Document:

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              LICENSE, DEVELOPMENT AND COMMERCIALIZATION AGREEMENT

       THIS LICENSE, DEVELOPMENT AND COMMERCIALIZATION AGREEMENT (the
"Agreement") is made effective as of the 2nd day of March, 2000 (the "Effective
Date") by and between GUILFORD PHARMACEUTICALS INC., a Delaware corporation
having its principal place of business at 6611 Tributary St., Baltimore,
Maryland, U.S.A. 21224 ("Guilford"), on the one hand, PROQUEST PHARMACEUTICALS
INC., a Kansas corporation having an address at 4913 Stoneback Place, Lawrence,
Kansas 66047 ("ProQuest"). Guilford and ProQuest are sometimes referred to
herein individually as a "Party" and collectively as the "Parties". References
to Guilford and ProQuest shall include their respective Affiliates, as defined
herein.

                                    RECITALS

       1.     Pursuant to a License Agreement, dated April 2, 1999 (the "KU
License"), between ProQuest and the University of Kansas Center for Research,
Inc. ("KUCR"), ProQuest holds certain rights with respect to a proprietary
compound, PQ-1002, as further described in the attached Schedule 1 ("PQ-1002"),
and related intellectual property as further described in the attached Schedule
2, which it is using to develop a pro-drug of propofol, currently marketed for
use as an anesthetic.

       2.     Guilford possesses research, development and commercialization
capabilities sufficient to perform the activities contemplated in this
Agreement.

       3.     The Parties desire to enter into this Agreement pursuant to which
(a) ProQuest shall grant to Guilford an exclusive license to PQ-1002 and certain
related compounds; and (b) Guilford agrees to develop and commercialize such
products, all on the terms and conditions of this Agreement.

       NOW, THEREFORE, in consideration of the foregoing and of the mutual
covenants and agreements hereinafter set forth, the parties hereto agree as
follows:

                             ARTICLE 1. DEFINITIONS

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

       1.1    "ACT" shall mean the U.S. Food, Drug and Cosmetic Act, as amended,
and the regulations promulgated thereunder.

       1.2    "AFFILIATE" shall mean a Person that, directly or indirectly,
through one or more intermediates, controls, is controlled by, or is under
common control with the Person specified.

       1.3    "AGREEMENT COMPOUND" shall mean (i) PQ-1002; (ii) any other
compound in ProQuest's Control on the Effective Date or during the term of this
Agreement which is a prodrug of propofol or of a propofol analog; or (iii) any
other compound which Guilford (and/or a sublicensee of Guilford's rights under
this Agreement) may derive from ProQuest Patent Rights or ProQuest Know-how and
that delivers (A) the propofol nucleus; or (B) a propofol analog. "Propofol
analog" as used in this Agreement shall mean any compound that is derived from
or similar to the propofol nucleus and is intended or expected to have similar

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pharmacological properties to propofol. "Propofol nucleus" as used in this
Agreement shall mean 2,6-di-isopropylphenol.

       1.4    "BANKRUPTCY EVENT" shall mean, with respect to a particular Party,
that voluntary or involuntary proceedings by or against such Party are
instituted in bankruptcy or under any insolvency law, or a receiver or custodian
is appointed for such, or proceedings are instituted by or against such Party
for corporate reorganization or the dissolution of such Party, which
proceedings, if involuntary, shall not have been dismissed within sixty (60)
days after the date of filing, or such Party makes an assignment for the benefit
of its creditors, or substantially all of the assets of such Party are seized or
attached and not released within sixty (60) days thereafter.

       1.5    "COMMERCIALIZE" OR "COMMERCIALIZATION" shall mean those activities
relating to the promotion, marketing and sale of any Agreement Compound.

       1.6    "COMMERCIALLY REASONABLE EFFORTS" shall mean efforts and resources
commonly used in the research-based pharmaceutical industry for a product at a
similar stage in its product life or similar market potential, taking into
account efficacy, the competitiveness of alternative products in the
marketplace, the degree of intellectual property protection available for the
product (whether to Guilford or to Third Parties), the likelihood of regulatory
approval given the regulatory structure involved, the profitability of the
product including the royalties payable to licensors of Patent Rights,
alternative products and other relevant factors. Commercially Reasonable Efforts
shall be determined on a market-by-market basis for a particular product, and it
is anticipated that the level of effort will change over time, reflecting
changes in the status of the product and the market involved. For the avoidance
of doubt, the Parties agree that Guilford (or its Affiliates or sublicensees)
may elect not to sell a Program Product in a particular country if there is no
patent covering same in such country.

       1.7    "CONFIDENTIAL INFORMATION" shall mean with respect to a particular
Party, non-public proprietary data, information and/or materials that are owned
or licensed in whole or in part by such Party (including, without limitation,
the terms and conditions of the KU License, and the proprietary business, patent
prosecution, process, technical information and data specified in Section 6.01
of the KU License).

       1.8    "CONSENT AND AGREEMENT" shall mean the Consent and Agreement,
dated as of even date hereof, as the same may be amended from time to time,
among Guilford, ProQuest and KUCR, the form of which is attached hereto and made
a part hereof as Exhibit C.

       1.9    "CONTROLS" OR "CONTROLLED" shall mean, with respect to
intellectual property, possession of the ability to grant licenses or
sublicenses without violating the terms of any agreement or other arrangement
with, or the rights of, any Third Party.

       1.10   "DETERMINATION DATE" shall mean the earlier of (i) the date on or
before sixty (60) days following Guilford's commencement of the Infusion Study
contemplated in Section 3.2, or (ii) the date that Guilford delivers written
notice to ProQuest and the Escrow Agent as set forth in Section 5.2.

       1.11   "DEVELOP" OR "DEVELOPMENT" shall mean those activities related to
the clinical development of an Agreement Compound including those activities
related to the obtainment of Regulatory Approvals for the clinical testing and
commercial sale of an Agreement Compound. Development activities will
specifically include (i) all activities relating to toxicology, in vitro assays,
animal models of clinical efficacy and other

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studies required to support a Regulatory Filing to initiate clinical testing of
an Agreement Compound and (ii) all activities relating to clinical studies and
determination of safety and efficacy of an Agreement Compound in humans to
support a Regulatory Filing to initiate Commercialization of an Agreement
Compound.

       1.12   "EFFECTIVE DATE" shall mean the date of this Agreement first above
written.

       1.13   "ESCROW AGREEMENT" shall mean the Escrow Agreement, dated of even
date hereof, as the same may be amended from time to time, between Guilford and
ProQuest, the form of which is attached hereto and made a part hereof as Exhibit
B.

       1.14   "EUROPE" or "EUROPEAN COUNTRY" shall mean, for purposes of
Sections 3.3, 5.3(c)(ii) and 8.6, any of the following countries: Austria,
Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg,
Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

       1.15   "EXCLUSIVE COOPERATION FIELD" shall mean the Development of
PQ-1002 or any other Agreement Compound, either alone or in combination with any
other compound, and irrespective of indication, formulation, or other factors,
but only in the field of human pharmaceutical or veterinary applications.

       1.16   "EXCLUSIVE LICENSE" shall mean an exclusive, worldwide,
royalty-bearing license, subject to the University of Kansas's retained rights
under Sections 2.03 and 2.04 of the KU License.

       1.17   "FDA" shall mean the Federal Food and Drug Administration of the
United States Department of Health and Human Services or any successor agency
thereof.

       1.18   "FORCE MAJEURE" shall mean any occurrence beyond the reasonable
control of a Party that prevents or substantially interferes with the
performance by the Party of any of its obligations hereunder. Without limiting
the generality of the foregoing, any of the following: any act of God, flood,
fire, explosion, breakdown of plant, earthquake, strike, lockout, labor dispute,
casualty or accident, war, revolution, civil commotion, acts of public enemies,
blockage or embargo, injunction, law, order, proclamation, regulation,
ordinance, demand, regulatory delay, or requirement of any government or of any
subdivision, authority or representative of any such government, inability to
procure or use materials, labor, equipment, transportation, or energy sufficient
to meet manufacturing needs without the necessity of allocation, or clinical,
technical, medical, scientific, or manufacturing delays, or any other cause
whatsoever, whether similar or dissimilar to those above enumerated, provided
that in all such cases it is beyond the reasonable control of such Party, shall
constitute Force Majeure.

       1.19   "GOVERNANCE COMMITTEE" shall have the meaning defined in Article
4.

       1.20   "GUILFORD KNOW-HOW" shall mean any and all of Guilford's
techniques and data, including, but not limited to, the identity of and
information relating to PQ-1002 or any other Agreement Compound, inventions,
practices, methods, knowledge, skill, experience, test data including
pharmacological, toxicological, pharmacokinetic and clinical test data,
analytical and quality control data, marketing, pricing, distribution, cost,
sales, manufacturing, patent and legal data, assays and biological materials
relating to PQ-1002 or any other Agreement Compound, and any other information
reasonably necessary for Guilford to Develop and Commercialize PQ-1002 or any
other Agreement Compound and to otherwise perform its obligations under this
Agreement which (i) Guilford discloses to ProQuest under this Agreement or (ii)

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Guilford Controls on the Effective Date and/or during the term of this
Agreement. Guilford Know-how shall exclude Guilford Patent Rights.

       1.21   "GUILFORD PATENT RIGHTS" shall mean the Patent Rights which cover
a composition of matter, use, method, process or other matter relating to any
Agreement Compound or Program Product, or derived from ProQuest Patent Rights or
ProQuest Know-how, which Patent Rights are Controlled by Guilford from and after
the Effective Date and during the term of this Agreement.

       1.22   "IND" shall mean an "Investigational New Drug Application," as
defined in the Act, and all supplements thereto, covering an Agreement Compound.

       1.23   "LICENSE FIELD" shall mean the research, Development or
Commercialization or any other use (including manufacture, marketing, sale or
distribution), for profit or not-for-profit, of any Agreement Compound, but only
for human pharmaceutical or veterinary applications.

       1.24   "MILESTONES" OR "MILESTONE PAYMENTS" shall mean the payments to be
made to ProQuest by Guilford upon occurrence of certain events as set forth in
Article 5.

       1.25   "NDA" shall mean a "New Drug Application," as defined in the Act,
and all supplements thereto, covering an Agreement Compound.

       1.26   "NET SALES" shall mean gross sales revenues from the sale or other
supply of Program Products by Guilford, its Affiliates, sublicensees or
non-Affiliated distributors to non-Affiliated Third Parties, less trade
discounts (including without limitation, cash discounts, prompt payment or
volume discounts, chargebacks from wholesalers, other allowances granted to
customers or wholesalers of products and payments to government agencies,
whether in cash or trade, rebates, retroactive price reductions or allowances
actually allowed or granted from the billed amount), credits or allowances
actually granted upon claims, rejections or returns of Program Products
(including pursuant to recalls), and sales, value-added and other taxes actually
paid based on sales price (when included in gross sales), but not including
taxes when assessed on income derived from such sales. In order to insure
ProQuest the full royalty payments contemplated hereunder, Guilford agrees that
in the event any Program Product is sold or otherwise transferred to an
Affiliate or a sublicensee, or to a corporation, firm or association with which
Guilford has an arrangement which could result in an artificial reduction in the
price paid by such party to Guilford for an Program Product (e.g., such
purchaser has an option to purchase Guilford's stock, or has actual ownership of
Guilford stock, or an arrangement with Guilford involving division of profits or
special rebates or allowances respecting such Program Product) (collectively,
"Affiliated Purchasers"), the royalties to be paid hereunder for such Program
Product shall be based upon the greater of: (1) the net selling price at which
such Affiliated Purchaser resells such Program Product to the end-user; (2) the
fair market value of the Program Product being sold at that level of
distribution; or (3) the net price paid by such Affiliated Purchaser for Program
Product. Notwithstanding anything to the contrary in this Section 1.26, if a
Program Product is distributed or invoiced for a discounted price substantially
lower than customary in the trade or distributed at no cost to Affiliates or
otherwise for bona fide business, scientific or charitable reasons (including
without limitation in connection with clinical trials, compassionate sales or an
indigent program), Net Sales shall be based on the actual price received (which
may be a discounted price, or even $0, if distributed free in such bona fide
cases). In the event that Guilford, its Affiliate or its sublicensee sells a
Program Product in combination with other active ingredients or substance, the
Net Sales for purposes of royalty payments shall be based on the sales revenues
received with respect to the sales price of the component(s) consisting of such
Program Product, and if such active components are not

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priced separately, based on such sales price as Guilford or its Affiliate may
reasonably allocate to the Program Product included in such combination, subject
to the reasonable approval of ProQuest.

       1.27   "PATENT RIGHTS" shall mean all patents and patent applications and
foreign counterparts thereof, in all cases in any jurisdiction in the world,
including any existing or future extensions, registrations, confirmations,
reissues, continuations, divisions, substitutions, revalidations,
continuations-in-part, re-examinations or renewals of such patent or
application, including without limitation Supplementary Protection Certificates
or the equivalent thereof.

       1.28   "PERSON" shall mean any individual, firm, corporation,
partnership, limited liability company, trust, unincorporated organization or
other entity or a government agency or political subdivision thereto, and shall
include any successor (by merger or otherwise) of such Person.

       1.29   "PROGRAM PATENT RIGHTS" shall mean any ProQuest Patent Rights or
Guilford Patent Rights, and includes any Patent Rights, the subject of which is
an invention conceived by either Guilford or ProQuest, or by Guilford and
ProQuest jointly, or by a Third Party on behalf of Guilford and/or ProQuest
pursuant to a contractual arrangement, either solely or jointly with Guilford
and/or ProQuest, during the term of this Agreement or a 12 month period
thereafter, and related to PQ-1002 or any other Agreement Compound.

       1.30   "PROGRAM PRODUCT" shall mean a product, the manufacture, use,
sale, offer to sell or importation of which would (but for a right granted or
retained by KUCR, ProQuest, Guilford or a sublicensee or other partner of
Guilford) infringe one or more claims of a valid, issued patent included in the
Program Patent Rights if any such activities were conducted in (i) the country
of sale, (ii) the United States, or (iii) each of Germany, France and the United
Kingdom.

       1.31   "PROQUEST KNOW-HOW" shall mean any and all of ProQuest's
techniques, data and other information relating to PQ-1002 or any other
Agreement Compound (including, but not limited to, the identity of and
information relating to PQ-1002 or any other Agreement Compound, inventions,
practices, methods, knowledge, skill, experience, test data including
pharmacological, toxicological, pharmacokinetic and clinical test data,
analytical and quality control data, marketing, pricing, distribution, cost,
sales, manufacturing, patent and legal data, assays and biological materials,
and any other information reasonably necessary for Guilford to Develop and
Commercialize PQ-1002 or any other Agreement Compound), which ProQuest Controls
on the Effective Date and/or during the term of this Agreement. ProQuest
Know-how shall exclude ProQuest Patent Rights.

       1.32   "PROQUEST PATENT RIGHTS" shall mean Patent Rights which cover a
composition of matter, use, method, process or other matter relating to PQ-1002
or any other Agreement Compound, which is owned or Controlled by ProQuest as of
the Effective Date or during the term of this Agreement, including any joint
interest it may have from time to time in Program Patent Rights, including
without limitation the patent applications set forth on Schedule 2 attached
hereto.

       1.33   "REGULATORY APPROVAL" shall mean any approvals (including, where
necessary for the marketing, use or other distribution of a drug in a regulatory
jurisdiction, pricing and reimbursement approvals), licenses, registrations, or
authorizations or equivalents necessary for the manufacture, use, storage,
import, export, clinical testing, transport, marketing, sale and distribution of
a Program Product or Agreement Compound in a regulatory jurisdiction anywhere in
the world (including without limitation authorization or

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authority to distribute a drug pursuant to laws, regulations or other permission
covering the distribution of drugs on an orphan drug, named patient
compassionate sale or similar bases).

       1.34   "REGULATORY FILINGS" shall mean, collectively, INDs, Biologics
License Applications, Drug Master Files, NDAs and/or any other comparable
filings as may be required by any federal, state or local regulatory agency,
department, bureau or other governmental entity, in order to obtain Regulatory
Approvals.

       1.35   "ROYALTY" shall have the meaning defined in Section 6.1 of this
Agreement.

       1.36   "STOCK PURCHASE AGREEMENT" shall mean the Stock Purchase
Agreement, dated as of even date herewith, as the same may be amended from time
to time, between Guilford and ProQuest, the form of which is attached hereto and
made a part hereof as Exhibit A.

       1.37   "THIRD PARTY" shall mean any Person other than Guilford or
ProQuest or their respective Affiliates, including governmental agencies and
bodies.

       1.38   "THIRD PARTY ROYALTIES" shall mean royalties payable by Guilford,
its Affiliates or sublicensees to a non-Affiliate Third Party (or multiple
non-Affiliate Third Parties) to make, have made, use, sell, offer for sale or
import Agreement Compounds where the royalty payable to such non-Affiliate Third
Party is based on Patent Rights owned or Controlled by a Third Party.

       Capitalized terms not defined in this Article 1 shall have the meaning
ascribed to them as set forth in this Agreement below.

                    ARTICLE 2. EXCLUSIVITY AND LICENSE GRANT

       2.1    EXCLUSIVITY. Subject to the terms and conditions of this
Agreement, each of Guilford and ProQuest agrees to work exclusively with the
other during the term of this Agreement in the Exclusive Cooperation Field, and
neither it nor any of its Affiliates will directly or indirectly conduct, have
conducted or fund any research, development, regulatory, manufacturing or
commercialization activity within the Exclusive Cooperation Field, except as
otherwise agreed by the Parties or permitted in this Agreement.

       2.2    LICENSE GRANT TO GUILFORD. Subject to the terms and conditions of
this Agreement, ProQuest hereby grants to Guilford an Exclusive License,
including under the ProQuest Patent Rights, to make, have made, use, sell, offer
to sell and import PQ-1002, and to the extent any license is necessary to engage
in such activities, any other Agreement Compound in the Licensed Field
(provided, however, that Guilford shall not be entitled to practice its rights
under this Agreement with respect to an Agreement Compound other than PQ-1002
unless and until the Parties have agreed on the appropriate Milestones,
Milestone Payments and Royalties for such Agreement Compound, as contemplated in
Sections 5.3(d) and 6.4(i) below). Guilford may sublicense, and grant the right
to further sublicense, its rights licensed from ProQuest under this Agreement.
Guilford shall provide a copy of any such sublicense agreement to ProQuest
within thirty (30) days of its effective date. Each such sublicense shall be
consistent with the terms of this Agreement, except as may otherwise by agreed
in writing by the Parties.

       2.3    TRANSFER OF PROQUEST KNOW-HOW. ProQuest represents and warrants
that no later than ten (10) days following the Effective Date, it will transfer,
disclose or otherwise make available to Guilford, or

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will have transferred, disclosed or made available, all existing ProQuest
Know-how for use by Guilford to perform the "Infusion Experiment" contemplated
in Section 3.2 below and described in Schedule 3 hereto, and to otherwise
Develop and Commercialize PQ-1002. ProQuest further agrees and covenants to
promptly transfer, disclose or make available, or have transferred, disclosed or
made available, all ProQuest Know-how within its Control, or which it can
disclose without breaching a contractual obligation to a Third Party, related to
any Agreement Compound during the term of this Agreement to enable Guilford to
research, Develop and Commercialize any Agreement Compound.

         ARTICLE 3. SCOPE; ALLOCATION OF RESPONSIBILITIES OF THE PARTIES

       3.1    COOPERATION UNDERTAKING; EXCLUSIVITY. During the term of this
Agreement, ProQuest agrees to cooperate with Guilford as Guilford may reasonably
request, at Guilford's expense for ProQuest's out-of-pocket expenses, in order
to enable or facilitate the research, Development and Commercialization by
Guilford of PQ-1002 or any other Agreement Compound in accordance with the terms
of this Agreement. Without limiting the generality of the foregoing, during the
term of this Agreement, ProQuest agrees to promptly disclose to Guilford all
ProQuest Patent Rights, and ProQuest Know-how Controlled by it or which ProQuest
can disclose to Guilford without breaching a contractual obligation to a Third
Party. ProQuest further agrees not to engage in research, Development or
Commercialization of Agreement Compound except under this Agreement.

       3.2    INFUSION STUDY. Following mutual execution and delivery of this
Agreement, Guilford will conduct or cause to be conducted a preclinical animal
chronic infusion study with PQ-1002 in the manner set forth in Schedule 3
attached hereto (the "Infusion Study"). Guilford agrees to use Commercially
Reasonable Efforts to commence the Infusion Study as soon as practicable
following the Effective Date, but the Parties acknowledge and understand that
commencement of the Infusion Study will depend on the availability of Guilford's
contract research organization. Guilford agrees to use Commercially Reasonable
Efforts to complete the Infusion Study and share any results thereof with
ProQuest on or before the Determination Date.

       3.3    GUILFORD DEVELOPMENT AND COMMERCIALIZATION UNDERTAKING. During the
term of this Agreement, Guilford agrees, using Commercially Reasonable Efforts,
to conduct all Development and Commercialization of PQ-1002, whether
independently or in collaboration with one or more corporate partners as
Guilford may choose in its sole and absolute discretion. Guilford shall have the
right to control all aspects of such Development and Commercialization.
Specifically, Guilford agrees to use Commercially Reasonable Efforts to:

              (i)    commence the first human clinical trial (whether under an
                     IND or otherwise) of PQ-1002 no later than 18 months
                     following the Determination Date; and

              (ii)   file the first NDA for PQ-1002 no later than the fifth
                     anniversary of the Determination Date.

