregate less than five percent
          (5%) of the then outstanding Voting Stock of the Company and the
          provisions of Section 10 shall terminate seven (7) years after the
          Closing Date.

    15.2 The parties acknowledge and agree that the provisions of Section 5 of
    this Agreement shall apply in the event of any issuance of New Securities
    in connection with

                                       10
<PAGE>

         the Spin-Off, irrespective of the effective date of the registration
         statement filed in connection therewith.

16.      Indemnification Agreement. Prior to the completion of the Spin-Off,
         CCSI shall enter into an indemnification agreement substantially in the
         form attached hereto as Exhibit C, and in definitive form and substance
         satisfactory to Sundance or ENA, that provides indemnification from
         CCSI, to the fullest extent permitted by the Delaware General
         Corporation Law, to any person who has been selected by Sundance to
         serve as a director of CCSI pursuant to the provisions of Section 9 of
         the Stock Purchase Agreement.

17.      Waiver of Exchange Right. Sundance hereby waives its rights under
         Section 1.2 of that certain Stockholders' Agreement dated as of January
         14, 1988, among Catalytica, CCSI and Sundance (as successor in interest
         to Enron Ventures Corp.) arising as a result of the merger of
         Catalytica pursuant to the Catalytica/DSM Merger Agreement effective
         concurrently with the merger.

18.      Effectiveness of Certain Agreements.  The agreements of Sundance and
         ENA pursuant to Sections 1, 2, 3, 4, 5, 6, 7, 8 and 17 hereof are
         subject to and conditioned upon execution of the definitive agreement
         referred to in Section 16 above, and, in the case of Sections 3, 4, 5,
         6, 7, 8 and 17, completion of the Spin-Off. In the event the Spin-Off
         is not consummated by December 31, 2000, all of such agreements in
         Sections 1, 2, 3, 4, 5, 6, 7, 8 and 17 shall be of no force and effect.
         All other agreements of the parties hereto shall be effective upon the
         execution date of this Agreement, unless expressly provided otherwise
         herein.

19.      CCSI Consent. CCSI hereby consents to Amendment No. 1 to the Xonon
         Technology Implementation Agreement in the form attached to this
         Agreement as Exhibit B effective upon the execution date of this
         Agreement. In addition, CCSI agrees that in the event any credit right
         in respect of the purchase of Xonon-equipped GE turbines shall vest or
         inure in CCSI or any of its affiliates, CCSI shall assign such rights
         to any of the permitted assignees thereof described in Sections 4.5 and
         7.2 of the XTIA as directed by ENA, provided that CCSI and any of its
         affiliates waive any right to receive the amounts provided for in the
         last sentence of Section 1.2 of the Option Repurchase Agreement in
         respect of such assignment and neither ENA nor any assignee of the
         credits shall have any obligation to CCSI or its affiliates with
         respect to such assignment. CCSI and its affiliates further agree to
         take such steps as may be required to vest the benefit of any credits
         arising under Section 4.3 of the XTIA in the permitted assignees of
         such rights described in Sections 4.5 and 7.2 of the XTIA as directed
         by ENA.

20       Arbitration/Damages Limitation. Each of the parties hereto shall have
         the right to apply to a court to enjoin any breach of this agreement.
         Excepting the right of the parties to seek such relief, all claims and
         matters in question arising out of this Agreement or the relationship
         between the parties created by this Agreement, whether sounding in
         contract, tort or otherwise, shall be resolved by binding arbitration
         pursuant to the Federal Arbitration Act. The arbitration shall be
         administered by the American Arbitration Association ("AAA"). There
         shall be three arbitrators. Sundance and ENA on the one hand and CCSI
         and Catalytica on the other shall each designate an arbitrator, who
         need

                                       11
<PAGE>

          not be neutral, within 30 days of receiving notification of the filing
          with the AAA of a demand for arbitration. The two arbitrators so
          designated shall elect a third arbitrator. If the parties fail to
          designate an arbitrator within the time specified or the selected
          arbitrators fail to designate a third arbitrator within 30 days of
          their appointments, the arbitrators so failed to be selected shall be
          appointed by the AAA. It is expressly agreed that the arbitrators
          shall have no authority to award punitive, consequential or exemplary
          damages, the parties hereby waiving their right, if any, to recover
          punitive, consequential or exemplary damages, either in arbitration or
          in litigation, in connection with any breach or default by the other
          party under this Agreement.

21.      Miscellaneous. This Agreement shall be governed by the laws of the
         State of Delaware applicable to contracts made and to be performed in
         Delaware by Delaware residents. This Agreement sets forth the entire
         agreement among the parties relating to the subject matter hereof and
         supercedes any and all prior and contemporaneous agreements,
         discussions and correspondence among the parties. The parties
         acknowledge and agree that any breach of the terms of this Agreement
         would give rise to irreparable harm for which money damages would not
         be an adequate remedy and accordingly the parties agree that, in
         addition to any other remedies, each shall be entitled to enforce the
         terms of this Agreement by a decree of specific performance without the
         necessity of proving the inadequacy of money damages as a remedy. The
         parties shall use all commercially reasonable efforts promptly to take,
         or cause to be taken, all other actions and do, or cause to be done,
         all other things necessary or desirable to effect the subject matter of
         this Agreement.

                                       12
<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

Catalytica, Inc.                             Catalytica Combustion Systems, Inc.

By:                                          By:
   --------------------------------             --------------------------------
Name: Larry w. Briscoe                       Name: Larry W. Briscoe
     ------------------------------               ------------------------------
Title: Chief Financial Officer               Title: Chief Financial Officer
       ----------------------------                -----------------------------

Sundance Assets, L.P.                        Enron North America Corp.

By:  Ponderosa Assets, L.P.,
     Its General Partner                     By:
                                                --------------------------------
                                             Name:
                                                  ------------------------------
By:  Enron Ponderosa Management              Title:
     Holdings, Inc., its General Partner           -----------------------------

By:
   --------------------------------
Name:
     ------------------------------
Title:
      -----------------------------

                                       13

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