       If Guilford in the exercise of Commercially Reasonable Efforts determines
that another Agreement Compound is a more desirable candidate for Development or
Commercialization than PQ-1002, then Guilford in its sole discretion may elect
to Develop and Commercialize such an Agreement Compound in lieu of PQ-1002, in
which event Guilford shall use Commercially Reasonable Efforts to so Develop and
Commercialize such Agreement Compound (subject to Section 2.2 above and Sections
5.3(d) and 6.4(i) below). Guilford, either directly or through any corporate
partner(s) it chooses, shall be responsible for paying all expenses

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associated with the Development and Commercialization of PQ-1002 (or any other
Agreement Compound, if applicable).

       If and when PQ-1002 (or another Agreement Compound, if applicable) has
been successfully Developed, Guilford agrees to use its Commercially Reasonable
Efforts to obtain the necessary Regulatory Approvals and market it in the United
States, Europe and Japan, as well as such other regions and countries as
Guilford may deem it commercially reasonable to do so. In so doing, Guilford
shall have the right to grant one or more exclusive or non-exclusive marketing,
sales, sales agency and/or distribution rights.

       3.4    REGULATORY MATTERS. Without limiting its rights under this
Agreement, Guilford in its sole discretion will have complete control,
authority, and responsibility for the regulatory strategies adopted for the
Development and Commercialization of any Agreement Compound. Guilford will be
responsible for and will own all Regulatory Filings and Regulatory Approvals for
any Agreement Compound, except as otherwise provided in Section 10.4(b).

       3.5    MANUFACTURING. Without limiting its rights under this Agreement,
Guilford in its sole discretion will have complete control, authority and
responsibility for manufacturing of an Agreement Compound, whether directly or
through Affiliates, contracted sublicensees or other Third Parties.

       3.6    HART-SCOTT RODINO ANTITRUST IMPROVEMENTS ACT OF 1976. Each of
ProQuest and Guilford shall cooperate with one another in determining whether
any filing of notification and report forms under the Hart-Scott-Rodino
Antitrust Improvements Act of 1976, as amended, is required in connection with
the consummation of the transactions contemplated by this Agreement and the
Stock Purchase Agreement, and preparing and making any such filing and
furnishing information required in connection therewith. If such a filing is
required, each Party shall be responsible for preparing and making its own
filing, and each Party shall be responsible for paying its own costs and
expenses associated with making the filing. Guilford shall be responsible for
the fee required to be paid in connection with any such filing.

                              ARTICLE 4. GOVERNANCE

       4.1    GOVERNANCE COMMITTEE. The development of PQ-1002 (or another
Agreement Compound, if applicable), and the relationship between the Parties,
will be periodically reviewed by a Governance Committee which shall be composed
of at least five (5) persons, two (2) of whom shall be representatives of
ProQuest, and the remainder of which will be representatives of Guilford. Each
Party shall, no later than thirty (30) days following the Effective Date,
appoint its representatives to the Governance Committee by giving written notice
to the other Party. The Governance Committee will be chaired by one
representative designated by Guilford. Members of the Governance Committee shall
serve in such capacities, on such terms and conditions, and for such duration as
shall be determined by the Party appointing same. Each Party may designate an
alternate member to serve temporarily in the absence of a permanent member
designated by such Party. Each Party may from time to time upon prior written
notice change its representative members on the Governance Committee

       4.2    MEETINGS OF THE GOVERNANCE COMMITTEE. Unless otherwise agreed by
the Parties from time to time, the Governance Committee shall hold meetings at
such times and places as shall be determined by the Parties, but in no event
shall such meetings be held less frequently than once every calendar quarter,

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commencing no more than sixty (60) days following the Effective Date. Meetings
may be conducted in person or by conference telephone or video conference.
Before the conclusion of a meeting, the date and location of the next meeting
will be decided by the Parties. The Chairperson may in his/her discretion decide
that minutes of the meeting be kept, by designating any attendee to serve as
secretary of the meeting.

       4.3    PURPOSE OF THE GOVERNANCE COMMITTEE. The Governance Committee
shall serve as a forum for overseeing the relationship of the Parties arising
out of this Agreement and for jointly reviewing the Development and
Commercialization of PQ-1002 (or any other Agreement Compound), and shall
perform such other functions as the Parties may agree in order to further the
purposes of this Agreement. At least quarterly at a Governance Committee
meeting, Guilford will deliver a report on the Development and Commercialization
of PQ-1002 (or any other Agreement Compound), and Guilford will (either at such
meeting or as a follow up to such meeting) provide such further information
(including Guilford Know-how) relating to the Development and Commercialization
of PQ-1002 (or any other Agreement Compound) as ProQuest may reasonably request,
all subject to Article 7 below.

       4.4    AGENDAS. Each Party will use Commercially Reasonable Efforts to
notify the other at least three (3) business days prior to the date of a meeting
of the Governance Committee, proposing the agenda items it wishes to discuss at
such meeting. Notwithstanding the foregoing, the Governance Committee shall be
free to consider any matter related to this Agreement.

       4.5    INDEPENDENT CONTRACTORS. Subject to the terms of this Agreement,
the activities and resources of each Party shall be managed by such Party,
acting independently and in its individual capacity and the Parties shall have a
relationship of independent contractors with respect to each other. No term or
condition of this Agreement is intended to create nor shall any such term or
condition create any fiduciary duty on the part of either Party for the benefit
of the other, and shall not require either Party to expend either funds or
efforts or commit resources other than as explicitly agreed in this Agreement.

                         ARTICLE 5. FEES AND MILESTONES

       5.1    PAYMENT AT SIGNING. As payment for the entering into of this
Agreement and the Stock Purchase Agreement, Guilford shall pay simultaneously
with the execution and delivery of this contract (i) by wire transfer of
immediately available funds to the account of ProQuest the sum of Five Hundred
Thousand Dollars ($500,000) and (ii) by check or wire transfer to the Escrow
Agent, the sum of Five Hundred Thousand Dollars ($500,000) which shall be held
by the Escrow Agent in accordance with the terms of the Escrow Agreement.

       5.2    DETERMINATION DATE. On or before the Determination Date, Guilford
shall determine whether it desires to proceed with the Development and
Commercialization of an Agreement Compound pursuant to this Agreement and shall
provide written instructions to the Escrow Agent advising it of its decision.
The Escrow Agent shall, upon such instruction and in accordance with the terms
of the Escrow Agreement, release the escrowed funds (i) to ProQuest at a closing
to occur no later than ten (10) days after the Determination Date (the "First
Closing") in the event that Guilford desires to proceed or (ii) to Guilford in
the event that Guilford does not desire to proceed, provided that in either
event, ProQuest shall be entitled to any interest (or other income or gains)
earned on the escrowed funds. In the event that Guilford desires to proceed, the
$500,000 payment to ProQuest (referred to in Section 5.1(i) above) shall be
applied towards the purchase of Common

                                     - 9 -
<PAGE>   10

Stock at the First Closing, as set forth in the Stock Purchase Agreement. In the
event that Guilford does not desire to proceed, then ProQuest shall retain such
$500,000 payment and shall have no obligation to issue Common Stock or convey
other property to Guilford with respect to such payment.

       5.3    MILESTONE PAYMENTS.

       (a)    DEVELOPMENT MILESTONES FOR PQ-1002. As additional consideration,
Guilford shall pay the following amounts at each Additional Closing (as defined
in the Stock Purchase Agreement) to occur after completion of the following
development milestones (each a "Milestone") with respect to PQ-1002 (whether
Developed by Guilford or its Affiliate or sublicensee):

              (i)    $250,000 upon the Additional Closing following dosing of
                     the first human; and

              (ii)   $750,000 upon the Additional Closing following dosing of
                     the first patient in a Phase II clinical trial; and

              (iii)  $1 million upon the Additional Closing following dosing of
                     the first patient in a Phase III clinical trial.

       Except as set forth in the Stock Purchase Agreement, all milestone
payments set forth above shall be deemed payment for the purchase of ProQuest
common stock and, in accordance with the Stock Purchase Agreement, Additional
Closings shall be held following achievement of each Milestone. The price per
share shares of Common Stock to be issued upon achievement of each Milestone
shall be a price per share equal to 110% of the price per share of Common Stock
(or conversion price per share of securities convertible into the Company's
Common Stock) issued in the Company's most recent "Qualified Equity Infusion"
(as that term is defined in the Stock Purchase Agreement) prior to the relevant
Additional Closing.

       (b)    NDA OR EQUIVALENT FILING MILESTONE. Guilford shall pay to ProQuest
$2 million following submission of an NDA (or equivalent application for
Regulatory Approval) which would enable the general marketing of PQ-1002 in a
particular country. Of this $2 million, $1 million shall be paid as cash within
five (5) business days following achievement of this Milestone, and, except as
otherwise set forth in the Stock Purchase Agreement, $1 million shall be deemed
payment for the purchase of ProQuest common stock upon the achievement of this
Milestone, payable at an Additional Closing in accordance with the Stock
Purchase Agreement.

       (c)    NDA OR EQUIVALENT APPROVAL MILESTONE. Guilford shall pay the
following amounts in cash (which shall not be deemed payment towards a purchase
of ProQuest common stock) to ProQuest within five (5) business days following
achievement of the following Milestones for an Agreement Compound (whether by
Guilford or its Affiliates or sublicensees) in the following territories:

              (i)    $5 million upon receipt of NDA clearance and any other
                     Regulatory Approvals needed to enable the marketing and
                     selling of PQ-1002 generally in the United States;

              (ii)   $3 million upon receipt of all final Regulatory Approvals
                     needed from the first European Country to enable the
                     marketing and selling of PQ-1002 generally in that European
                     Country; and

                                     - 10 -
<PAGE>   11

              (iii)  $1 million upon receipt of all final Regulatory Approvals
                     needed to enable the marketing and selling of PQ-1002
                     generally in Japan.

       (d)    MILESTONE PAYMENTS FOR OTHER AGREEMENT COMPOUNDS. If Guilford
desires to Develop any other Agreement Compound in lieu of or in addition to
PQ-1002, the Parties must first agree in writing on any Milestone Payments for
the Development of such Agreement Compound.

       (e)    NOTIFICATION OF MILESTONES. No later than five (5) business days
following the achievement of each Milestone, Guilford shall notify ProQuest in
writing that such Milestone has occurred.

                              ARTICLE 6. ROYALTIES

       6.1    ROYALTIES. Guilford agrees to pay ProQuest a running royalty on
worldwide Net Sales of PQ-1002 ("Royalty") in the following amounts:

              (i)    five percent (5%) of Net Sales on the first One Hundred
                     Million Dollars ($100,000,000) in worldwide Net Sales in
                     any calendar year;

              (ii)   seven percent (7%) on the next One Hundred Million Dollars
                     (i.e., between $100,000,000 and $200,000,000) in worldwide
                     Net Sales in any calendar year; and

              (iii)  nine percent (9%) on all amounts of worldwide Net Sales in
                     excess of Two Hundred Million Dollars ($200,000,000) in any
                     such calendar year.

       6.2    THIRD PARTY ROYALTY CREDIT. On a country by country basis, fifty
percent (50%) of any Third Party Royalties paid by Guilford will be creditable
against Royalties payable to ProQuest under this Agreement. Credit for Third
Party Royalties will be made on a quarterly basis; provided, however, that no
such credit shall reduce the amount of Royalties paid by Guilford for a
particular calendar quarter by more than 50%.

       6.3    TERM OF ROYALTY. Royalty will be payable on a country by country
basis until the last to expire of the patent or patents in such country covering
PQ-1002, and, in a country where no patent ever issued covering PQ-1002, then
until the last to expire of the patent or patents in the U.S., France, Germany
or the United Kingdom covering PQ-1002.

       6.4    REPORTS AND PAYMENTS.

       (a)    CUMULATIVE ROYALTIES. The obligation to pay Royalties under this
Article 6 shall be imposed only once (i) with respect to any sale of the same
unit of Program Product; and (ii) with respect to a single unit of Program
Product regardless of how many valid issued or, assuming they were to issue,
patent claims included in Program Patent Rights would be infringed by Third
Parties by the making, using or selling of such Program Product.

       (b)    STATEMENTS AND PAYMENTS. Guilford shall deliver to ProQuest within
sixty (60) days after the end of each calendar quarter, a statement certified by
Guilford as accurate to the best of its ability based on

                                     - 11 -

<PAGE>   12

information available to Guilford, setting forth for the previous quarter the
following information on a country-by-country basis: (i) Net Sales of Program
Products; (ii) the basis for any Royalty adjustments; and (iii) the Royalty due
hereunder, which report shall be accompanied by a remittance of the Royalty due.

       (c)    INTEREST. If Guilford fails to pay undisputed Royalty within
fifteen (15) days of the date such Royalty is due, Guilford shall pay interest
on the amount of such overdue Royalty (from the original due date) at the rate
of 10% per annum until it is paid in full. If any disputed Royalty withheld by
Guilford is later determined to have been properly owing as of the original due
date, Guilford shall likewise pay interest on the amount of such Royalty
withheld at such interest rate from the original due date until date of payment.

       (d)    TAXES. All taxes levied on account of Royalties accruing under
this Agreement shall be paid by ProQuest. If laws or regulations require
withholding of taxes from any payment by Guilford to ProQuest hereunder, the
taxes will be deducted by Guilford from remittable Royalty to ProQuest and will
be paid by Guilford to the proper taxing authority. Guilford will furnish
ProQuest with the original copies of all official receipts for such taxes. In
the event of any such withholding, the Parties agree to confer and cooperate in
good faith regarding any filings with tax authorities and other measures that
may be taken to minimize the amount of any such withholding.

       (e)    CURRENCY. All amounts payable and calculations hereunder shall be
in United States dollars, and all payments under this Article 6 shall be made to
ProQuest. As applicable, Net Sales shall be translated into United States
dollars at the rate of exchange at which United States dollars are listed in
International Financial Statistics (publisher, International Monetary Fund) or
if it is not available, The Wall Street Journal for the currency of the country
in which the sale is made at the average of the calendar quarter in which such
sales were made.

       (f)    AUDIT. Guilford shall maintain (and shall cause its Affiliates and
sublicensees to maintain) books and records as necessary to allow the accurate
calculation of Royalties due hereunder including any records required to
calculate any Royalty adjustments hereunder. Once per year ProQuest shall have
the right to engage an independent accounting firm reasonably acceptable to
Guilford, at ProQuest's expense, which shall have the right to examine in
confidence during normal business hours the relevant Guilford records in order
to determine and/or verify the amount of Royalty payments due hereunder. Should
such accountants representing ProQuest deem it necessary to examine the books
and records of any sublicensee of Guilford in connection with such an audit, the
parties agree to cooperate and to reasonably exercise Guilford's right of access
under its agreement with such sublicensee, so as to minimize any disruption in
Guilford's relations with such sublicensee. Such independent auditor will
prepare a report confirming or challenging the Royalties paid by Guilford for
any of the preceding three (3) annual periods (except any period which has
previously been subject to audit thereunder). In the event there was an
under-payment by Guilford hereunder, Guilford shall promptly make payment to
ProQuest of any short-fall (with interest specified under Section 6.4(c). In the
event that there was an over-payment by Guilford hereunder, Guilford shall
credit the excess amount against future payments. In the event any payment by
Guilford shall prove to have been incorrect by more than seven-and-a-half
percent (7.5%) to ProQuest' detriment, Guilford will reimburse ProQuest for its
reasonable fees and costs of such independent auditor.

       (g)    RECORD RETENTION. Guilford shall keep complete and accurate
records in sufficient detail to permit ProQuest to confirm the accuracy of
calculations of all payments hereunder. Such records shall be retained by
Guilford for no less than a three (3) year period following the year in which
any such payments were made hereunder, provided, however, that if there is a
good faith dispute between the parties continuing

                                     - 12 -
<PAGE>   13

at the end of any such three (3) year period with respect to such books and
records, then the time period for RPR to maintain such books and records under
dispute shall be extended until such time as the dispute is finally resolved.

       (h)    SURVIVAL. Subsections (f) and (g) of this Section 6.4 shall
survive any termination of this Agreement for the period set forth therein.

       (i)    ROYALTY ON OTHER AGREEMENT COMPOUNDS. If Guilford desires to
Develop and Commercialize any other Agreement Compound in lieu of or in addition
to PQ-1002, the Parties must first agree in writing on any royalty on Net Sales
of such Agreement Compound.

                    ARTICLE 7. CONFIDENTIALITY, PUBLICATIONS
                            AND PUBLIC ANNOUNCEMENTS

       7.1    CONFIDENTIALITY; EXCEPTIONS. Except to the extent expressly
authorized by this Agreement or otherwise agreed in writing, the Parties agree
that, for the term of this Agreement and for five (5) years thereafter (provided
that there shall not be any such limited term with respect to Confidential
Information of the other Party which is a trade secret), each Party receiving
hereunder any Confidential Information (the "Receiving Party") of the other
Party pursuant to this Agreement (the "Disclosing Party"), and ProQuest, with
respect to ProQuest Patent Rights and ProQuest Know-how that is Confidential
Information, shall keep such Confidential Information confidential and shall not
publish or otherwise disclose or use such Confidential Information for any
purpose, except to the extent that it can be established by the Receiving Party
that such Confidential Information:

              (i)    was already known to the Receiving Party, other than under
                     an obligation of confidentiality, at the time of disclosure
                     by the Disclosing Party and such Receiving Party has
                     documentary evidence to that effect;

              (ii)   was generally available to the public or otherwise part of
                     the public domain at the time of its disclosure to the
                     Receiving Party;

              (iii)  became generally available to the public or otherwise part
                     of the public domain after its disclosure or development,
                     as the case may be, other than through a breach by the
                     Receiving Party of this Section 7.1;

              (iv)   was disclosed to the Receiving Party, other than under an
                     obligation of confidentiality, by a Third Party who had no
                     obligation to the Disclosing Party not to disclose such
                     information to others; or

              (v)    was independently discovered or developed by the Receiving
                     Party without reference to any information or material
                     disclosed hereunder, and this is provable by documentary
                     evidence.

                                     - 13 -
<PAGE>   14

       7.2    AUTHORIZED DISCLOSURE AND USE.

       (a)    GUILFORD. Guilford may disclose Confidential Information of
ProQuest received from ProQuest or a Third Party to the extent such disclosure
is reasonably necessary in filing or prosecuting patent applications,
prosecuting or defending litigation, complying with applicable governmental
regulations or conducting preclinical or clinical trials, provided that if
Guilford is required by law or regulation to make any such disclosure of
ProQuest's Confidential Information, Guilford will, except where impracticable
for necessary disclosures (for example in the event of medical emergency), give
reasonable advance notice to ProQuest of such disclosure requirement and will
where applicable use its reasonable efforts to seek confidential treatment of
such Confidential Information required to be disclosed. In addition, Guilford
shall be entitled to disclose, under customary conditions of confidentiality
similar to these contained in this Article 7, Confidential Information of
ProQuest received from ProQuest, its Affiliate or a Third Party, in connection
with Guilford's performance under this Agreement to Develop and Commercialize
PQ-1002 or any other Agreement Compound, for purposes of conducting discussions
with potential licensees, investors, financial institutions, potential merger or
acquisition partners or other advisers. ProQuest understands that Guilford may
file this Agreement and related agreements as exhibits to its public filings
with the Securities and Exchange Commission. Guilford agrees to consult in good
faith with ProQuest on the nature and scope of public references to ProQuest,
its shareholders, KUCR and the University of Kansas in connection with any
filings required of Guilford by law.

       (b)    PROQUEST. ProQuest may disclose Confidential Information of
Guilford received from Guilford or a Third Party to the extent such disclosure
is reasonably necessary in prosecuting or defending litigation or (if and after
ProQuest becomes a public company) complying with applicable securities
regulations, provided that if Guilford is required by law or regulation to make
any such disclosure of Guilford's Confidential Information, ProQuest will,
except where impracticable for necessary disclosures, give reasonable advance
notice to Guilford of such disclosure requirement and will where applicable use
its reasonable efforts to seek confidential treatment of such Confidential
Information required to be disclosed. ProQuest agrees to consult in good faith
with Guilford on the nature and scope of public references to Guilford in
connection with any filings required of ProQuest by law. ProQuest may disclose
non-public (i) ProQuest Patent Rights and ProQuest Know-how in existence prior
to the Effective Date, and (ii) ProQuest Patent Rights and ProQuest Know-how
which come into existence from and after the Effective Date, so long as it does
not relate to Agreement Compounds, in each case under customary conditions of
confidentiality similar to those contained in this Article 7, for purposes of
conducting discussions with potential licensees, investors, financial
institutions, potential merger or acquisition partners or other advisers.

       7.3    TERMINATION OF PRIOR AGREEMENT. This Agreement supersedes the
Confidentiality Agreement between ProQuest and Guilford, dated January 12, 1999.
All confidential information received by a Party from the other under that
agreement shall be deemed Confidential Information received under this Agreement
by a Receiving Party from a Disclosing Party and shall be subject to the terms
of this Article 7.

       7.4    PUBLICATIONS. Except as provided in this Section 7.4, ProQuest
shall not publish or otherwise disclose non-public ProQuest Patent Rights or
ProQuest Know-how relating to PQ-1002 or other Agreement Compounds in an
academic, scientific or medical publication without Guilford's prior written
consent. Guilford shall not in any event consent without being supplied a copy
of the proposed publication or disclosure at least thirty (30) days prior to
intended submission for publication or for oral presentation. Notwithstanding
the first sentence of this Section 7.4, ProQuest may publish preclinical data
relating to PQ-1002 in existence as of the Effective Date, provided Guilford is
given at least thirty (30) days to review such manuscript or other

                                     - 14 -
<PAGE>   15

disclosure and to discuss any concerns with ProQuest, and provided further that
ProQuest may not publish the chemical structure of PQ-1002 (unless it has been
previously publicly disclosed through no fault of ProQuest). Subject to the
other terms and conditions of this Agreement, each Party will comply with
standard academic practice regarding authorship of scientific publications and
recognition of contribution of other parties in any publications relating to
Agreement Compounds.

       7.5    PUBLIC ANNOUNCEMENTS. Except as provided in this Section 7.5 and
in Section 7.4 above, ProQuest shall not make any public announcement regarding
this Agreement, ProQuest Patent Rights or ProQuest Know-how or any Agreement
Compound without Guilford's prior written consent. Guilford shall not in any
event consent without being supplied a copy of such public announcement and a
reasonable opportunity to review and comment prior to release of such public
announcement. Guilford may make any public announcements it deems necessary or
desirable under state and federal securities laws concerning this Agreement and
the Development and Commercialization of an Agreement Compound. ProQuest, if it
becomes and for so long as it remains a public company, may make any public
announcements it deems necessary or desirable under state and federal securities
laws concerning this Agreement. Subject to the foregoing two sentences and
Section 7.2 above, Guilford agrees to consult in good faith with ProQuest to
agree on the nature and scope of Guilford's public references to ProQuest, its
shareholders, KUCR, and the University of Kansas, and ProQuest agrees to consult
in good faith with Guilford to agree on the nature and scope of ProQuest's
public references to Guilford.

       7.6    SURVIVAL. Sections 7.1 and 7.2 shall survive the termination or
expiration of this Agreement for a period of five (5) years or such longer
period as is specifically contemplated therein.

               ARTICLE 8. PATENTS AND OTHER INTELLECTUAL PROPERTY

       8.1    OWNERSHIP OF PROGRAM PATENT RIGHTS. As between the Parties:

       (i)    All Program Patent Rights covering inventions conceived solely by
              ProQuest personnel (and/or Third Parties with or on ProQuest's
              behalf) pursuant to activities undertaken under this Agreement
              shall be solely owned and held by ProQuest.

       (ii)   All Program Patent Rights covering inventions conceived jointly by
              ProQuest personnel (and/or Third Parties on ProQuest's behalf) and
              Guilford personnel (and/or Third Parties on Guilford's behalf or
              pursuant to a sublicense or other collaboration arrangement with
              Guilford) whether together or jointly with Third Parties, pursuant
              to activities undertaken under this Agreement shall be jointly and
              equally owned by ProQuest and Guilford (and, where appropriate,
              such Third Party.)

       (iii)  All Program Patent Rights covering inventions conceived solely by
              Guilford personnel (and/or Third Parties with Guilford or on
              Guilford's behalf) pursuant to activities undertaken under this
              Agreement shall be solely owned and held by Guilford (and, where
              appropriate, such Third Party).

       (iv)   Each Party shall do and perform all lawful acts, including, but
              not limited to the execution of papers and lawful oaths,
              furnishing of data, test results and laboratory notebooks,
              production of relevant employees and consultants, and the giving
              of testimony, reasonably requested by

                                     - 15 -
<PAGE>   16

              the other Party to more fully perfect, affirm and record the
              ownership by the respective Parties of Program Patent Rights in
              accordance with this Section 8.1.

       8.2    PATENT PROSECUTION.

       (a)    PROQUEST. As between the Parties during the term of this
Agreement, and subject to Section 8.6 below, ProQuest (or KUCR, pursuant to the
KU License, as amended by the Consent and Agreement) shall be responsible for
and control the preparation, filing, prosecution, maintenance and defense in
opposition, reexamination, interference and similar administrative proceedings,
in the U.S. and foreign countries ("Patent Prosecution"), of ProQuest Patent
Rights in existence on the Effective Date, and any subsequent ProQuest Patent
Rights described in Section 8.1(i) above, provided that: (i) ProQuest shall
provide Guilford sufficient time before the due date and filing thereof to
review and comment on patent applications and patents and material
correspondence to and from the U.S. Patent and Trademark Office and patent
offices in foreign countries relating to such ProQuest Patent Rights; (ii)
obtain Guilford's consent (which consent shall not to be unreasonably withheld)
in connection with material actions ProQuest may take in the course of Patent
Prosecution that would limit the scope of protection for Agreement Compounds;
"Material actions" as used in this Agreement shall include: (1) the filing of
new applications (including divisionals, continuations, continuations-in-part,
reissues and reexaminations); (2) the filing of amendments; (3) the submission
of responses to Official actions on the merits (and not relating to procedure,
such as responses to restrictions or election of species); (4) the filing of
formal papers such as declarations (including Rule 131 and 132 declarations);
(5) the filing of appeal briefs and reply briefs; (6) the submission of
summaries of interviews during which the scope of claims was discussed; (7) the
filing of responses to reasons for allowances; (8) abandonment of claims; (9)
the filing of motions and taking of positions in patent interference
proceedings; and (10) other material actions which could affect the scope of
protection for Agreement Compounds; and (iii) Guilford shall have the right to
exercise ProQuest's rights under the KU License, as amended by the Consent and
Agreement, to review and comment in advance on the Patent Prosecution of
ProQuest Patent Rights made by the University of Kansas.

       (b)    EXPENSES. Guilford shall reimburse ProQuest for the reasonable
fees and costs of such Patent Prosecution (including applicable reimbursement
obligations incurred by ProQuest to KUCR under the KU License) as, when and if
ProQuest incurs such expenses (or reimbursement obligations relating to such
expenses), within thirty (30) days following presentation of an invoice and
reasonable supporting documentation, provided that: (i) for the avoidance of
doubt, Guilford shall not reimburse ProQuest for any expenses or reimbursement
obligations incurred for Patent Prosecution of patents or patent applications
that do not claim a composition of matter, use, method, process or other matter
relating to Agreement Compounds; and (ii) to the extent ProQuest licenses Third
Parties under a patent and/or patent application included in ProQuest Patent
Rights for compounds other than Agreement Compounds (for example, for prodrugs
of camptothecin in the field of cancer chemotherapeutics), Guilford will only
reimburse a pro rata share of such fees and expenses for such patent and/or
patent application, based on the number of licensees under such patent and/or
patent application included in ProQuest Patent Rights.

       (c)    GUILFORD. Guilford shall at its cost be responsible for and
control the Patent Prosecution of Program Patent Rights described in Section
8.1(ii) and (iii) above, and such other ProQuest Patent Rights as the Parties
may otherwise agree in writing. In any such Patent Prosecution of Program Patent
Rights described in Section 8.1(ii) above, Guilford shall provide ProQuest
sufficient opportunity to review and consult in advance of any deadlines and any
filings by Guilford of patent applications and patents and material
correspondence to and from the U.S. Patent and Trademark Office and patent
offices in foreign countries

                                     - 16 -
<PAGE>   17

relating to such Program Patent Rights. In the event Guilford elects not pursue
the Patent Prosecution within its control of any ProQuest Patent Rights,
Guilford shall give ProQuest sufficient notice to afford ProQuest the
opportunity to do so at ProQuest's cost, in which event, ProQuest will own such
ProQuest Patent Rights, free and clear of any license to Guilford under this
Agreement.

       (d)    ProQuest agrees to use commercially reasonable efforts, in
consultation with Guilford, to diligently conduct Patent Prosecution of ProQuest
Patent Rights in a manner so as to preserve and expand the scope of claims
therefor to the extent reasonably possible.

       (e)    In the event that ProQuest elects not to pursue Patent Prosecution
of any ProQuest Patent Rights, ProQuest shall give Guilford sufficient notice to
afford Guilford the opportunity to do so at Guilford's cost, in which event
Guilford will own such ProQuest Patent Rights, free and clear of any ownership
interest of ProQuest in said ProQuest Patent Rights. ProQuest will execute all
documents and do all things as Guilford may reasonably request in connection
with the exercise of Guilford's rights under this Section.

       8.3    ENFORCEMENT OF PATENT RIGHTS.

       (a)    GUILFORD. Guilford shall have the right but not the obligation, in
its own name, to enforce Program Patent Rights against any Third Party suspected
of infringing a claim of Program Patent Rights, subject, to the extent
applicable, to the terms of Article 8 of the KU License, as amended by the
Consent and Agreement. Guilford shall have exclusive control over the conduct of
any such proceedings, including the right to settle or compromise such
proceedings, subject, to the extent applicable, to the terms of Article 8 of the
KU License, as amended by the Consent and Agreement. Subject to Guilford's right
to be reimbursed out of any award or recovery under Section 8.3(b) below, the
expense of any proceeding Guilford initiates, including lawyers' fees and costs,
shall be borne by Guilford. ProQuest agrees to cooperate (at Guilford's expense
for ProQuest's out-of-pocket expenses) with Guilford in such action as Guilford
may reasonably request.

       (b)    DISPOSITION OF ANY AWARD OR RECOVERY. Any award or recovery paid
to Guilford by a Third Party as a result of such patent infringement proceedings
(whether by way of settlement or otherwise) shall: (i) first be applied toward
reimbursement of legal fees, costs and expenses incurred by the Parties in
proportion to their out-of-pocket expenditures of such fees, costs and expenses;
and (ii) second, from the remainder, if any, Guilford shall pay to ProQuest an
amount equal to the applicable Royalty rate as applied to the remainder as
though such remainder were Net Sales of Program Products in the year in which
the award or recovery is received.

       (c)    PROQUEST. ProQuest shall by its own counsel and at its own expense
have the right to participate and be represented in any such proceeding that
Guilford initiates regarding ProQuest Patent Rights described in Section 8.3(a)
above. In the event that Guilford does not initiate an action to enforce Program
Patent Rights against a Third Party suspected of infringing a claim of ProQuest
Patent Rights, ProQuest may give notice to Guilford that ProQuest intends to
bring such enforcement action at ProQuest's own expense. In such event, the
Parties shall confer, and if Guilford has a commercially reasonable basis for
foregoing or delaying such infringement proceeding, then Guilford's decision
shall govern, provided, however, in determining whether there is a commercially
reasonable basis for Guilford's decision, any interest (direct or indirect) held
by Guilford in the suspected infringer shall be disregarded. Any recovery made
by ProQuest from a Third Party pursuant to any infringement action ProQuest
brings as contemplated in this Section 8.3(c) will be allocated as if it were
recovered by Guilford under Section 8.3(b) above and the Consent and Agreement.

       8.4    INFRINGEMENT DEFENSE. Guilford shall defend and control any suit
against any of Guilford, Guilford's Affiliates or sublicensees, ProQuest and/or
ProQuest's Affiliates alleging infringement of any patent or other intellectual
property right of a Third Party arising out of the manufacture, use, sale, offer
to sell or

                                     - 17 -
<PAGE>   18

importation of a Program Product by Guilford, Guilford's Affiliates or
sublicensees. Guilford shall be responsible for all costs, expenses and damages,
including lawyer's fees and costs, associated with any such suit or action, and
shall indemnify ProQuest against any losses, claims or damages ProQuest may
suffer or incur as a result of such infringement defense, provided that (i)
Guilford shall be entitled to a 50% credit (with excess credit carrying over to
future payment obligations) toward any Milestone Payments (whether for stock of
ProQuest under the Stock Purchase Agreement or otherwise) or Royalty under
Article 5 or 6 above for all such costs, expenses, damages and indemnity
reimbursement obligations actually paid by Guilford; (ii) for any item of cost,
expense, damage or reimbursement paid by Guilford, the credit described in
clause (i) shall only apply to Milestone Payments or Royalties that become due
after Guilford pays such item; and (iii) for the avoidance of doubt, any
prospective royalty obligation mandated by any settlement, judgment or award
will be treated as Third Party Royalty under Section 6.2 above.

       8.5    COOPERATION AMONG THE PARTIES. Subject, to the extent applicable,
to the terms of the KU License, as amended by the Consent and Agreement: (i)
neither Party shall admit the invalidity or unpatentability of any ProQuest
Patent Rights or take any other action that may diminish the scope of protection
for Agreement Compounds without the other Party's prior written consent (such
consent not to be unreasonably withheld) in any action taken in the prosecution
of, or in the defense of an action by a Third Party alleging patent invalidity
or unpatentability of any patent application or patent included among the
ProQuest Patent Rights; (ii) with respect to Patent Prosecution conducted by
Guilford of ProQuest Patent Rights, Guilford shall provide ProQuest sufficient
time before the due date and filing thereof, to review and comment on patent
applications and patents and material correspondence to and from the U.S. Patent
and Trademark Office and foreign patent offices; (iii) the Parties agree to
cooperate with each other and to use best efforts to ensure the cooperation of
any of their respective personnel and licensee(s) or licensor(s) as might
reasonably be requested in any such matters, and shall sign any necessary legal
papers and provide the prosecuting party with useful data or other information;
(iv) the Parties will confer on what action to take with respect to the defense
of infringement proceedings naming both Guilford and ProQuest or in proceedings
to enforce patents claiming the ProQuest Patent Rights against a Third Party;
(v) except to the extent Patent Prosecution rights are granted to ProQuest in
Section 8.2(a) above, if the Parties cannot agree on the course of action to be
taken in the Patent Prosecution of any Program Patent Rights or in the defense
of any Third Party infringement action, Guilford's decisions shall control; and
(vi) each Party agrees to bring to the attention of the other Party any patent
or patent application it discovers, or has discovered, and which relates to the
subject matter of this Agreement.

       8.6    FOREIGN FILINGS. The Parties shall consult with each other
concerning the scope of filings of ProQuest Patent Rights, and ProQuest shall
cause ProQuest Patent Rights it is prosecuting under Section 8.2 above to be
filed in those countries designated by Guilford, provided that each Party shall
use Commercially Reasonable Efforts to cause ProQuest Patent Rights to be filed
at least in the United States, Europe, Canada and Japan. In the event ProQuest
elects to file ProQuest Patent Rights in countries other than those designated
by Guilford, then Guilford shall be relieved of its reimbursement obligations
under Section 8.2(b) above for such ProQuest Patent Rights in such countries;
and ProQuest shall own such ProQuest Patent Rights free and clear of any license
to Guilford under this Agreement. Guilford shall have the final discretion with
respect to the ultimate geographic scope of filing of Guilford Patent Rights.

       8.7    PATENT ASSIGNMENT. ProQuest will not assign its rights under any
jointly owned Program Patent Rights except with the prior written consent of
Guilford, provided that ProQuest may assign such rights without consent to an
Affiliate or other permitted assignee under this Agreement in connection with a
merger or similar reorganization or the sale of all or substantially all of its
assets, as provided in Section 13.1 below.

       8.8    NO WARRANTY RESPECTING PATENTS. No Party makes any warranty with
respect to the validity, perfection or dominance of any Patent or other
proprietary right or with respect to the absence of right in Third Parties which
may be infringed by the manufacture, sale or other use of any Program Product.

                                     - 18 -
<PAGE>   19

                    ARTICLE 9. REPRESENTATIONS AND WARRANTIES

       9.1    REPRESENTATIONS AND WARRANTIES OF PROQUEST. Except as set forth on
the Disclosure Schedule attached hereto as Schedule 4 and made a part of this
Agreement, ProQuest hereby represents and warrants to Guilford as follows:

       (a)    ORGANIZATION AND STANDING. ProQuest is a corporation duly
organized, validly existing and in good standing under the laws of the state of
its organization and has the full corporate power and authority to carry on its
business as currently conducted, to enter into this Agreement and each of the
agreements contemplated hereby (collectively, the "Transaction Documents") and
to carry out the transactions contemplated thereby.

       (b)    AUTHORIZATION; NO CONFLICTS. The execution, delivery and
performance by ProQuest of each of the Transaction Documents have been duly
authorized (which authorization has not been modified or rescinded and is in
full force and effect), and will not: (a) conflict with, or violate any term or
provision of ProQuest's organizational documents; or (b) conflict with, or
result in any material breach of, or constitute a material default under, any
agreement to which ProQuest or its assets is or are a party or by which ProQuest
is bound, or any applicable law or regulation. No other corporate action is
necessary for ProQuest to enter into each of the Transaction Documents and to
consummate the transactions contemplated thereby.

       (c)    BINDING OBLIGATION. This Agreement constitutes a valid and binding
obligation of ProQuest, enforceable in accordance with its terms; and each of
the Transaction Documents to be executed by ProQuest pursuant hereto, when
executed and delivered in accordance with the provisions hereof, shall be a
valid and binding obligation of ProQuest, enforceable in accordance with its
terms except as enforceability may be limited or affected by bankruptcy,
insolvency, reorganization, moratorium, fraudulent conveyance and other similar
laws and equitable principles now or hereafter in effect and affecting the
rights and remedies of creditors generally.

       (d)    PATENT RIGHTS. Except for the rights reserved to the University of
Kansas or KUCR under the KU License, ProQuest owns or Controls all of the
ProQuest Patent Rights set forth on Schedule 2, which constitutes a true and
complete list of all ProQuest Patent Rights in existence on the Effective Date
that relate to PQ-1002 or any other Agreement Compound. ProQuest is not aware of
any action, suit, inquiry, investigation or other fact (other than as may be
disclosed in filings or correspondence with the U.S. Patent and Trademark
Office, which materials have been made available to Guilford) which ProQuest
believes may question or threaten the validity or priority of any ProQuest
Patent Rights or Guilford's or ProQuest's ability to perform under this
Agreement.

       (e)    PROQUEST KNOW-HOW. To ProQuest's knowledge, ProQuest has disclosed
or made available to Guilford all ProQuest Know-how in ProQuest's possession or
Control which may adversely affect the scientific, regulatory or business
prospects of the Development and Commercialization of PQ-1002 or any other
Agreement Compound.

       (f)    INFUSION STUDY. Without limiting the generality of any of the
other representations and warranties contained in this Section 9.1, ProQuest
possesses no information which has led it to believe that the Infusion Study may
result in the generation of data adverse to the prospects of Guilford's
successful Development and Commercialization of PQ-1002 or any other Agreement
Compound.

                                     - 19 -
<PAGE>   20

       (g)    DISCLOSURE. To ProQuest's knowledge, no representation or warranty
by ProQuest in this Agreement, and no ProQuest Know-how furnished to Guilford in
contemplation of this Agreement, or in connection with the transactions
contemplated hereby, contains any untrue or misleading statement or omits any
fact necessary to make the statements contained herein or therein, in light of
the circumstances under which made, not misleading as of the Effective Date.

       9.2    REPRESENTATIONS AND WARRANTIES OF GUILFORD. Guilford hereby
represents and warrants to ProQuest as follows:

       (a)    ORGANIZATION AND STANDING. Guilford is a corporation duly
organized, validly existing and in good standing under the laws of the state of
its organization and has the full corporate power and authority to carry on its
business as currently conducted, to enter into each of the Transaction Documents
and to carry out the transactions contemplated thereby.

       (b)    AUTHORIZATION; NO CONFLICTS. The execution, delivery and
performance by Guilford of each of the Transaction Documents have been duly
authorized (which authorization has not been modified or rescinded and is in
full force and effect), and will not: (a) conflict with, or violate any term or
provision of Guilford's organizational documents; or (b) conflict with, or
result in any material breach of, or constitute a material default under, any
agreement to which Guilford or its assets is or are a party or by which Guilford
is bound, or any applicable law or regulation. No other corporate action is
necessary for Guilford to enter into each of the Transaction Documents and to
consummate the transactions contemplated thereby.

       (c)    BINDING OBLIGATION. This Agreement constitutes a valid and binding
obligation of Guilford, enforceable in accordance with its terms; and each of
the Transaction Documents to be executed by Guilford pursuant hereto, when
executed and delivered in accordance with the provisions hereof, shall be a
valid and binding obligation of Guilford, enforceable in accordance with its
terms except as enforceability may be limited or affected by bankruptcy,
insolvency, reorganization, moratorium, fraudulent conveyance and other similar
laws and equitable principles now or hereafter in effect and affecting the
rights and remedies of creditors generally.

       9.3    PERFORMANCE BY AFFILIATES. The Parties recognize that each may
perform some or all of its obligations under this Agreement through Affiliates;
provided, however, that each Party shall remain responsible for and be guarantor
of the performance by its Affiliates of such obligations under this Agreement,
and shall cause its Affiliates to comply with the provisions of this Agreement
in connection with such performance, including without limitation those
provisions which specifically survive any termination of this Agreement.

       9.4    DISCLAIMER OF WARRANTY. EXCEPT AS SET FORTH IN THIS ARTICLE 9,
EACH PARTY AS TO THE OTHER PARTY EXPRESSLY DISCLAIMS ALL REPRESENTATIONS AND
WARRANTIES, EXPRESS OR IMPLIED, IN CONNECTION WITH ITS PROGRAM PATENT RIGHTS AND
KNOW-HOW, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. ANY
AGREEMENT COMPOUND OR MATERIAL PROVIDED HEREUNDER, INCLUDING, WITHOUT
LIMITATION, ALL KNOW-HOW, ARE PROVIDED "AS IS" AND "WITH ALL FAULTS."

                                     - 20 -
<PAGE>   21

                        ARTICLE 10. TERM AND TERMINATION

       10.1   TERM. This Agreement shall commence as of the Effective Date and,
unless sooner terminated as provided herein, shall continue in effect until the
latest of (a) the date on which Guilford ceases to be engaged in the Development
or Commercialization of an Agreement Compound pursuant to this Agreement and so
notifies ProQuest in writing or (b) the expiration of the last to expire of the
Program Patent Rights.

       10.2   TERMINATION BY GUILFORD. This Agreement may be terminated by
Guilford as provided below:

       (a)    At any time during the term of this Agreement if ProQuest
materially breaches this Agreement, which breach is not cured within sixty (60)
days of written notice thereof from Guilford.

       (b)    At any time during the term of this Agreement upon written notice
if ProQuest becomes and remains subject to a Bankruptcy Event.

       (c)    If Guilford elects to terminate this Agreement in its sole and
absolute discretion based on the results of the Infusion Study, by giving
written notice to ProQuest to such effect on or before the Determination Date.

       (d)    At any time during the term of this Agreement upon written notice
given by Guilford at least 60 days prior to the effective date of such
termination.

       In the event Guilford terminates this Agreement pursuant to any of
Section 10.2(a) through (d) above, subject to Section 10.4, Guilford shall be
released from all prospective obligations under this Agreement, except for those
items that are expressly provided to survive termination.

       10.3   TERMINATION BY PROQUEST. This Agreement may be terminated by
ProQuest in whole or in part as provided below:

       (a)    At any time during the term of this Agreement if Guilford
materially breaches this Agreement, which breach is not cured within sixty (60)
days of written notice thereof from ProQuest.

       (b)    At any time during the term of this Agreement upon written notice
if Guilford becomes and remains subject to a Bankruptcy Event.

       (c)    Subject to Section 13.5, if Guilford has not, directly or through
a partner, commenced the first human clinical trial (whether under an IND or
otherwise) of PQ-1002 on or before 18 months following the Determination Date.

       (d)    Subject to Section 13.5, if Guilford has not, directly or through
a partner, filed the first NDA for PQ-1002 no later than the fifth anniversary
of the Determination Date.

       The Parties agree that (c) and (d) above shall not apply in the event
Guilford has decided to Develop and Commercialize an Agreement Compound other
than PQ-1002; provided, however, that if Guilford makes

                                     - 21 -
<PAGE>   22

such a decision, the Parties shall negotiate in good faith to replace (c) and
(d) with applicable provisions related to the new Agreement Compound.

       In the event ProQuest terminates this Agreement pursuant to any of
Sections 10.3 (a) thru (d) above, subject to Section 10.4, ProQuest shall be
released from all prospective obligations, except for those obligations that are
expressly provided to survive termination.

       10.4   ALLOCATION OF RIGHTS UPON TERMINATION. In the event of termination
of this Agreement for any reason, unless otherwise agreed in writing, the
Parties shall have the rights and obligations set forth in this Section 10.4:

       (a)    PROQUEST PATENT RIGHTS AND PROQUEST KNOW-HOW. Subject to Section
10.4(d) below, and except as otherwise specifically provided in this Agreement,
Guilford shall have no further or additional right and license to use the
ProQuest Patent Rights, ProQuest Know-how or Confidential Information of
ProQuest. Notwithstanding the foregoing, Guilford shall have a limited right and
license to use such ProQuest Patent Rights, Pro-Quest Know-how or Confidential
Information solely to complete any Regulatory Filings required by law, to make
any disclosures required by law, including state and federal securities laws,
and in connection with the marketing, distribution and sale of all of its
inventory of the Program Products existing as of the date of termination of this
Agreement for a six (6) month period following such date of termination.

       (b)    TRANSFER OF CERTAIN INFORMATION. Subject to Section 10.4(d) below,
Guilford shall within 60 days following any such termination transfer to
ProQuest all preclinical and clinical data and copies of all Regulatory Filings
and Regulatory Approvals in Guilford's possession relating to Agreement
Compounds.

       (c)    GUILFORD PATENT RIGHTS AND GUILFORD KNOW-HOW. Subject to Section
10.4(d) below, Guilford shall grant ProQuest a permanent, royalty-free,
non-exclusive worldwide license (with a right to sublicense) under Guilford
Patent Rights and Guilford Know-how: (i) to Develop and Commercialize any
Agreement Compound; and (ii) to utilize any process relating to the manufacture
of prodrugs covered by Guilford Patent Rights or Guilford Know-how, provided
that nothing herein shall be deemed to be a license by Guilford to ProQuest of
any other Patent Rights of Guilford. In such case, Guilford shall within 60 days
following any such termination disclose or make available to ProQuest Guilford
Know-how in Guilford's Control as of such termination necessary to utilize any
such process contemplated in (ii) above. Notwithstanding Section 7.1, ProQuest
may then disclose non-public Guilford Patent Rights or Guilford Know-how
contemplated in the preceding sentence under customary conditions of
confidentiality similar to those contained in Article 7 for purposes of
conducting discussions with potential licensees, investors, financial
institutions, merger or acquisition partners or other advisers.

       (d)    TERMINATION DUE TO PROQUEST'S BREACH. In the event this Agreement
is terminated by Guilford pursuant to Section 10.2(a), the provisions of Section
10.4(a) through (c) shall not apply, and Section 10.4(e) shall apply to
ProQuest, but not to Guilford, and without limiting any other remedies Guilford
may have against ProQuest, Guilford shall have a permanent, exclusive worldwide
license under ProQuest Patent Rights and ProQuest Know-how to Develop and
Commercialize any Agreement Compound then in Development or Commercialization,
subject to Guilford making the payments to ProQuest in the amounts and at the
times provided in Articles 5 and 6.

       (e)    RETURN OR DESTRUCTION. Subject to Section 10.4(d) above, each
Receiving Party shall promptly return to the Disclosing Party or destroy all
tangible embodiments of Confidential Information received from the Disclosing
Party, and all tangible embodiments of Program Patent Rights and Know-how, and
all copies thereof, received from the Disclosing Party. At the Disclosing
Party's request, the Receiving Party will certify its compliance with this
Section 10.4(b) in writing to the Disclosing Party.

                                     - 22 -
<PAGE>   23

       (f)    ACCRUED RIGHTS, SURVIVING OBLIGATIONS. Unless explicitly provided
otherwise in this Agreement, termination, relinquishment or expiration of the
Agreement for any reason shall be without prejudice to any rights which shall
have accrued to the benefit to either Party prior to such termination,
relinquishment or expiration, including damages arising from any breach under
this Agreement. Such termination, relinquishment or expiration shall not relieve
any Party from obligations which are expressly indicated to survive termination
or expiration of the Agreement.

       (g)    SUBLICENSEE RIGHTS. In the event that this Agreement and/or the
rights and licenses granted under this Agreement to Guilford are terminated, any
sublicense granted under this Agreement shall remain in full force and effect as
a direct license between ProQuest and the sublicensee under the terms and
conditions of the sublicense agreement, subject to sublicensee (i) curing any
breach by Guilford, if such termination was due to a breach by Guilford, and
(ii) agreeing in writing to be bound to ProQuest under such terms and conditions
as well as those related to indemnification and confidentiality contained in
Articles 7 and 11 hereof within thirty (30) days after ProQuest provides written
notice to sublicensee of the termination of Guilford's rights and licenses under
this Agreement, provided that the financial terms are no less favorable to
ProQuest, and ProQuest's obligations under such sublicense are no greater, than
currently existing under this Agreement. At the request of Guilford, ProQuest
will acknowledge to a sublicensee, ProQuest's obligations to sublicensee under
this Section 10.4(f).

                           ARTICLE 11. INDEMNIFICATION

       11.1   INDEMNIFICATION BY GUILFORD. Guilford will defend and indemnify
ProQuest, its officers, directors, employees, and agents and hold them harmless
from all liability, loss, damage and cost arising out of (i) any claims of any
nature (excluding claims by Third Parties relating to patent infringement,
except to the extent and subject to the terms specifically set forth in Section
8.4 above) arising out of the research, Development or Commercialization of any
Agreement Compound (or any Program Product or any other product that contains an
Agreement Compound) by, on behalf of or under the authority of Guilford, or (ii)
any breach of Guilford's representations or warranties under this Agreement.

       11.2   INDEMNIFICATION BY PROQUEST. ProQuest will indemnify Guilford, its
officers, directors, employees, agents, and licensees and hold them harmless
from all liability, loss, damage and cost arising out of any breach of
ProQuest's representations or warranties under this Agreement.

       11.3   PROCEDURE. In the event it becomes aware of a claim for which
indemnification may be sought under this Article 11, the indemnified Party shall
promptly notify the other in writing of the claim. In case any proceeding
(including any governmental investigation) shall be instituted involving any
Party in respect of which indemnity may be sought pursuant to this Article 11,
such Party (the "Indemnified Party") shall promptly notify the other Party (the
"Indemnifying Party") in writing and the Indemnifying Party and Indemnified
Party shall meet to discuss how to respond to any claims that are the subject
matter of such proceeding. The Indemnifying Party, upon request of the
Indemnified Party, shall retain counsel reasonably satisfactory to the
Indemnified Party to represent the Indemnified Party and shall pay the fees and
expenses of such counsel related to such proceeding. In any such proceeding, the
Indemnified Party shall have the right to retain its own counsel, but the fees
and expenses of such counsel shall be at the expense of the Indemnified Party
unless (i) the Indemnifying Party and the Indemnified Party shall have mutually
agreed to the retention of such counsel or (ii) the named parties to any such
proceeding (including any impleaded parties) include both the Indemnifying Party
and the Indemnified Party and representation of both parties by the same counsel
would

                                     - 23 -
<PAGE>   24

be inappropriate due to actual or potential differing interests between them.
All such fees and expenses shall be reimbursed as they are incurred. The
Indemnifying Party shall not be liable for any settlement of any proceeding
effected without its written consent, but if settled with such consent or if
there be a final judgment for the plaintiff, the Indemnifying Party agrees to
indemnify the Indemnified Party from and against any loss or liability by reason
of such settlement or judgment. The Indemnifying Party shall not, without the
written consent of the Indemnified Party, effect any settlement of any pending
or threatened proceeding in respect of which the Indemnified Party is, or
arising out of the same set of facts could have been, a party and indemnity
could have been sought hereunder by the Indemnified Party, unless such
settlement includes an unconditional release of the Indemnified Party from all
liability on claims that are the subject matter of such proceeding.

       11.4   SURVIVAL. The provisions of this Article 11 shall survive any
termination of this Agreement.

                         ARTICLE 12. DISPUTE RESOLUTION

       12.1   GENERAL. The Parties desire to establish the procedures in this
Article 12 to facilitate the resolution of any dispute pertaining to the rights
and obligations of the Parties under this Agreement in an expedient and
commercially reasonable manner by mutual cooperation and without resort to
litigation. Except as otherwise provided in this Agreement or agreed by the
Parties in writing, all disputes under this Agreement will be resolved as set
forth in this Article 12.

       12.2   INITIAL ATTEMPTS TO RESOLVE DISPUTES.

       (a)    Any disputes between the Parties will first be addressed either
informally between the Parties or raised in the forum of the Governance
Committee. If the matter is sufficiently urgent, either Party may request a
special meeting of the Governance Committee, in which event the Parties will use
Commercially Reasonable Efforts to convene such a special meeting at a time and
place that is mutually convenient to the Parties. If the Parties are unable to
resolve a dispute among them informally or in the Governance Committee, or the
Governance Committee could not be convened to consider the matter, during a
period of thirty (30) days following the giving of formal written notice by one
Party to the other specifically invoking the dispute resolution procedure
contained in this Article 12, then either Party may, by written notice to the
other, have such dispute referred to their respective executive officers
designated below or their successors, for attempted resolution by good faith
negotiations:

       FOR GUILFORD:     Chief Executive Officer of Guilford

       FOR PROQUEST:     Chief Executive Officer of ProQuest

In the event the designated executive officers are not able to resolve any such
dispute within thirty (30) days after written notice given by one Party to the
other invoking this stage in the dispute resolution procedure under this Article
12, either Party may by written notice to the other commence the Arbitration
process set forth in Section 12.3 below.

       (b)    All negotiations pursuant to this Section 12.2 shall be treated as
compromise and settlement negotiations. Nothing said or disclosed, nor any
document produced, in the course of such negotiations which is not otherwise
independently discoverable shall be offered or received as evidence or used for
impeachment or for any other purpose in any current or future arbitration or
litigation.

       12.3   ARBITRATION. If a dispute has not been resolved by negotiation as
provided in Section 12.2 above, then, except as otherwise provided in this
Section 12.3, the dispute shall be determined by arbitration

                                     - 24 -
<PAGE>   25

in Chicago, Illinois in accordance with the Commercial Arbitration Rules of the
AAA, by three (3) arbitrators each of whom (i) has the qualifications and
experience set forth in subsection (a) of this Section 12.3 and (ii) is selected
as provided in subsection (b) of this Section 12.3. Any issue as to whether or
the extent to which the dispute is subject to the arbitration and other dispute
resolution provisions contained in this Agreement, including, but not limited
to, issues relating to the validity or enforceability of these arbitration
provisions, the applicability of any statute of limitations or other defense
relating to the timeliness of the assertion of any claim or any other matter
relating to the arbitrability of such claim, shall be decided by the
arbitrators; provided, however, that any person or entity who or which has not
agreed to be bound by the provisions of this Agreement or these arbitration
provisions shall not be bound by any arbitration award rendered by the
arbitrators unless such person or entity participates in the arbitration
proceeding and does not object to being bound by such award at or prior to the
commencement of the arbitration hearing. The arbitrators shall base their award
on the terms of this Agreement, and they shall endeavor to follow the law and
judicial precedents which a U.S. District Judge sitting in the Southern District
of New York would apply in the event the dispute were litigated in such court;
provided, however, that nothing contained herein shall be deemed to enlarge the
grounds for vacating arbitral awards even if, despite such endeavors, the
arbitrators fail to correctly follow applicable law. The arbitrators shall
render their award in writing and, unless all Parties agree otherwise, shall
include an explanation in reasonable detail of the reasons for their award. The
arbitration shall be governed by the substantive laws of the State of New York
and applicable to contracts made and to be performed therein, without regard to
conflicts of law rules, and by the arbitration law of the Federal Arbitration
Act (Title 9, U.S. Code), and judgment upon the award rendered by the
arbitrators may be entered in any court having jurisdiction thereof. The Parties
expressly waive any putative right they may otherwise have to seek an award of
punitive damages arising out of any dispute hereunder.

       (a)    QUALIFICATIONS. Each person named on any list of potential
arbitrators shall be either (i) a neutral and impartial lawyer with excellent
academic and professional credentials (x) who is or has been practicing law at
least fifteen (15) years, specializing in either general commercial litigation
or general corporate and commercial matters (or, if the dispute involves patent
matters, such as whether a product Developed and Commercialized by Guilford is
an Agreement Compound or a Program Product, then in patent law or litigation or
judging relating to patents), with experience in the field of the
pharmaceutical/biotechnology industry and (y) who has had both training and
experience as an arbitrator and is generally available to serve as an
arbitrator, or (ii) an impartial and neutral retired U.S. federal court judge or
an impartial and neutral retired judge from the highest state court who (x)
served as a judge for at least ten (10) years and (y) has had both training and
experience as an arbitrator and is generally available to serve as an
arbitrator.

       (b)    SELECTION. Each arbitrator shall be selected as provided in this
Section 12.3 and otherwise in accordance with the AAA's Commercial Arbitration
Rules in effect on the Effective Date.

       12.4   EXPENSES. All expenses and fees of the arbitrators and expenses
for hearing facilities and other expenses of the arbitration shall be borne
equally by Guilford and ProQuest unless the Parties agree otherwise or unless
the arbitrators in the award assess such expenses against one of the Parties or
allocate such expenses other than equally between Guilford and ProQuest. Each of
the Parties shall bear its own counsel fees and the expenses of its witnesses
except (i) to the extent otherwise provided in this Agreement or by applicable
law or (ii) to the extent the arbitrators in their discretion determine for any
reason to allocate such fees and expenses among the Parties in a different
manner. Any attorney or retired judge who serves as an arbitrator shall be
compensated at a rate equal to his or her current regular hourly billing rate
unless otherwise mutually agreed upon by the Parties and the arbitrator.

                                     - 25 -
<PAGE>   26

       12.5   CERTAIN TERMS. For purposes of this Article 12, the term
"impartial" shall mean any person who is not nor has been within the previous
five (5) years an employee or paid consultant of a Party, and does not have any
other extended familial, close social, material ownership or other relationship
to a Party.

       12.6   ARBITRATION CONFIDENTIALITY. All aspects of an arbitration
conducted pursuant to this Agreement shall be and remain confidential and all
participants shall be bound by judicially enforceable obligations of strict
confidentiality except to the extent (i) required by law, including, without
limitation, material disclosure requirements under applicable securities laws,
or (ii) the Parties agree in writing to waive in whole or part such
confidentiality.

       12.7   SURVIVAL. Any duty to arbitrate under this Agreement shall survive
and remain in effect and enforceable after termination of this Agreement for any
reason.

                            ARTICLE 13. MISCELLANEOUS

       13.1   ASSIGNMENT. Neither this Agreement nor any interest hereunder
shall be assignable by either Party without the prior written consent of the
other Party, except for assignment by operation of law in connection with a
merger of a Party with or into another Person (whether or not such Party is the
surviving and controlling entity) or the sale or other transfer of all of the
shares or all or substantially of the assets of a Party to another direct or
indirect wholly-owned subsidiary of that Party. This Agreement shall be binding
upon the successors and permitted assigns of the Parties and the name of a Party
appearing herein shall be deemed to include the names of such Party's successors
and permitted assigns to the extent necessary to carry out the intent of this
Agreement. Any assignment not in accordance with this Section 13.1 shall be
void.

       13.2   AFFILIATED ENTITIES. Either Party may assign any of its rights or
obligations under this Agreement in any country to any Affiliates; provided that
such assignment shall not relieve the assigning Party of its responsibilities
for performance of its obligations under this Agreement.

       13.3   RESEARCH AND DEVELOPMENT ENTITIES. Either Party may assign its
rights and obligations under this Agreement to an entity or entities (e.g.,
partnership or corporation) that are specifically formed for financial purposes
and that finance research and development performed by such Party; provided that
such assignment shall not relieve the assigning Party of responsibility for
performance of its obligations under this Agreement.

       13.4   FURTHER ACTIONS. Each Party agrees to execute, acknowledge and
deliver such further instruments, and to do all such other acts, as may be
necessary or appropriate in order to carry out the purposes and intent of the
Agreement.

       13.5   FORCE MAJEURE. No Party shall be liable to any other Party for
loss or damages or shall have any right to terminate this Agreement for any
default or delay attributable to any Force Majeure, if the Party affected shall
give prompt notice of any such cause to the other Parties. The Party giving such
notice shall thereupon be excused from such of its obligations hereunder as it
is thereby disabled from performing for so long as it is so disabled, provided,
however, that such affected Party commences and continues to take reasonable and
diligent actions to cure such cause.

                                     - 26 -
<PAGE>   27

       13.6   NOTICES. All notices and other communications hereunder shall be
in writing and shall be deemed given if delivered personally or by facsimile
transmission (receipt verified), mailed by registered or certified mail (return
receipt requested), postage prepaid, or sent by express courier service, to the
parties at the following addresses (or at such other address for a Party as
shall be specified by like notice, provided, however, that notices of a change
of address shall be effective only upon receipt thereof):

       If to ProQuest, addressed to:           ProQuest Pharmaceuticals Inc.
                                               1617 St. Andrews Drive
                                               Lawrence, Kansas 66047
                                               Attention:  President
                                               Telecopier:    (785) 832-8234

       with a copy (which shall        Shook, Hardy & Bacon LLP
       not constitute notice) to:      1010 Grand Blvd., 5th Floor
                                               P.O. Box 15607
                                               Kansas City, Missouri 64106-0607
                                               Attention: John W. Simpson
                                               Telecopier:  (816) 842-3190

       If to Guilford, addressed to:           Guilford Pharmaceuticals Inc.
                                               6611 Tributary Street
                                               Baltimore, MD 21224
                                               Attention:  Secretary
                                               Telecopier:    (410) 631-6819

       with a copy (which shall        Hogan & Hartson LLP
       not constitute notice) to:      111 S. Calvert Street
                                               Suite 1600
                                               Baltimore, Maryland 21202
                                               Attention: Michael J. Silver
                                               Telecopier:  (410) 539-6981

       13.7   AMENDMENT. No amendment, modification or supplement of any
provision of this Agreement shall be valid or effective unless made in writing
and signed by a duly authorized officer of each Party.

       13.8   WAIVER. No provision of the Agreement shall be waived by any act,
omission or knowledge of any Party or its agents or employees except by an
instrument in writing expressly waiving such provision and signed by a duly
authorized officer of the waiving Party.

       13.9   COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which need not contain the signature of more than one
Party but all such counterparts taken together shall constitute one and the same
agreement.

       13.10  DESCRIPTIVE HEADINGS. The descriptive headings of this Agreement
are for convenience only, and shall be of no force or effect in construing or
interpreting any of the provisions of this Agreement.

                                     - 27 -
<PAGE>   28

       13.11  GOVERNING LAW; JURISDICTION. For the purposes of this Agreement,
the Parties acknowledge their diversity (ProQuest being a Kansas corporation
having its principal place of business in Kansas and Guilford being a Delaware
corporation having its principal place of business in Maryland) and agree that
this Agreement shall be governed by and interpreted in accordance with the
substantive laws of the State of New York (without regard to conflict of law
principles) and federal patent law, and the Parties hereby accept and submit to
the exclusive jurisdiction of the Federal District Court located in Kansas or
the state courts of general jurisdiction in the state of Kansas for purposes of
enforcing any this Agreement including any arbitral award hereunder.

       13.12  SEVERABILITY. In the event that any clause or portion thereof in
this Agreement is for any reason held to be invalid, illegal or unenforceable,
the same shall not affect any other portion of this Agreement, as it is the
intent of the Parties that this Agreement shall be construed in such fashion as
to maintain its existence, validity and enforceability to the greatest extent
possible. In any such event, this Agreement shall be construed as if such clause
of portion thereof had never been contained in this Agreement, and there shall
be deemed substituted therefor such provision as will most nearly carry out the
intent of the Parties as expressed in this Agreement to the fullest extent
permitted by applicable law unless doing so would have the effect of materially
altering the right and obligations of the Parties in which event this Agreement
shall terminate and all the rights and obligations granted to the Parties
hereunder shall cease and be of no further force and effect.

       13.13  ENTIRE AGREEMENT OF THE PARTIES. This Agreement, the Stock
Purchase Agreement, the Escrow Agreement and the Consent and Agreement,
including all Appendices attached hereto and thereto, set forth all the
covenants, promises, agreements, warranties, representations, conditions and
understandings between the Parties hereto and supersede and terminate all prior
agreements and understanding between the Parties. There are no covenants,
promises, agreements, warranties, representations, conditions or understandings,
either oral or written, between the Parties other than as set forth herein and
therein. No subsequent alteration, amendment, change or addition to this
Agreement, the Stock Purchase Agreement, the Escrow Agreement and the Consent
and Agreement shall be binding upon the Parties hereto unless reduced to writing
and signed by the respective authorized officers of the Parties (and KUCR, in
the case of the Consent and Agreement).

       13.14  NO TRADEMARK RIGHTS. Expect as otherwise provided herein, no
right, express or implied, is granted by this Agreement to use in any manner the
name "ProQuest," "Guilford," or any other trade name or trademark of the other
Party or its Affiliates in connection with the performance of this Agreement.

       13.15  ACCRUED RIGHTS; SURVIVING OBLIGATIONS. Unless explicitly provided
otherwise in this Agreement, termination, relinquishment or expiration of the
Agreement for any reason shall be without prejudice to any rights which shall
have accrued to the benefit to any Party prior to such termination,
relinquishment or expiration, including damages arising from any breach
hereunder. Such termination, relinquishment or expiration shall not relieve any
Party from obligations which are expressly indicated to survive termination or
expiration of the Agreement.

                                     - 28 -
<PAGE>   29

       13.16  SCHEDULES AND EXHIBITS. The following Schedules and Exhibits are
attached hereto to this Agreement and made a part of this Agreement:

                      Schedule       Description
                      --------       -----------

                         1           Description of PQ-1002
                         2           ProQuest Patent Rights
                         3           Infusion Study
                         4           Disclosure Schedule

                        Exhibit      Description
                        -------      -----------
                         A           Stock Purchase Agreement
                         B           Escrow Agreement
                         C           Consent and Agreement

       13.17  AMBIGUITIES. Ambiguities, if any, in this Agreement shall not be
construed against any Party, irrespective of which Party may be deemed to have
authored the ambiguous provision.

                                     - 29 -
<PAGE>   30

       IN WITNESS WHEREOF, the Parties have executed this Agreement in duplicate
originals by their duly authorized officers as of the date and year first above
written.

<TABLE>
<S>                                 <C>
PROQUEST:                            GUILFORD:

PROQUEST PHARMACEUTICALS INC.        GUILFORD PHARMACEUTICALS INC.

By:  /s/  Osborne S. Wong            By:  /s/ Thomas C. Seoh
     ---------------------                ------------------
Name: Osborne S. Wong                Name:  Thomas C. Seoh
Title: President                     Title: Senior Vice President, General Counsel
                                            and Secretary
</TABLE>

                                     - 30 -
<PAGE>   31

                                                                      Schedule 1

                             Description of PQ-1002

                                        *

*The asterisk denotes that confidential portions of this exhibit have been
omitted in reliance on Rule 24b-2 of the Securities Exchange Act of 1934. The
confidential portions have been submitted separately to the Securities and
Exchange Commission.

<PAGE>   32

                                                                      Schedule 2

                         List of ProQuest Patent Rights

1.          *
2.          *

These patent applications are included within the definition of ProQuest Patent
Rights to the extent they cover a composition of matter, use method, process or
other matter relating to PQ 1002 or any other Agreement Compound.

*The asterisk denotes that confidential portions of this exhibit have been
omitted in reliance on Rule 24b-2 of the Securities Exchange Act of 1934. The
confidential portions have been submitted separately to the Securities and
Exchange Commission.

<PAGE>   33

                                                                      Schedule 3

                                 Infusion Study

                                        *

*The asterisk denotes that confidential portions of this exhibit have been
omitted in reliance on Rule 24b-2 of the Securities Exchange Act of 1934. The
confidential portions have been submitted separately to the Securities and
Exchange Commission.

<PAGE>   34
                                                                      Schedule 4

                               Disclosure Schedule

Section 4.1

     The Company is qualified to do business in Kansas (by way of its
incorporation in Kansas).

Section 4.2

     The authorized capital stock of the Company is as follows:

         3,000,000 shares of common stock, par value $.001 per share.
         3,000,000 shares of non-voting stock, par value $.001 per share.
         1,000,000 shares of preferred stock, par value $.001 per share.

     The current stockholders of the Company are as follows:

<TABLE>
<CAPTION>

        Shareholder                      Shares of Common Stock
        -----------                      ----------------------
        <S>                              <C>

        *                                       *

</TABLE>

Section 4.3

     The financial statements referred to in Section 4.3 are attached hereto.

     *

*The asterisk denotes that confidential portions (15 pages) of this exhibit
have been omitted in reliance on Rule 24b-2 of the Securities Exchange Act of
1934. The confidential portions have been submitted separately to the
Securities and Exchange Commission.

<PAGE>   35
                                                                       Exhibit A

                            STOCK PURCHASE AGREEMENT

     THIS STOCK PURCHASE AGREEMENT (this "Agreement") is entered into as of
March 2, 2000 by and between ProQuest Pharmaceuticals Inc., a Kansas corporation
with an address at 4913 Stoneback Place, Lawrence, Kansas 66047 (the "Company")
and Guilford Pharmaceuticals Inc., a Delaware corporation, with a business
address at 6611 Tributary Street, Baltimore, Maryland 21224 ("Guilford").

     WHEREAS, the Company and Guilford are entering into a License, Development,
and Commercialization Agreement, contemporaneously with the execution of this
Agreement, for a compound known to the parties as PQ-1002 (the "License
Agreement"), pursuant to which Guilford will, among other things, conduct
development and commercialization activities for PQ-1002 and, in certain
circumstances, related compounds;

     WHEREAS, as partial consideration for the License Agreement and in
accordance with the terms of the License Agreement, Guilford may choose on the
Determination Date (as defined in the License Agreement) to purchase, up to a
certain number of shares of the Company's common stock, par value $.001 per
share for an aggregate consideration of $1 million dollars, $500,000 of which
has been paid to the Company upon execution of the License Agreement and the
balance of which has been placed in escrow pursuant to an Escrow Agreement by
and among the Company, Guilford, and First Union National Bank, as Escrow Agent,
(the "Escrow Agreement"), a copy of which is attached as Exhibit B to the
License Agreement and incorporated by reference herein;

     WHEREAS, upon the achievement of certain Milestones (as defined in the
License Agreement), Guilford desires to purchase additional shares of the
Company's common stock, subject to certain limitations hereinafter set forth
herein and subject further to the terms of a Voting Agreement between the
parties hereto of even date herewith;

     WHEREAS, the Company desires to issue to Guilford, and Guilford desires to
subscribe for and acquire from the Company, an equity interest in the Company,
upon the terms and conditions hereinafter set forth; and

<PAGE>   36
     WHEREAS, the parties contemplate that the first closing of the investments
contemplated hereby shall occur within ten (10) days of the Determination Date
(the "First Closing").

     NOW, THEREFORE, in consideration of the foregoing and of the mutual
covenants and agreements hereinafter set forth, the parties hereto agree as
follows:

1.   Definitions

     For all purposes of this Agreement, certain capitalized terms specified in
Exhibit A shall have the meanings set forth in that Exhibit A, except as
otherwise expressly provided herein and all capitalized terms not defined in
Exhibit A or herein shall have the meanings ascribed to them in the License
Agreement, a copy of which is attached hereto as Exhibit B.

2.   Sale and Purchase of Shares

     2.1 Sale and Purchase of Shares

     On the basis of the representations, warranties and agreements contained
herein, and subject to the terms and conditions hereof, the Company agrees to
issue to Guilford, and Guilford agrees to purchase from the Company, at the
First Closing described below, 133,333 shares of Company's Common Stock, par
value $0.001 per share (the "Common Stock") for an aggregate purchase price of
$1 million and an additional number of shares of the Company's Common Stock, at
a price calculated as set forth below, at Additional Closings to occur upon the
achievement of certain Milestones as set forth in the License Agreement.

     2.2  Payments and Deliveries at the Closings

     (a)  FIRST CLOSING. A First Closing shall occur, if, on or before the
Determination Date, Guilford provides written instructions to the Escrow Agent
advising that Guilford desires to proceed with the Development and
Commercialization of an Agreement Compound pursuant to the License Agreement. If
Guilford fails to provide written instructions in this manner, then there shall
be no First Closing and any payments previously made by Guilford to ProQuest
and/or the Escrow Agent shall be distributed to the parties in accordance with
Section 5.2 of the License Agreement. At the First Closing, the Company shall
issue an aggregate of 133,333 shares of Common Stock to Guilford for an
aggregate purchase price of $1 million dollars of which $500,000 was paid to the
Company in connection with the signing of the License Agreement and the balance
of $500,000 shall be released at the First

<PAGE>   37
Closing by the Escrow Agent to the Company in accordance with the terms of the
Escrow Agreement.

     (b)  ADDITIONAL CLOSINGS. The additional shares of Common Stock to be
issued upon achievement of each Milestone shall be issued at one or more
Additional Closings, at a price per share equal to 110% of the price per share
of the Company's Common Stock, par value $.001 per share (or conversion price
per share of securities convertible into the Company's Common Stock) issued in
the Company's most recent "Qualified Equity Infusion" prior to the relevant
Additional Closing. For purposes of this SECTION 2.2.(b), Qualified Equity
Infusion shall mean the most recent equity investment of $500,000 or more in any
shares of Common Stock or any security which is convertible into, exchangeable
for, or exercisable for any shares of Common Stock, which may include any
purchase of Common Stock pursuant to this Agreement, by a non-affiliate of the
Company in a bona fide, arms length transaction. The number of shares
deliverable at an Additional Closing shall equal the relevant Milestone Payment
divided by the relevant purchase price per share.

     (c)  CERTIFICATION AND DELIVERY OF SHARES. Each Additional Closing
shall take place, subject to the terms and conditions hereof, within five (5)
business days following receipt by Guilford of a certificate by the Chief
Executive Officer of the Company setting forth the number and price per share of
Common Stock to be issued at the Additional Closing and reasonable supporting
information to confirm the calculation of the price per share to be paid at the
Additional Closing, including information concerning any prior Qualified Equity
Infusion. Such notice shall be given to Guilford no later than thirty (30) days
following the Company's receipt of Guilford's notice contemplated by Section
5.3(e) of the License Agreement.

     The aggregate cash consideration paid by Guilford at each Additional
Closing, if any, shall be that amount set forth in the License Agreement for
achievement of the Milestone for which the Additional Closing is being held. The
Company agrees to take all such actions as may be necessary to ensure that all
such shares of Common Stock may be so issued without violation of any applicable
law or governmental regulation or any requirements of any domestic securities
exchange upon which shares of Common Stock may be listed (except for official
notice of issuance which shall be immediately delivered by the Company upon each
such issuance). All shares of Common Stock which are so issuable shall, when
issued, be duly authorized and validly issued, fully paid and nonassessable and
free from all taxes, liens and charges.
<PAGE>   38
     (d)  LIMIT ON GUILFORD OWNERSHIP. In the event that the purchase of shares
as payment for a Milestone payment shall cause Guilford to own twenty percent
(20%) or more of the then issued and outstanding Common Stock of the Company,
Guilford agrees to purchase only such amount of shares of Common Stock at the
Additional Closing that will not result in Guilford's aggregate ownership of
Common Stock exceeding 19.9% of the then issued and outstanding Common Stock of
the Company. Any balance due from Guilford upon achievement of the Milestone
which cannot be paid through purchase of the Common Stock due to the limitations
set forth above shall be paid in cash.

<PAGE>   39

       2.3.   PIGGYBACK REGISTRATION RIGHTS

              (a)    REQUEST. If at any time or times after the date of this
Agreement the Company proposes to make a registered public offering of any of
its securities under the Act (whether to be sold by it or by it and one or more
selling stockholders) other than an offering registered on Form S-8, Form S-4,
or successor forms relating to employee stock plans and business combinations,
the Company shall, not less than 20 days prior to the proposed filing date of
the registration form, give written notice of the proposed registration to
Guilford specifying in reasonable detail the proposed transaction to be covered
by the registration statement, and at the written request of Guilford delivered
to the Company within 10 days after giving such notice, shall include in such
registration and offering, and in any underwriting of such offering, all
securities designated by Guilford. The Company shall have no obligation to
include shares of Common Stock owned by Guilford in a registration statement
pursuant to this SECTION 2.3, unless and until Guilford (a) in connection with
any underwritten offering, agrees to enter into an underwriting agreement, a
custody agreement and power of attorney and any other customary documents
required in an underwritten offering all in customary form and containing
customary provisions (but not requiring Guilford to provide indemnification or
contribution to the underwriters or the Company) and (b) shall have furnished
the Company with all information and statements about or pertaining to Guilford
in such reasonable detail and on such timely basis as is reasonably deemed by
the Company to be legally required with respect to the preparation of the
registration statement.

              (b)    REDUCTION. If a registration in which Guilford has the
right to participate pursuant to this SECTION 2.3 is an underwritten
registration, and the managing underwriters advise the Company in writing that
in their opinion the number of securities requested to be included in such
registration exceeds the number which can be sold in such offering, the Company
shall include in such registration (i) first, the securities of the Company
proposed to be sold by the Company, and (ii) second, the shares of Common Stock
proposed to be sold by (A) Guilford and (B) any other stockholders proposing to
sell shares of Common Stock pursuant to such registration, with the shares
described in this clause (ii) to be included on a pro rata basis.

       2.4.   REGISTRATION PROCEDURES

              (a)    Whenever Guilford has requested that any shares of Common
Stock be registered pursuant to SECTION 2.3 hereof, the Company shall, as
expeditiously as reasonably possible:

                     (1)    prepare and file with the SEC a registration
statement with respect to such shares and use commercially reasonable efforts to
cause such registration statement to become effective as soon as reasonably
practicable

                                      -4-
<PAGE>   40

thereafter (provided that before filing a registration statement or
prospectus or any amendments or supplements thereto, the Company shall furnish
counsel for Guilford with copies of all such documents proposed to be filed);

                     (2)    prepare and file with the SEC such amendments and
supplements to such registration statement and prospectus used in connection
therewith as may be necessary to keep such registration statement effective for
a period of not less than 90 days or until Guilford has completed the
distribution described in such registration statement, whichever occurs first;

                     (3)    furnish to Guilford such number of copies of such
registration statement, each amendment and supplement thereto, the prospectus
included in such registration statement (including each preliminary prospectus),
and such other documents as Guilford may reasonably request;

                     (4)    use its commercially reasonable efforts to register
or qualify such shares under such other securities or blue sky laws of such
jurisdictions as Guilford requests (and to maintain such registrations and
qualifications effective for a period of 90 days or until Guilford has completed
the distribution of such shares, whichever occurs first), and to do any and all
other acts and things which may be necessary or advisable to enable Guilford to
consummate the disposition in such jurisdictions of such shares (provided that
the Company will not be required to (i) qualify generally to do business in any
jurisdiction where it would not be required but for this subsection (4), (ii)
subject itself to taxation in any such jurisdiction, or (iii) file any general
consent to service of process in any such jurisdiction); provided that,
notwithstanding anything to the contrary in this Agreement with respect to the
bearing of expenses, if any such jurisdiction shall require that expenses
incurred in connection with the qualification of such shares in that
jurisdiction be borne in part or full by Guilford, then Guilford shall pay such
expenses to the extent required by such jurisdiction;

                     (5)    notify Guilford, at any time when a prospectus
relating thereto is required to be delivered under the Act within the period
that the Company is required to keep the registration statement effective, of
the happening of any event as a result of which the prospectus included in any
such registration statement contains an untrue statement of a material fact or
omits any fact necessary to make the statements therein not misleading, and
promptly prepare, file and furnish to Guilford a supplement or amendment to such
prospectus so that, as thereafter delivered to the purchasers of such shares,
such prospectus will not contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or, in light of the
circumstances then existing, necessary to make the statements therein not
misleading;

                     (6)    cause all such shares to be listed on securities
exchanges, if any, on which similar securities issued by the Company are then
listed;

                                      -5-
<PAGE>   41

                     (7)    provide a transfer agent and registrar for all such
shares not later than the effective date of such registration statement;

                     (8)    enter into such customary agreements and take all
such other actions as Guilford reasonably requests (and subject to its
reasonable approval) in order to expedite or facilitate the disposition of such
shares; and

                     (9)    make available for inspection by Guilford, by any
underwriter participating in any distribution pursuant to such registration
statement, and by any attorney, accountant or other agent retained by Guilford
or by any such underwriter, all financial and other records, pertinent corporate
documents, and properties (other than confidential intellectual property) of the
Company.

              (b)    GUILFORD EXPENSES. If, pursuant to SECTION 2.3 hereof, the
a portion of Guilford's Common Stock is included in a registration statement,
then Guilford shall pay all transfer taxes, if any, relating to the sale of its
shares, and any underwriting discounts or commissions or the equivalent thereof
applicable to the sale of its shares.

              (c)    COMPANY EXPENSES. Except for the fees and expenses
specified in SECTION 2.4.(a) hereof and except as provided below in this SECTION
2.4.(b), the Company shall pay all expenses incident to the registration of
shares by the Company and Guilford pursuant to SECTIONS 2.4, and to the
Company's performance of or compliance with this Agreement, including, without
limitation, all registration and filing fees, fees and expenses of compliance
with securities or blue sky laws, underwriting discounts, fees and expenses
(other than Guilford's portion of any underwriting discounts or commissions or
the equivalent thereof), printing expenses, messenger and delivery expenses, and
fees and expenses of counsel for the Company and counsel for Guilford and all
independent certified public accountants and other persons retained by the
Company.

              Notwithstanding anything to the contrary contained in this SECTION
2.4, in the event the Company determines in its reasonable judgment that it may
be advisable to delay a registration statement described in SECTION 2.3 or to
withdraw such registration statement if such registration statement has already
been filed, the Company may withdraw such registration statement or delay the
filing of such registration statement, for a period not in excess of 90 days.
Such right to delay a request will not be exercised by the Company more than
once in any 12-month period.

                                      -6-
<PAGE>   42

       2.5.   ADJUSTMENT OF NUMBER OF SHARES ISSUED UPON ISSUANCE OF COMMON
              STOCK.

              After the First Closing, if and whenever the Company shall issue
or sell any shares of Common Stock or other equity securities of the Company
convertible into Common Stock of the Company or any Option or Convertible
Securities for, (both as defined below), a price per share of Common Stock or
Common Stock equivalent less than Five Dollars ($5.00) per share (except for the
issuance of (i) up to an additional 50,000 shares (as adjusted for stock splits,
distributions, combinations or the like) of Common Stock to the University of
Kansas Center for Research, Inc. ("KUCR") pursuant to the License Agreement
dated as of April 2, 1999, between KUCR and the Company, or (ii) any additional
shares of Common Stock and/or Options (and the shares of Common Stock issuable
upon the exercise of such Options) issued to directors, consultants or employees
of the Company under any stock option or other equity incentive plan approved by
the Board of Directors or its Compensation Committee) (in each such case, a
"Dilutive Financing"), the Company shall within thirty (30) calendar days
following a Dilutive Financing issue to Guilford that number of shares of Common
Stock that shall equal the additional number of shares of Common Stock Guilford
could have purchased at the First Closing and any Additional Closing which has
occurred, for the aggregate consideration paid by Guilford, had the price per
share paid by Guilford, at each Closing been reduced to the price at which the
Company issued or sold, or is deemed to have issued or sold, the shares of
securities in the Dilutive Financing, subject to the limitations set forth in
Section 2.2(d) hereof.

              For purposes of this SECTION 2.5, the following subparagraphs (a)
to (f) shall be applicable, subject to the provisions set forth in clauses (i)
and (ii) of the preceding paragraph:

              (a)    ISSUANCE OF RIGHTS OR OPTIONS. In case at any time the
Company shall in any manner grant (whether directly or by assumption in a merger
or otherwise) any warrants or other rights to subscribe for or to purchase, or
any options for the purchase of, Common Stock or any stock or security
convertible into or exchangeable for Common Stock (such warrants, rights or
options being called "Options" and such convertible or exchangeable stock or
securities being called "Convertible Securities"), whether or not such Options
or the right to convert or exchange any such Convertible Securities are
immediately exercisable, and the price per share for which Common Stock is
issuable upon the exercise of such Options or upon the conversion or exchange of
such Convertible Securities (determined by dividing (i) the total amount, if
any, received or receivable by the Company as consideration for the granting of
such Options, plus the minimum aggregate amount of additional consideration
payable to the Company upon the exercise of all such Options, plus, in the case
of such Options which relate to Convertible Securities, the minimum aggregate
amount of additional consideration, if any, payable upon the issue or sale of
such Convertible Securities and upon the

                                      -7-
<PAGE>   43

conversion or exchange thereof, by (ii) the total maximum number of shares of
Common Stock issuable upon the exercise of all such Options or upon the
conversion or exchange of all such Convertible Securities issuable upon the
exercise of such Options) shall be less than Five Dollars ($5.00) per share of
Common Stock, then such issuance shall be deemed a Dilutive Financing, and the
total maximum number of shares of Common Stock issuable upon the exercise of
such Options or upon conversion or exchange of the total maximum amount of such
Convertible Securities issuable upon the exercise of such Options shall be
deemed to have been issued for such price per share as of the date of granting
of such Options or the issuance of such Convertible Securities and thereafter
shall be deemed to be outstanding. Except as otherwise provided in subparagraph
(c), no adjustment in the number of shares issued to Guilford shall be made upon
the actual issue of such Common Stock or of such Convertible Securities, upon
the exercise of such Options or upon the actual issue of such Common Stock upon
conversion or exchange of such Convertible Securities.

              (b)    ISSUANCE OF CONVERTIBLE SECURITIES. In case the Company
shall in any manner issue (whether directly or by assumption in a merger or
otherwise) or sell any Convertible Securities, whether or not the rights to
exchange or convert any such Convertible Securities are immediately exercisable,
and the price per share for which Common Stock is issuable upon such conversion
or exchange (determined by dividing (i) the total amount received or receivable
by the Company as consideration for the issue or sale of such Convertible
Securities, plus the minimum aggregate amount of additional consideration, if
any, payable to the Company upon the conversion or exchange thereof, by (ii) the
total maximum number of shares of Common Stock issuable upon the conversion or
exchange of all such Convertible Securities) shall be less than Five Dollars
($5.00) per share of Common Stock, then such issuance of Convertible Securities
shall be deemed a Dilutive Financing and the total maximum number of shares of
Common Stock issuable upon conversion or exchange of all such Convertible
Securities shall be deemed to have been issued for such price per share as of
the date of the issue or sale of such Convertible Securities and thereafter
shall be deemed to be outstanding, provided that except as otherwise provided in
subparagraph (c), no adjustment of the number of shares issued to Guilford shall
be made upon the actual issue of such Common Stock upon conversion or exchange
of such Convertible Securities and if any such issue or sale of such Convertible
Securities is made upon exercise of any Options to purchase any such Convertible
Securities for which adjustments of the number of shares issued to Guilford as a
result of a Dilutive Financing have been or are to be made pursuant to other
provisions of this Section, no further adjustment of the number of shares issued
to Guilford shall be made by reason of such issue or sale. Notwithstanding
anything to the contrary above, if the conversion rate for any Convertible
Securities is not known at the date of issuance of the Convertible Securities,
the determination of whether or not such issuance is a Dilutive Financing shall
be made on the first date on which such Convertible Securities are converted
into Common Stock. Any subsequent adjustment to the

                                      -8-
<PAGE>   44

conversion rate of such Convertible Securities shall be governed by the
provisions of subparagraph (c).

              (c)    CHANGE IN OPTION PRICE OR CONVERSION RATE. In the event
that the Option purchase price referred to in subparagraph (a) decreases, or
consideration payable upon the conversion or exchange of any Convertible
Securities referred to in subparagraph (a) or (b) is reduced, or the conversion
rate for Convertible Securities referred to in subparagraph (a) or (b) changes
such that additional shares of common stock are issued at any time (including,
but not limited to, changes under or by reason of provisions designed to protect
against dilution but excluding shares issued in connection with stock splits,
distributions, combinations or the like), then such change shall be deemed a
Dilutive Financing and the applicable number of shares of Common Stock issued to
Guilford shall be increased to the number of shares of Common Stock which would
have been issued had such Options or Convertible Securities still outstanding
provided for such changed purchased price, consideration or conversion rate, as
the case may be, at the time initially granted, issued or sold.

              (d)    CONSIDERATION FOR STOCK. In case the Company issues or
sells any shares of Common Stock, Options or Convertible Securities for cash,
the consideration received therefor shall be deemed to be the amount received by
the Company therefor, without deduction therefrom of any amounts paid or
receivable for accrued interest or accrued dividends and any expenses incurred
or any underwriting commissions or concessions paid or allowed by the Company in
connection therewith. In case the Company issues or sells any shares of Common
Stock, Options or Convertible Securities for consideration other than cash, the
amount of the consideration other than cash received by the Company shall be
deemed to be the fair value of such consideration as determined in good faith by
the Board of Directors of the Company, without deduction of any amounts paid or
receivable for accrued interest and any expenses incurred or any underwriting
commissions or concessions paid or allowed by the Company in connection
therewith. In case the Company shall issue any Options in connection with the
issue and sale of other securities of the Company, together comprising one
integral transaction in which no specific consideration is allocated to such
Options by the parties thereto, such Options shall be deemed to have been issued
for such consideration as determined in good faith by the Board of Directors of
the Company.

              (e)    RECORD DATE. In case the Company shall take a record of the
holders of its Common Stock for the purpose of entitling them (i) to receive a
dividend or other distribution payable in Common Stock, Options or Convertible
Securities or (ii) to subscribe for or purchase Common Stock Options or
Convertible Securities, then such record date shall be deemed to be the date of
the issue or sale of the of the Common Stock, Options or Convertible Securities
issued or sold upon the making of such dividend or other distribution or the
date of the granting of such right of subscription or purchase, as the case may
be.

                                      -9-
<PAGE>   45

              (f)    TREASURY SHARES. The disposition of any shares of Common
Stock owned or held by or for the account of the Company shall be considered an
issue or sale of Common Stock for the purpose of this SECTION 2.5, but while
held as Treasury Shares shall not be included in the number of shares of Common
Stock outstanding.

       2.6.   REPURCHASE OPTION.

              (a)    REPURCHASE AT THE OPTION OF THE COMPANY. During a period of
thirty (30) days following the receipt of a New Drug Application ("NDA")
approval from the U.S. Food and Drug Administration relating to PQ-1002 or
another Agreement Compound (as defined in the License Agreement), the Company
may, by written notice to Guilford, require Guilford to sell that portion of the
shares of Common Stock previously sold to Guilford under this Agreement and then
owned by Guilford such that Guilford, after giving effect to the repurchase by
the Company, shall own no more than 10% of the then issued and outstanding
Common Stock of the Company. The repurchase price per share (the "Repurchase
Price") shall be equal to the original purchase price per share of Common Stock
(as adjusted for any Dilutive Financing) repurchased plus (i) any declared but
unpaid dividends as of the Repurchase Date (as defined below) and (ii) an
additional amount calculated at a compounded annual rate of ten percent (10%) of
the original purchase price per share of Common Stock accrued from the date of
issuance. The Company shall repurchase shares of Common Stock in descending
order of price based upon the prices at which the shares were issued to
Guilford.

              (b)    REPURCHASE PAYMENT; NOTICE. The Company shall pay the
Repurchase Price for the shares of Common Stock to be repurchased on a date (the
"Repurchase Date") no later than thirty (30) days after the date of the notice
described in Section 2.6(a) above. Not less than seven (7) business days prior
to the applicable Repurchase Date, the Company shall deliver to Guilford a
further notice stating the Repurchase Date and the Repurchase Price. Guilford
shall thereafter surrender its certificate or certificates representing the
shares to be repurchased to the Company or deliver an affidavit of lost
certificate in accordance with the Kansas corporation law instead of such
certificate(s) at a closing to take place at a mutually agreed upon location no
later than the Repurchase Date (the "Repurchase Closing") and the Company shall
at the Repurchase Closing, against delivery of the shares or affidavit of lost
certificates, repurchase the applicable shares by paying the Repurchase Price by
certified check or wire transfer to an account designated by Guilford.

                                      -10-
<PAGE>   46

3.     ADDITIONAL UNDERTAKINGS AND COVENANTS

The Company and Guilford hereby covenant and agree as follows:

       3.1.   CONSENTS AND APPROVALS

              (a)    The Company and Guilford shall take all measures reasonably
necessary or advisable to secure such consents, authorizations and approvals of
governmental and supragovernmental authorities and of private persons or
entities with respect to the transactions contemplated by this Agreement, and to
the performance of all other obligations of such parties hereunder, as may be
required by any applicable statute or regulation of the United States or any
country, state or other jurisdiction or by any Agreement of any kind whatsoever
applicable to the Company or Guilford.

              (b)    The Company and Guilford shall (i) cooperate in the filing
of all forms, notifications, reports and information, if any, required or
reasonably deemed advisable pursuant to applicable statutes, rules, regulations
or orders of any governmental or supragovernmental authority in connection with
the transactions contemplated by this Agreement and (ii) use their respective
good faith efforts to cause any applicable waiting periods thereunder to expire
and any objections to the transactions contemplated hereby to be withdrawn
before the Closing.

       3.2.   ACCESS OF GUILFORD TO INFORMATION

              The Company shall provide to Guilford and its representatives at
least thirty (30) days prior written notice of any Dilutive Financing.

       3.3.   CONFIDENTIALITY

              (a)    Guilford hereby acknowledges that it has obtained and may
continue to obtain knowledge of and access to confidential and valuable business
information relating to the Company not generally known by or available to the
general public. Guilford agrees at all times after the date hereof to use
reasonable efforts, consistent with those employed by it with respect to its own
confidential information, (i) to keep confidential all such information that is
identified as being of a confidential nature, (ii) not to use such confidential
information on its own behalf, except in connection with the transactions
contemplated hereby, or on behalf of any other person, firm or entity, and (iii)
not to disclose such confidential information to any third party (other than to
its counsel, accountants and other consultants in connection with the
transactions contemplated hereby) without the Company's advance written
authorization; provided, however, that Guilford shall have no such obligations
with respect to confidential information that (A) was lawfully obtained by it
not subject to restrictions of confidentiality; (B) is a matter of public
knowledge; (C) has been or is hereafter publicly disclosed other than by or
                                      -11-
<PAGE>   47

through Guilford; or (D) is required to be disclosed by law or judicial process.
In the event this Agreement is terminated prior to the First Closing, Guilford
will return to the Company or destroy, at such Person's option, all documents,
workpapers and other materials Furnished to Guilford relating to the
transactions contemplated hereunder, whether obtained before or after the
execution of this Agreement. In the event of a breach or threatened breach by
Guilford of the provisions of this Section, the Company shall be entitled to an
injunction restraining Guilford from disclosing, in whole or in part, such
information.

              (b)    The Company hereby acknowledges that it has obtained and
may continue to obtain knowledge of and access to confidential and valuable
business information relating to Guilford not generally known by or available to
the general public. The Company agrees at all times after the date hereof to use
reasonable efforts consistent with those employed by it with respect to its own
confidential information, (i) to keep confidential all such information that is
identified by Guilford as being of a confidential nature, (ii) not to use such
confidential information on its own behalf, except in connection with the
transactions contemplated hereby, or on behalf of any other person, firm or
entity, and (iii) not to disclose such confidential information to any third
party (other than to the Company's counsel, accountants and other consultants in
connection with the transactions contemplated hereby) without Guilford's advance
written authorization; provided, however, that the Company shall have no such
obligations with respect to confidential information that (A) was lawfully
obtained by the Company not subject to restrictions of confidentiality; (B) is a
matter of public knowledge; (C) has been or is hereafter publicly disclosed; or
(D) is required to be disclosed by law or judicial process. At the request of
Guilford, the Company will return to Guilford or destroy, at the Company's
option, all documents, work papers and other materials Furnished to the Company
relating to Guilford and the transactions contemplated hereunder, whether
obtained before or after the execution of this Agreement. In the event of a
breach or threatened breach by the Company of the provisions of this Section,
Guilford shall be entitled to an injunction restraining such Person, as the case
may be, from disclosing, in whole or in part, such information.

       3.4.   AMENDMENTS TO THE COMPANY'S CERTIFICATE OF INCORPORATION

              The Company shall take all actions (corporate and otherwise)
necessary to duly authorize, adopt, file and otherwise make effective on or
prior to each Closing Date amendments and supplements to the certificate of
incorporation of the Company, if and to the extent necessary, in form
satisfactory to Guilford in order to carry out the purpose of this Agreement.

                                      -12-
<PAGE>   48

       3.5.   NEWS RELEASES

              Neither Guilford nor the Company shall issue or approve any news
release or other public announcement concerning the transactions contemplated by
this Agreement without the prior approval of the other Party hereto, which
approval shall not be unreasonably withheld. Notwithstanding the foregoing,
Guilford (subject to the provisions of Section 7.2 and 7.5 of the License
Agreement) may make such news release or other public announcements without the
consent of ProQuest if such disclosure is necessary, in the good faith opinion
of management, to comply with applicable laws requiring the disclosure of
material events.

       3.6.   SUBSEQUENT EVENTS

              The Company shall notify Guilford promptly in writing of the
occurrence of any event, or the failure of any event to occur, prior to each
Closing that results in an omission from, or breach of, any of the covenants,
representations or warranties made by or on behalf of the Company in this
Agreement, the Disclosure Schedule or any other Document Furnished in connection
with or pursuant to this Agreement, but such notification shall not excuse
breaches of representations, warranties, covenants or agreements disclosed in
such notification.

       3.7.   CHANGE OF CONTROL

                     (a) In the event that the Company or its stockholders
collectively controlling the Company desire to enter into a transaction or
series of transactions which, if consummated, would result in shareholders of
the Company who collectively control the Company receiving a cash payment for
their shares of the Company's common stock at a price per share greater than the
highest price paid by Guilford for any shares purchased pursuant to this
Agreement, including in the Additional Closing caused by operation of this
Section 3.7 (the "Change in Control Price"), Guilford shall have the obligation,
but only concurrently with a closing of the change in control transaction
contemplated hereby which also results in all of Guilford's shares of the
Company's Common Stock being purchased at such Change in Control Price, to
accelerate its payment of the portion of the Milestone payment(s) to be used to
purchase shares of the Company's common stock (as provided in Section 2.2(b),
but limited as set forth in Section 2.2(d))(regardless of whether the
Milestone(s) have been achieved), and the Company shall issue such shares of
Common Stock on such accelerated basis. The Company shall notify Guilford of the
change in control transaction no fewer than thirty (30) days in advance of the
consummation of the transaction. The Company shall provide Guilford with the
certificate specified in Section 2.2(c) within five (5) business days of the
date of the notice of the change in control transaction. The remaining cash
payment portions of the Milestone payment(s) shall remain due upon achievement
of the Milestone(s) as set forth in the License Agreement.

                                      -13-
<PAGE>   49

              (b) The rights and obligations of this Section 3.7 shall terminate
and be of no further effect upon the Company's initial public offering of Common
Stock.

4.     REPRESENTATIONS AND WARRANTIES OF THE COMPANY

              Except as specifically set forth in the Disclosure Schedule (with
a disclosure with respect to a Section of this Agreement to require a specific
reference in the Disclosure Schedule to the Section of this Agreement to which
each such disclosure applies, and no disclosure to be deemed to apply with
respect to any Section to which it does not expressly apply), the Company
represents and warrants as of signing and as of the First Closing and each
Additional Closing (which representation and warranty (subject to delivery by
the Company to Guilford of updated Disclosure Schedules), which representations
and warranties shall be deemed to include the disclosure with respect thereto so
specified in the Disclosure Schedule), as updated, to Guilford as follows:

       4.1.   ORGANIZATION AND STANDING

              The Company, is a corporation duly organized, validly existing and
in good standing under the laws of the State of Kansas, and has the full
corporate power and corporate authority to own, operate and lease their
respective Assets, to carry on its business as currently conducted and to carry
out the transactions contemplated hereby. The Company has made available to
Guilford complete and correct copies of the governing instruments of the Company
in effect on the date of this Agreement. The Company is duly qualified or
registered to conduct business and is in good standing in the states, countries
and territories listed on the Disclosure Schedule. The Company is not qualified
to do business in any jurisdiction which is not listed on the Disclosure
Schedule, and neither the nature of the business conducted by, nor the character
of the Assets owned, leased or otherwise held by the Company makes such
qualification necessary, except to the extent the failure to be so qualified in
any jurisdiction would not have a Material Adverse Effect on the Company.

       4.2.   CAPITAL STRUCTURE OF THE COMPANY

              The Disclosure Schedule sets forth (a) the authorized capital
stock of the Company and a true and accurate list of all of the stockholders of
the Company. All shares of capital stock of the Company have been duly
authorized and validly issued and are outstanding, fully paid and nonassessable.
The shares of Common Stock to be purchased and sold pursuant to this Agreement,
will, upon the issuance thereof, be duly authorized, validly issued, fully paid
and nonassessable. Except as set forth on the Disclosure Schedule, no shares of
capital stock of the Company (preemptive or otherwise), or warrants to purchase
or to subscribe for any shares of such stock or other securities of the Company
are outstanding. There are no

                                      -14-
<PAGE>   50

outstanding Agreements affecting or relating to the voting, issuance, purchase,
redemption, repurchase, transfer or registration for sale under the Securities
Act of any securities of the Company, except as contemplated hereunder or
described in the Disclosure Schedule.

       4.3.   FINANCIAL STATEMENTS

              The Company has prepared and Furnished to Guilford and there are
included as exhibits that are part of the Disclosure Schedule, the unaudited
consolidated balance sheets of the Company for the one year periods ending
December 31, 1997, 1998 and 1999, and the unaudited statements of income,
stockholders' equity and changes in financial position for each such one year
period. The 1999 financial statements are in draft form on the Effective Date.
All of the financial statements, including, without limitation, the notes
thereto, referred to in this Section or Furnished to Guilford after the date
hereof pursuant to this Agreement: (i) were in accordance with the books and
records of the Company, (ii) presented fairly, in all material respects, the
consolidated financial position of the Company as of the respective dates and
the results of operations and changes in financial position for the respective
periods indicated, and (iii) were prepared in accordance with generally accepted
accounting principles applied on a basis consistent with prior accounting
periods or Statements for Accounting and Review Services issued by the American
Institute of Certified Public Accountants. The Disclosure Schedule sets forth
all changes in accounting methods (for financial accounting purposes) at any
time made, agreed to, requested or required with respect to the Company.

       4.4.   NO LIABILITIES

              Except as reflected in the financial statements Furnished to
Guilford or as described on the Disclosure Schedule, as of the Effective Date of
the License Agreement, there existed no liabilities (whether contingent or
absolute, matured or unmatured, known or unknown) of the Company other than (i)
those liabilities set forth on the Disclosure Schedule or otherwise incurred in
the Ordinary Course of Business and in amounts that are not material to the
Company, and (ii) for taxes, assessments and other governmental charges, if such
taxes, assessments and other charges (x) are not yet due and payable, or (y) are
due and payable but can be paid hereafter without penalty or interest and for
which a proper accrual relating thereto is reflected in the financial statements
or the Disclosure Schedule and which will be paid before penalty or interest
begins to accrue thereon. Except as described in the Disclosure Schedule, since
the Effective Date of the License Agreement, the Company has not incurred any
liabilities (whether contingent or absolute, matured or unmatured, known or
unknown) other than in the Ordinary Course of Business and in amounts that are
not material to the Company.

                                      -15-
<PAGE>   51

       4.5.   CONDUCT OF BUSINESS; ABSENCE OF MATERIAL ADVERSE CHANGE

              Other than as set forth in the Disclosure Schedule, since the
Effective Date of the License Agreement, and prior to the First Closing, no
event has occurred with respect to the Company that would have a Material
Adverse Effect.

       4.6.   RESTRICTIONS AND CONSENTS

              Except as set forth on the Disclosure Schedule, there are no
Agreements, Laws or other restrictions of any kind to which the Company is a
party or any of its Assets is subject that would prevent or restrict the
execution, delivery or performance of this Agreement or prohibit or materially
limit the continued operation of the business of the Company after the date
hereof on substantially the same basis as heretofore operated, as a result of
the execution, delivery or performance of this Agreement. The Disclosure
Schedule lists all such Agreements and Laws that require the consent or approval
of any person or entity not party to this Agreement with respect to any aspect
of the execution, delivery or performance of this Agreement by the Company.

       4.7.   AUTHORIZATION

              The execution, delivery and performance by the Company of this
Agreement and all other Documents contemplated hereby, the fulfillment of and
compliance with the respective terms and provisions hereof and thereof, and the
consummation by the Company of the transactions contemplated hereby and thereby,
do not and will not, except as would not have a Material Adverse Effect on the
Company: (a) conflict with, or violate any provision of, any Law applicable to
the Company or any of its Assets, or any provision of the articles of
incorporation or bylaws of the Company; (b) conflict with, or result in any
breach of, or constitute a default under any Agreement to which the Company is a
party or by which the Company or any of its Assets; or (c) result in or require
the creation or imposition of or result in the acceleration of any indebtedness,
or of any Encumbrance of any nature upon, or with respect to any of the Assets
of the Company.

       4.8.   ABSENCE OF VIOLATION

              The Company is not in material violation of or material default
under, nor has the Company materially breached, any term or provision of its
articles of incorporation or bylaws or other organization documents or any
material Agreement or restriction to which the Company is a party or by which
the Company or its Assets are bound or affected.

                                      -16-
<PAGE>   52

       4.9.   BINDING OBLIGATION

              This Agreement constitutes a valid and binding obligation of the
Company, enforceable in accordance with its terms; and each Document to be
executed by the Company pursuant hereto, when executed and delivered in
accordance with the provisions hereof, shall be a valid and binding obligation
of the Company, enforceable in accordance with its terms except as
enforceability may be limited or affected by bankruptcy, insolvency,
reorganization, moratorium, fraudulent conveyance and other similar laws and
equitable principles now or hereafter in effect and affecting the rights and
remedies of creditors generally.

       4.10.  DISCLOSURE

              To the Company's knowledge, no representation or warranty by the
Company in this Agreement, and no Document Furnished or to be Furnished to
Guilford pursuant to this Agreement, or in connection herewith or with the
transactions contemplated hereby, contains or will contain any untrue or
misleading statement or omits or will omit any fact necessary to make the
statements contained herein or therein, in light of the circumstances under
which made, not misleading as of the First Closing Date.

5.     REPRESENTATIONS AND WARRANTIES OF GUILFORD

              Guilford hereby represents and warrants to the Company as of
signing and as of each Additional Closing, as follows:

       5.1.   ORGANIZATION AND STANDING

              Guilford is a corporation duly organized, validly existing and in
good standing under the laws of the state of its organization and has the full
corporate power and authority to carry on its business as currently conducted,
to enter into this Agreement and to carry out the transactions contemplated
hereby.

       5.2.   AUTHORIZATION

              The execution, delivery and performance by Guilford of this
Agreement and all other Documents contemplated hereby, the fulfillment of and
the compliance with the respective terms and provisions hereof and thereof, and
the consummation by Guilford of the transactions contemplated hereby and thereby
have been duly authorized (which authorization has not been modified or
rescinded and is in full force and effect), and will not: (a) conflict with, or
violate any term or provision of Guilford's organizational documents or (b)
conflict with, or result in any material breach of, or constitute a material
default under, any Agreement to which Guilford or its Assets are a party or by
which Guilford is bound. No other corporate action is

                                      -17-
<PAGE>   53

necessary for Guilford to enter into this Agreement and all other Documents
contemplated hereby and to consummate the transactions contemplated hereby and
thereby.

       5.3.   BINDING OBLIGATION

              This Agreement constitutes a valid and binding obligation of
Guilford, enforceable in accordance with its terms; and each Document to be
executed by Guilford pursuant hereto, when executed and delivered in accordance
with the provisions hereof, shall be a valid and binding obligation of Guilford,
enforceable in accordance with its terms except as enforceability may be limited
or affected by bankruptcy, insolvency, reorganization, moratorium, fraudulent
conveyance and other similar laws and equitable principles now or hereafter in
effect and affecting the rights and remedies of creditors generally.

       5.4.   NO REGISTRATION UNDER THE SECURITIES ACT

              Guilford understands that the Common Stock to be purchased by it
at each Closing pursuant to the terms of this Agreement has not been and will
not be registered under the Securities Act or any state securities laws and will
be issued in reliance upon exemptions contained in the Securities Act or
interpretations thereof and in the applicable state securities laws, and cannot
be offered for sale, sold or otherwise transferred unless the shares of Common
Stock being acquired hereunder subsequently are so registered or qualify for
exemption from registration under the Securities Act.

       5.5.   ACQUISITION FOR INVESTMENT

              The Common Stock being acquired under this Agreement by Guilford
in good faith solely for its own account, for investment and not with a view
toward distribution within the meaning of the Securities Act. The Shares will
not be offered for sale, sold or otherwise transferred by such Guilford without
either registration or exemption from registration under the Securities Act.

       5.6.   EVALUATION OF MERITS AND RISKS OF INVESTMENT

              Guilford has such knowledge and experience in financial and
business matters that it is capable of evaluating the merits and risks of its
investment in the Common Stock being acquired hereunder. Guilford is an
"accredited investor" within the meaning of one or more paragraphs (1), (2), (3)
or (8) of Rule 501(a) under the Securities Act. Guilford understands and is able
to bear any economic risks associated with such investment (including, without
limitation, the necessity of holding such Common Stock for an indefinite period
of time, inasmuch as such Shares have not been registered under the Securities
Act). Guilford believes it has

                                      -18-
<PAGE>   54

received all the information it considers necessary or appropriate for deciding
whether to purchase the Common Stock. Guilford further represents that it has
had an opportunity to ask questions and receive answers from the Company
regarding the Common Stock and the business, properties and financial condition
of the Company.

       5.7.   LEGENDS

              Guilford acknowledges that, to the extent applicable, each
certificate evidencing the Common Stock shall be endorsed with legends imposed
or required by the Securities Act, applicable state laws or this Agreement and
the related documents referred to herein.

6.     CONDITIONS PRECEDENT TO OBLIGATIONS OF GUILFORD

       6.1.   FIRST CLOSING

              The obligations of Guilford under this Agreement to purchase the
shares of Common Stock to be purchased by it at the First Closing Date are
subject to the fulfillment, at or prior to the First Closing, of each of the
following conditions, and failure to satisfy any such condition shall excuse and
discharge all obligations of Guilford to purchase the shares at the First
Closing, unless such failure is agreed to in writing by Guilford, provided,
however, in all events, the Company shall be entitled to retain the $500,000
payment as specified in SECTION 5.1(i) of the License Agreement.

              (a)    REPRESENTATIONS AND WARRANTIES. The representations and
warranties made by the Company in this Agreement and the statements contained in
the Disclosure Schedule and Exhibits attached hereto or in any Document
Furnished by the Company pursuant to this Agreement shall be true and complete
in all material respects when made, and on and as of the First Closing Date, as
though such representations and warranties were made on and as of such date,
except for any changes occurring in the Ordinary Course of Business and not
material to the Company or as otherwise expressly permitted by this Agreement.

              (b)    PERFORMANCE. The Company shall have performed and complied
in all material respects with all Agreements and conditions required by this
Agreement to be performed or complied with prior to the First Closing Date.

              (c)    ABSENCE OF ADVERSE CHANGES. There shall have been no
changes likely to have a Material Adverse Effect since the date of this
Agreement, in the business, operations, prospects, condition (financial or
otherwise), Assets or liabilities of the Company (regardless of whether or not
such events or changes are

                                      -19-
<PAGE>   55

inconsistent with the representations and warranties given herein by the
Company), except changes contemplated by this Agreement.

              (d)    LEGAL PROCEEDINGS. No action or proceeding by or before any
governmental authority shall have been instituted or, to the Company's
knowledge, threatened (and not subsequently settled, dismissed or otherwise
terminated) which is reasonably expected to have a Material Adverse Effect on
the Company or to restrain, prohibit or invalidate the transactions contemplated
by this Agreement other than an action or proceeding instituted or threatened by
Guilford.

              (e)    COMPANY CERTIFICATE. The Company shall have delivered to
Guilford a certificate, dated as of the First Closing Date and executed by the
President of the Company, certifying to the fulfillment of the conditions
specified in SECTIONS 6.1.(a) through 6.1.(d).

       6.2.   ADDITIONAL CLOSINGS

              The obligations of Guilford under this Agreement to purchase the
shares of Common Stock to be purchased by it at each Additional Closing Date are
subject to the fulfillment, at or prior to the respective Closing, of each of
the following conditions, and failure to satisfy any such condition shall excuse
and discharge all obligations of Guilford to pay that portion of the Milestone
payment which was to have been paid in consideration for Common Stock as
provided in the License Agreement, and to purchase the shares at the respective
Additional Closing, unless such failure is agreed to in writing by each
Guilford.

              (a)    OFFICERS' CERTIFICATES. The President of the Company shall
have delivered a certificate to Guilford with respect to the matters referred to
in SECTION 2.2 and certifying fulfillment of the conditions specified in
SECTIONS 6.2(b) through 6.2(d).

              (b)    LEGAL PROCEEDINGS. No action or proceeding by or before any
governmental authority shall have been instituted or, to the Company's
knowledge, threatened (and not subsequently dismissed, settled or otherwise
terminated) which is reasonably expected to restrain, prohibit or invalidate the
purchase of shares at such Additional Closing, other than an action or
proceeding instituted or threatened by Guilford.

              (c)    REPRESENTATIONS AND WARRANTIES. The representations and
warranties made by the Company in this Agreement and the statements contained in
the Disclosure Schedule and Exhibits attached hereto or in any Document
Furnished by the Company pursuant to this Agreement shall be true and complete
in all material respects when made, and as updated by an Additional Disclosure
Schedule, on and as of the Additional Closing Date, as though such
representations and warranties were made on and as of such date, except for any
changes occurring

                                      -20-
<PAGE>   56

in the Ordinary Course of Business and not material to the Company or disclosed
to and approved by Guilford and as otherwise expressly permitted by this
Agreement.

              (d)    PERFORMANCE. The Company shall have performed and complied
in all material respects with all Agreements and conditions required by this
Agreement to be performed or complied with prior to the Additional Closing Date.

7.     CONDITIONS PRECEDENT TO OBLIGATIONS OF THE COMPANY

       7.1.   FIRST CLOSING

              The obligations of the Company under this Agreement to issue the
shares of Common Stock to be issued by it at the First Closing are subject to
the fulfillment, at or prior to the First Closing, of each of the following
conditions, and failure to satisfy any such condition shall excuse and discharge
all obligations of the Company to issue the shares at the First Closing, unless
such failure is agreed to in writing by the Company.

              (a)    Representations and Warranties. The representations and
warranties made by Guilford in SECTION 5.2, and SECTIONS 5.4 through 5.7 of this
Agreement shall be true and complete in all material respects when made, and, on
and as of the First Closing Date, as though such representations and warranties
were made on and as of such date, except for any changes occurring in the
Ordinary Course of Business and not material to Guilford or as otherwise
expressly permitted by this Agreement.

              (b)    Officer's Certificate. Guilford shall have delivered to the
Company a certificate, dated as of the First Closing Date and executed by the
Chief Executive Officer of Guilford, certifying to the fulfillment of the
condition specified in SECTION 7.1(a).

       7.2.   ADDITIONAL CLOSINGS

              The obligations of the Company under this Agreement to issue the
shares of Common Stock to be issued by it at each Additional Closing Date are
subject to the fulfillment, at or prior to the respective Closing, of each of
the following conditions:

              (a)    Officer's Certificate. Guilford shall have delivered to the
Company a certified, dated as of the Additional Closing Date and executed by the
Chief Executive Officer of Guilford, certifying to the fulfillment of the
condition specified in SECTION 7.2(b).

                                      -21-
<PAGE>   57

              (b)    Representations and Warranties. The representations and
warranties made by Guilford in SECTION 5.2, and SECTIONS 5.4 through 5.7 of this
Agreement shall be true and complete in all material respects when made, and, on
and as of the First Closing Date, as though such representations and warranties
were made on and as of such date, except for any changes occurring in the
Ordinary Course of Business and not material to Guilford or as otherwise
expressly permitted by this Agreement.

8.     CLOSING

              Subject to the terms and conditions of this Agreement, each
Closing and Additional Closing shall take place at such time and place as are
mutually agreed upon by Guilford and ProQuest.

9.     SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION; REMEDIES

       9.1.   SURVIVAL OF REPRESENTATIONS

              All representations, warranties, covenants, indemnities and other
Agreements made by any party to this Agreement herein or pursuant hereto shall
also be deemed made on and as of the First Closing Date and each Additional
Closing Date as though such representations, warranties, covenants, indemnities
and other Agreements were made on and as of such date (as they are superseded or
updated by Disclosure Schedules as of such date), and all such representations,
warranties, covenants, indemnities and other Agreements shall survive the First
Closing and each Additional Closing and any investigation, audit or inspection
at any time made by or on behalf of any party hereto, provided, however, that
the representations and warranties in SECTIONS 4.3, 4.4 and 4.5 shall only
survive for a period of two (2) years beyond the closing at which they were
made.

       9.2.   INDEMNIFICATION

              (a)    The Company, from and after the date hereof, shall
indemnify and hold the Guilford Indemnified Parties harmless from and against
any damages, losses, deficiencies, costs, expenses, obligations, fines,
expenditures, claims and liabilities, including reasonable counsel fees and
reasonable expenses of investigation, defending and prosecuting litigation or
arbitration (collectively, the "Damages"), suffered by the Guilford Indemnified
Parties as a result of, caused by, arising out of, or in any way relating to the
breach of any representation or warranty made in this Agreement or in any list,
schedule, certificate, or other instrument furnished or to be furnished to
Guilford by the Company pursuant to the terms of this Agreement.

                                      -22-
<PAGE>   58

              (b)    Guilford, from and after the date hereof, shall indemnify
and hold the Company Indemnified Parties harmless from and against any damages,
losses, deficiencies, costs, expenses, obligations, fines, expenditures, claims
and liabilities, including reasonable counsel fees and reasonable expenses of
investigation, defending and prosecuting litigation or arbitration
(collectively, the "Damages"), suffered by the Company Indemnified Parties as a
result of, caused by, arising out of, or in any way relating to the breach of
any representation or warranty made in this Agreement.

              (c)    Neither the Company nor Guilford (each an "indemnifying
party") shall have any liability for any damages until the total of all damages
exceeds $5,000, in which case the indemnifying party shall be liable for any and
all Damages in an amount not exceeding the aggregate consideration paid by
Guilford in all closings hereunder, provided, however, that there shall be no
limit on the amount of Damages which may be recovered (i) for any breach by the
Company of the representations and warranties made in SECTIONS 4.1, 4.2, 4.7,
4.8 and 4.9, (ii) for any breach by Guilford of the representations and
warranties made in SECTIONS 5.4 through 5.7, and (iii) for any intentional or
deliberate misrepresentation, inaccuracy or breach of any representation or
warranty.

       9.3.   SPECIFIC PERFORMANCE

              In addition to any other remedies which Guilford may have at law
or in equity, the Company hereby acknowledges that the Common Stock is unique,
and that the harm to Guilford resulting from breaches by the Company of its
obligations cannot be adequately compensated by damages. Accordingly, the
Company agrees that Guilford shall have the right to have all obligations,
undertakings, Agreements, covenants and other provisions of this Agreement
specifically performed by the Company, as the case may be, and that Guilford
shall have the right to obtain an order or decree of such specific performance
in any of the courts of the United States of America or of any state or other
political subdivision thereof.

       9.4.   REMEDIES CUMULATIVE

              The remedies provided herein shall be cumulative and shall not
preclude the assertion by any party of any other rights or the seeking of any
other remedies against the other, or their respective successors or assigns.

10.    TRANSFER RESTRICTIONS

              (a)    Guilford may not transfer shares of Common Stock unless it
complies with the provisions of this Section 9. If Guilford receives a bona fide
unconditional offer (the "Offer") to Transfer all or any portion of its Common
Stock,

                                      -23-
<PAGE>   59

Guilford must promptly notify in writing (the "Original Notice") the Company of
its desire to transfer the Common Stock. The Company shall have the option to
purchase, upon the same terms and conditions listed in the Offer, the total
amount of the Common Stock to be Transferred within thirty (30) days of
receiving the Original Notice. To exercise its right to purchase the Common
Stock, the Company must send written notice of its intent to Guilford within ten
(10) days after receiving the Original Notice and purchase the Common Stock
within thirty (30) days of receiving the Original Notice. If the Company does
not give notice within the aforementioned ten (10) day period, then Guilford
shall be at liberty to sell the Common Stock upon the same terms and conditions
listed in the Offer, to the Person who made the Offer, within ninety (90) days
after the Original Notice.

              (b)    If any Person or group of Persons (collectively, the
"Transfer Group") proposes to transfer any shares of Common Stock in a single
transaction or series of related transactions, to any third-party offeror (the
"Offeror") for cash at a price per share greater than the highest price paid by
Guilford for any shares purchased pursuant to this Agreement, and if as a result
of such transfer or transfers more than fifty percent (50%) of the outstanding
Common Stock would be owned by the Offeror, then the Transfer Group must permit
Guilford to sell to the Offeror, on the same terms and conditions as offered to
the Transfer Group, all of the Common Stock held by Guilford. If Guilford does
not elect to sell to the Offeror, then following the Closing of the Offeror's
purchase of shares from the Transfer Group, at the option of the Offeror,
Guilford shall be required to sell it Common Stock to the Offeror at the same
prices and on the same terms and conditions, meeting the conditions set forth in
the preceding sentence, as offered to the Transfer Group. This provision will
not be construed so as to place restrictions on the Company's right to merge,
reorganize or consolidate as set forth in SECTION 11.4.

              (c)    The rights and obligations of this Article 10 shall
terminate and be of no further effect upon the earlier to occur of (i) the
Company's initial public offering of Common Stock and (ii) with respect to any
share of Common Stock, the transfer by Guilford of that share of Common Stock in
accordance with the terms of this Agreement.

11.    MISCELLANEOUS

       11.1.  ADDITIONAL ACTIONS AND DOCUMENTS

              Each of the parties hereto hereby agrees to take or cause to be
taken such further actions, to execute, deliver and file or cause to be
executed, delivered and filed such further Documents, and will obtain such
consents, as may be necessary or as may be reasonably requested in order to
fully effectuate the purposes, terms and conditions of this Agreement.

                                      -24-
<PAGE>   60

       11.2.  NO BROKERS

              Each of the parties hereto represents and warrants to the other
party that such party has not engaged any broker, finder or agent in connection
with the transactions contemplated by this Agreement and has not incurred (and
will not incur) any unpaid liability to any broker, finder or agent for any
brokerage fees, finders' fees or commissions, with respect to the transactions
contemplated by this Agreement. Each party agrees to indemnify, defend and hold
harmless each of the other parties from and against any and all claims asserted
against such parties for any such fees or commissions by any persons purporting
to act or to have acted for or on behalf of the indemnifying party.

       11.3.  EXPENSES

              Subject to the provisions of SECTION 9 and SECTIONS 2.3(b) and
3.1(b), each party hereto shall pay its own expenses incident to this Purchase
Agreement and the transactions contemplated hereunder, including all legal and
accounting fees and disbursements.

       11.4.  ASSIGNMENT

              Neither Guilford nor the Company shall assign its rights and
obligations under this Agreement, in whole or in part, without the prior written
consent of the other parties hereto, which consent shall not be unreasonably
withheld. Any such assignment contrary to the terms hereof shall be null and
void and of no force and effect. In no event shall the assignment by the Company
or Guilford of its respective rights or obligations under this Agreement,
whether before or after the Closing, release the Company or Guilford from its
liabilities and obligations hereunder; provided, however, that nothing herein
shall be construed to prevent the Company from consolidating, merging or
reorganizing with any other entity (whether or not the Company is the surviving
entity).

       11.5.  ENTIRE AGREEMENT; AMENDMENT

              This Agreement, including the Disclosure Schedule, the Exhibits
and other Documents referred to herein or Furnished pursuant hereto, constitutes
the entire Agreement among the parties hereto with respect to the transactions
contemplated herein, and it supersedes all prior oral or written Agreements,
commitments or understandings with respect to the matters provided for herein.
No amendment or modification of this Agreement shall be valid or binding unless
set forth in writing and duly executed and delivered by the Company and
Guilford.

                                      -25-
<PAGE>   61

       11.6.  WAIVER

              No delay or failure on the part of any party hereto in exercising
any right, power or privilege under this Agreement or under any other Documents
Furnished in connection with or pursuant to this Agreement shall impair any such
right, power or privilege or be construed as a waiver of any default or any
acquiescence therein. No single or partial exercise of any such right, power or
privilege shall preclude the further exercise of such right, power or privilege,
or the exercise of any other right, power or privilege. No waiver shall be valid
against any party hereto unless made in writing and signed by the party against
whom enforcement of such waiver is sought and then only to the extent expressly
specified therein.

       11.7.  DISPUTE RESOLUTION

              Guilford and the Company agree that the dispute resolution
provisions set forth in Article 12 of the License Agreement are incorporated by
reference herein and shall be binding upon the parties hereto as if such Article
12 was set forth in its entirety herein.

       11.8.  SEVERABILITY

              If any part of any provision of this Agreement or any other
Agreement or document given pursuant to or in connection with this Agreement
shall be invalid or unenforceable in any respect, such part shall be ineffective
to the extent of such invalidity or unenforceability only, without in any way
affecting the remaining parts of such provision or the remaining provisions of
this Agreement.

       11.9.  GOVERNING LAW; JURISDICTION

              For the purposes of this Agreement, the parties acknowledge their
diversity (Company being a Kansas corporation having its principal place of
business in Kansas and Guilford being a Delaware corporation having its
principal place of business in Maryland) and agree that this Agreement shall be
governed by and interpreted in accordance with the substantive laws of the State
of Delaware (without regard to conflict of law principles) and the parties
hereby accept and submit to the exclusive jurisdiction of the Federal District
Court located in Kansas or the state courts of general jurisdiction in Kansas
for purposes of enforcing any this Agreement including any arbitral award
hereunder.

                                      -26-
<PAGE>   62

       11.10. NOTICES

              All notices, demands, requests, or other communications which may
be or are required to be given, served, or sent by any party to any other party
pursuant to this Agreement shall be in writing and shall be hand delivered, sent
by overnight courier or mailed by first-class, registered or certified mail,
return receipt requested, postage prepaid, or transmitted by telegram, telecopy
or telex, addressed as follows:

              (i)    If to Guilford:

                     Guilford Pharmaceuticals Inc.
                     6611 Tributary Street
                     Baltimore, Maryland  21224
                     Attention: Secretary
                     Telecopier: (410) 631-6819

              in each case with a copy to (which shall not constitute notice)
              to:

                     Hogan & Hartson L.L.P.
                     111 South Calvert Street, Suite 1600
                     Baltimore, Maryland  21202
                     Attention: Michael J. Silver
                     Telecopier: (410) 539-6981

              (ii)   If to the Company:

                     ProQuest Pharmaceuticals, Inc.
                     1617 St. Andrews Drive
                     Lawrence, Kansas  66047
                     Attention: President
                     Telecopier: (785) 832-8234

              with a copy (which shall not constitute notice) to:

                     Shook, Hardy & Bacon L.L.P.
                     1010 Grand Blvd.  5th Floor
                     P.O. Box 15607
                     Kansas City, Missouri  64106-0607
                     Attention: John W. Simpson
                     Telecopier: (816) 842-3190

              Each party may designate by notice in writing a new address to
which any notice, demand, request or communication may thereafter be so given,
served or sent. Each notice, demand, request, or communication which shall be
hand

                                      -27-
<PAGE>   63

delivered, sent, mailed, telecopied or telexed in the manner described above, or
which shall be delivered to a telegraph company, shall be deemed sufficiently
given, served, sent, received or delivered for all purposes at such time as it
is delivered to the addressee (with the return receipt, the delivery receipt, or
(with respect to a telecopy or telex) the answerback being deemed conclusive,
but not exclusive, evidence of such delivery) or at such time as delivery is
refused by the addressee upon presentation.

       11.11. HEADINGS

              Section headings contained in this Agreement are inserted for
convenience of reference only, shall not be deemed to be a part of this
Agreement for any purpose, and shall not in any way define or affect the
meaning, construction or scope of any of the provisions hereof.

       11.12. LIMITATION ON BENEFITS

              The covenants, undertakings and agreements set forth in this
Agreement shall be solely for the benefit of, and shall be enforceable only by,
the parties hereto and their respective successors, heirs, executors,
administrators, legal representatives and permitted assigns, except that the
agreements set forth in SECTION 9 also shall be for the benefit of, and
enforceable by the indemnified parties thereunder and their respective
successors, heirs, executors, administrators, legal representatives or permitted
assigns.

       11.13. BINDING EFFECT

              Subject to any provisions hereof restricting assignment, this
Agreement shall be binding upon and shall inure to the benefit of the parties
hereto and their respective successors, heirs, executors, administrators, legal
representatives and assigns.

                                      -28-
<PAGE>   64

              IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement, or have caused this Agreement to be duly executed on their behalf, as
of the day and year first above written.

                                          PROQUEST PHARMACEUTICALS, INC.

                                          By: /s/ Osborne S. Wong
                                              -------------------
                                          Name: Osborne S. Wong
                                          Title: President

                                          GUILFORD PHARMACEUTICALS INC.

                                          By: /s/ Thomas C. Seoh
                                              ------------------
                                          Name: Thomas C. Seoh
                                          Title: Senior Vice President, General
                                                 Counsel and Secretary

                                      -29-
<PAGE>   65

                                    EXHIBIT A
                           TO STOCK PURCHASE AGREEMENT
                            DATED AS OF MARCH 2, 2000

                                   DEFINITIONS

              "ADDITIONAL CLOSING" shall mean each Closing after the First
Closing.

              "AFFILIATE" means: (a) with respect to a person, any member of
such person's family; (b) with respect to an entity, any officer, director,
stockholder, partner or Guilford of or in such entity or of or in any Affiliate
of such entity; and (c) with respect to a person or entity, any person or entity
which directly or indirectly, through one or more intermediaries, Controls, is
Controlled by, or is under common Control with such person or entity.

              "AGREEMENT" means any concurrence of understanding and intention
between two or more persons (or entities) with respect to their relative rights
and/or obligations or with respect to a thing done or to be done (whether or not
conditional, executory, express, implied, in writing or meeting the requirements
of contract), including, without limitation, contracts, leases, promissory
notes, covenants, easements, rights of way, covenants, commitments, arrangements
and understandings.

              "ASSETS" means assets of every kind and everything that is or may
be available for the payment of liabilities (whether inchoate, tangible or
intangible), including, without limitation, real and personal property.

              "CLAIMS" means all demands, claims, actions or causes of action,
assessments, losses, damages (including, without limitation, diminution in
value), liabilities, costs and expenses, including, without limitation,
interest, penalties and reasonable attorneys' fees and disbursements.

              "CLOSING" means each closing of the sale and purchase of shares of
Common Stock pursuant to the Agreement.

              "CLOSING DATE" means 10:00 a.m. local time on the date of each
Closing as contemplated hereby or such other time and date as shall be mutually
agreed upon by the Company and Guilford.

              "COMMON STOCK" shall mean the common stock of the Company, $0.001
par value per share.

<PAGE>   66

              "COMPANY" means ProQuest Pharmaceuticals, Inc., a Kansas
corporation.

              "COMPANY INDEMNIFIED PARTIES" means the Company and its
Affiliates, employees, representatives, agents, officers and directors.

              "CONTROL" means possession, directly or indirectly, of power to
direct or cause the direction of management or policies (whether through
ownership of voting securities, by Agreement or otherwise).

              "DISCLOSURE SCHEDULE" means the disclosure schedule identified as
the Disclosure Schedule to the Purchase Agreement.

              "DOCUMENTS" means any paper or other material (including, without
limitation, computer storage media) on which is recorded (by letters, numbers or
other marks) information that may be evidentially used, including, without
limitation, legal opinions, mortgages, indentures, notes, instruments, leases,
Agreements, insurance policies, reports, studies, financial statements
(including, without limitation, the notes thereto), other written financial
information, schedules, certificates, charts, maps, plans, photographs, letters,
memoranda and all similar materials.

              "ENCUMBRANCE" means any mortgage, lien, pledge, encumbrance,
security interest, deed of trust, option, encroachment, reservation, order,
decree, judgment, condition, restriction, charge, Agreement, claim or equity of
any kind.

              "ESCROW AGREEMENT" means the Escrow Agreement entered into by and
among the Company, Guilford, and the Escrow Agent dated March 2, 2000.

              "EXHIBIT" means an exhibit attached to the Agreement.

              "FIRST CLOSING" shall mean the Closing to occur no later than ten
(10) days following the Determination Date, being the First Closing Date.

              "FURNISHED" means supplied, delivered or provided in any way.

              "GUILFORD" means Guilford Pharmaceuticals Inc., a Delaware
corporation.

              "GUILFORD INDEMNIFIED PARTY" means Guilford and its Affiliates,
employees, representatives, agents, officers and directors.

              "LAWS" means all foreign, federal, state and local statutes, laws,
ordinances, regulations, rules, resolutions, orders, determinations, writs,
injunctions, awards (including, without limitation, awards of any arbitrator),
judgments and decrees applicable to the specified persons or entities and to the

                                      -2-
<PAGE>   67

businesses and Assets thereof (including, without limitation, Laws relating to
securities registration and regulation; the sale, leasing, ownership or
management of real property; employment practices, terms and conditions, and
wages and hours; building standards, land use and zoning; safety, health and
fire prevention; and environmental protection).

              "LICENSE AGREEMENT" means the License, Development, and
Commercialization Agreement by and between the Company and Guilford of even date
herewith for the compound known as PQ-1002 and certain related compounds.

              "MATERIAL ADVERSE AFFECT" means any material adverse effect on the
assets, properties, business, operations, prospects, condition (financial or
otherwise) or liabilities of the Company or its Affiliates, if any, taken as a
whole.

              "ORDINARY COURSE OF BUSINESS" means ordinary course of business
consistent with past practices and prudent business operations.

              "PERSON" means any individual, partnership, joint venture,
corporation, trust, unincorporated organization, government or department or
agency of a government.

              "SECTION" means a Section (or a subsection) of this Stock Purchase
Agreement.

              "SECURITIES ACT" means the Securities Act of 1933, as amended, and
all laws promulgated pursuant thereto or in connection therewith.

                                      -3-
<PAGE>   68

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
1. DEFINITIONS...............................................................2
2. SALE AND PURCHASE OF SHARES...............................................2
   2.1.   Sale and Purchase of Shares........................................2
   2.2.   Payments and Deliveries at the Closings............................2
   2.3.   Piggyback Registration Rights......................................4
   2.4.   Registration Procedures............................................4
   2.5.   Adjustment of Number of Shares Issued Upon Issuance of
          Common Stock.......................................................7
   2.6.   Repurchase Option..................................................10
3. ADDITIONAL UNDERTAKINGS AND COVENANTS.....................................11
   3.1.   Consents and Approvals.............................................11
   3.2.   Access of Guilford to Information..................................11
   3.3.   Confidentiality....................................................11
   3.4.   Amendments to the Company's Certificate of Incorporation...........12
   3.5.   News Releases......................................................13
   3.6.   Subsequent Events..................................................13
   3.7.   Change of Control..................................................13
4. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.............................14
   4.1.   Organization and Standing..........................................14
   4.2.   Capital Structure of the Company...................................14
   4.3.   Financial Statements...............................................15
   4.4.   No Liabilities.....................................................15
   4.5.   Conduct of Business; Absence of Material Adverse Change............16
   4.6.   Restrictions and Consents..........................................16
   4.7.   Authorization......................................................16
   4.8.   Absence of Violation...............................................16
   4.9.   Binding Obligation.................................................17
   4.10.  Disclosure.........................................................17
5. REPRESENTATIONS AND WARRANTIES OF GUILFORD................................17
   5.1.   Organization and Standing..........................................17
   5.2.   Authorization......................................................17
   5.3.   Binding Obligation.................................................18
   5.4.   No Registration Under the Securities Act...........................18
   5.5.   Acquisition for Investment.........................................18
   5.6.   Evaluation of Merits and Risks of Investment.......................18
   5.7.   Legends............................................................19
6. CONDITIONS PRECEDENT TO OBLIGATIONS OF GUILFORD...........................19
   6.1.   First Closing......................................................19
   6.2.   Additional Closings................................................20
7. CONDITIONS PRECEDENT TO OBLIGATIONS OF THE COMPANY........................21
</TABLE>

<PAGE>   69

<TABLE>
<S>                                                                          <C>
    7.1.   First Closing.....................................................21
    7.2.   Additional Closings...............................................21
8.  CLOSING..................................................................22
9.  SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION; REMEDIES...................22
    9.1.   Survival of Representations.......................................22
    9.2.   Indemnification...................................................22
    9.3.   Specific Performance..............................................23
    9.4.   Remedies Cumulative...............................................23
10. TRANSFER RESTRICTIONS....................................................23
11. MISCELLANEOUS............................................................24
    11.1.  Additional Actions and Documents..................................24
    11.2.  No Brokers........................................................25
    11.3.  Expenses..........................................................25
    11.4.  Assignment........................................................25
    11.5.  Entire Agreement; Amendment.......................................25
    11.6.  Waiver............................................................26
    11.7.  Dispute Resolution................................................26
    11.8.  Severability......................................................26
    11.9.  Governing Law; Jurisdiction.......................................26
    11.10. Notices...........................................................27
    11.11. Headings..........................................................28
    11.12. Limitation on Benefits............................................28
    11.13. Binding Effect....................................................28
</TABLE>

EXHIBIT A     DEFINITIONS
EXHIBIT B     LICENSE DEVELOPMENT AND COMMERCIALIZATION AGREEMENT

                                      -ii-
<PAGE>   70
                                                                       EXHIBIT B

                                Escrow Agreement

<PAGE>   71

                                ESCROW AGREEMENT

              THIS ESCROW AGREEMENT (this "Escrow Agreement") is entered into as
of March 2, 2000, by and among Guilford Pharmaceuticals Inc., a Delaware
corporation ("Guilford"), ProQuest Pharmaceuticals, Inc., a Kansas corporation
("ProQuest"), and First Union National Bank, a national banking association,
with a business address at 800 East Main Street, Corporate Trust, VA3279,
Richmond, Virginia 23219 as Escrow Agent (the "Escrow Agent").

                              W I T N E S S E T H:

              WHEREAS, Guilford and ProQuest have entered into a License,
Development, and Commercialization Agreement of even date herewith pursuant to
which Guilford, partly in consideration for the nonrefundable payment of
$500,000 and a contingent payment into escrow of an additional $500,000,
obtained a license of a compound referred to as PQ-1002 and certain related
compounds from ProQuest; and

              WHEREAS, Guilford and ProQuest desire that the Escrow Agent hold
in escrow the Deposit (as hereinafter defined) in accordance with the terms and
conditions hereinafter set forth, and the Escrow Agent has agreed to act as
Escrow Agent hereunder, in accordance with the terms and conditions hereinafter
set forth.

              NOW, THEREFORE, in consideration of the foregoing and of the
mutual covenants and agreements hereinafter set forth, the parties, intending to
be bound legally, agree as follows:

              Section 1.    Appointment of Escrow Agent. Guilford and ProQuest
hereby mutually appoint and designate the Escrow Agent to receive the Deposit
(as hereinafter defined) and to hold and deliver the Deposit and the interest
thereon as set forth herein.

              Section 2.    Escrow Deposit.

              2.1    Deposit. There is hereby established a separate escrow
account with the Escrow Agent in which Guilford, simultaneously with the
execution of this Escrow Agreement, is depositing with the Escrow Agent Five
Hundred Thousand Dollars ($500,000) in cash (the "Deposit"), to be held and
disbursed by the Escrow Agent as hereinafter set forth.

              2.2    Receipt. The Escrow Agent hereby acknowledges receipt of
and accepts the Deposit in escrow and agrees to hold and keep same in

<PAGE>   72

accordance with the terms and conditions hereof and for the uses and purposes
stated herein.

              2.3    Investment. The Escrow Agent shall invest the Escrow
Deposit in an interest-bearing bank account at Fidelity Treasury Money Market
Fund (the "Depository"). All income earned on the Deposit ("Interest") shall be
disbursed in the manner set forth in Section 3 below.

              Section 3.    Procedures for Disbursement. The Escrow Agent shall
hold the Deposit for the exclusive benefit of Guilford and ProQuest, as provided
in this Escrow Agreement, and shall disburse the Deposit to Guilford and/or
ProQuest only in accordance with the following terms and conditions:

              3(a)   Upon receipt by the Escrow Agent of a written instruction
signed by or on behalf of Guilford stating that Guilford desires to proceed with
the development and commercialization of an Agreement Compound in accordance
with the License, Development, and Commercialization Agreement, the Escrow Agent
shall deliver the Deposit (and the Interest) to ProQuest upon the closing of the
purchase of ProQuest common stock by Guilford as contemplated in the License,
Development, and Commercialization Agreement.

              3(b)   Upon receipt by the Escrow Agent of a written instruction
signed by or on behalf of Guilford stating that Guilford does not desire to
proceed with the development and commercialization of an Agreement Compound
under the License, Development, and Commercialization Agreement, the Escrow
Agent shall deliver the Deposit to Guilford and the Interest to ProQuest.

              3(c)   Guilford and ProQuest each agree to use their best efforts,
in good faith, to agree and to jointly certify to and instruct the Escrow Agent
on a timely basis as to any disbursement contemplated by this Escrow Agreement.
If by September 1, 2000, the Escrow Agent has not received any written
instructions or other documents specified in Section 3 directing the release of
the Deposit to one of the parties hereto, the Escrow Agent shall deliver the
Deposit, plus Interest, to ProQuest, whereupon the Escrow Agent shall be
relieved of any further obligation pursuant hereto.

              3(e)   Upon disbursement of the Deposit (and Interest) in
accordance with this Section 3, the Escrow Agent shall be discharged from all
obligations under this Escrow Agreement and shall have no further duties or
responsibilities in connection herewith.

              Section 4.    Escrow Agent.

              4.1    Duties. The Escrow Agent undertakes only to accept, hold
and disburse the Deposit in accordance with the provisions of this Escrow

                                      -2-
<PAGE>   73

Agreement. The Escrow Agent shall not be under any duty to give the Deposit (and
Interest) any greater degree of care than it gives its own similar property.

              4.2    Fees and Expenses. Guilford shall pay all of the Escrow
Agent's standard charges for professional services and its other charges in
connection with the Escrow Agent's service under this Agreement.

              4.3    Indemnification. Except with respect to claims based upon
gross negligence or willful misconduct that are successfully asserted against
the Escrow Agent, Guilford and ProQuest shall jointly and severally indemnify
and hold harmless the Escrow Agent (and any successor to the Escrow Agent) from
and against any and all costs, losses, claims, damages, liabilities and expenses
(including reasonable costs of investigation, court costs and attorney's fees
and related other charges) which may be imposed upon or incurred by the Escrow
Agent in connection with its service as Escrow Agent hereunder, including any
litigation arising from this Escrow Agreement or involving the subject matter
hereof. In the event that Guilford or ProQuest is required to indemnify and hold
harmless the Escrow Agent pursuant to this Escrow Agreement, Guilford or
ProQuest, as the case may be, shall have the right to seek contribution from the
other party hereto (other than the Escrow Agent) for amounts paid or payable in
respect of such indemnity in such proportion as appropriately reflects such
party's relative fault.

              4.4    Ambiguity or Dispute. If the Escrow Agent is uncertain as
to its duties and rights hereunder, or if any objections are received with
respect to actions proposed to be taken by the Escrow Agent under Section 3, or
in the event of any other dispute between or conflicting claims by or among
Guilford and ProQuest and/or any other person or entity with respect to the
Deposit and Interest the Escrow Agent shall be entitled, at its sole option, to
refuse to comply with any demands, claims or instructions and to refrain from
taking any action other than to keep all property held by it in escrow until the
Escrow Agent is directed otherwise in joint written instructions signed by the
parties hereto or by a judgment by a court of competent jurisdiction, and the
Escrow Agent is authorized to deposit the Deposit and Interest with, or commence
an interpleader action in, any court of competent jurisdiction, whereupon the
Escrow Agent shall be relieved of any further obligation pursuant hereto. The
Escrow Agent shall not be or become liable in any way for actions taken in
accordance with this Section 4.4.

              4.5    Resignation. The Escrow Agent reserves the right to resign
as Escrow Agent at any time, provided ten days' prior written notice is given to
the other parties hereto. The other parties hereto reserve the right to remove
the Escrow Agent by joint written notice at any time, provided that such notice
is given to the Escrow Agent at least ten days prior to the effectiveness of
such removal.

                                      -3-
<PAGE>   74

              Section 5.    Liabilities of Escrow Agent.

              5.1    Limitations on Escrow Agent's Responsibility and Liability.

                     5.1(a) The Escrow Agent does not have any interest in the
Deposit and Interest but is serving as escrow holder only, having only
possession thereof. The Escrow Agent makes no representation as to the validity,
value, genuineness or sufficiency of the Deposit. The Escrow Agent shall not be
called upon to advise any party as to selling or retaining, or taking or
refraining from taking any action with respect to, any securities or other
property deposited hereunder.

                     5.1(b) The Escrow Agent shall be under no duty to accept
instructions from any person other than Guilford or ProQuest, and shall only
accept such instructions to the extent and in the manner provided in this Escrow
Agreement.

                     5.1(c) The Escrow Agent shall be permitted to consult with
counsel of its choice and shall not be liable for any action taken, suffered, or
omitted by it in good faith in accordance with the advice of such counsel.

                     5.1(d) The Escrow Agent shall not be liable, except for its
own gross negligence or willful misconduct, and, except with respect to claims
based upon such gross negligence or willful misconduct that are successfully
asserted against the Escrow Agent, the other parties hereto shall jointly and
severally indemnify and hold harmless the Escrow Agent (and any successor to the
Escrow Agent) as provided in Section 4.3. Without limiting the foregoing, the
Escrow Agent shall in no event be liable in connection with its investment or
reinvestment of any cash held by it hereunder in good faith, in accordance with
the terms hereof, including without limitation any liability for any delays (not
resulting from its own gross negligence or willful misconduct) in the investment
or reinvestment of the Deposit and Interest, or any loss of interest incident to
any such delays.

                     5.1(e) The Escrow Agent shall not be liable for loss or
damage resulting from any good faith act or forbearance of the Escrow Agent, any
default, error, action or omission of any party other than the Escrow Agent, any
delay that is not caused by the Escrow Agent, the Escrow Agent's assertion or
failure to assert any cause of action or defense in any judicial or
administrative proceeding, or any loss or damage that arises after the Deposit
and Interest has been disbursed in accordance with the terms of this Escrow
Agreement.

              5.2    Reliance. The Escrow Agent shall be entitled to rely upon
any order, judgment, certification, instruction, notice or other writing
delivered to it

                                      -4-
<PAGE>   75

in compliance with the provisions of this Agreement without being required to
determine the authenticity or the correctness of any fact stated therein or the
propriety or validity thereof. The Escrow Agent may act in reliance upon any
instrument comporting with the provisions of this Escrow Agreement or signature
believed by it to be genuine, and may assume that any person purporting to give
notice or receipt or advice or to make any statement or to execute any document
in connection with the provisions hereof has been duly authorized to do so.

                     At any time the Escrow Agent may request a joint
instruction in writing from Guilford and ProQuest, and may at its own option
include in such request the course of action it proposes to take and the date on
which it proposes to act, regarding any matter arising in connection with its
duties and obligations hereunder. The Escrow Agent shall have no liability
relating to or arising out of action taken with the consent of Guilford and
ProQuest in accordance with such a joint instruction. In addition, if the Escrow
Agent requests a joint instruction and then takes action on or after the date
specified such joint instruction for action by the Escrow Agent, the Escrow
Agent shall have no liability relating to or arising out of such action,
provided that the specified date shall be at least five business days after
Guilford and ProQuest receive the Escrow Agent's request for instructions and
its proposed course of action, and provided further that, prior to so acting,
the Escrow Agent has not received a written objection by Guilford or ProQuest to
the instruction requested by the Escrow Agent.

              5.3    No Implied Duties; Collateral Agreements. The Escrow Agent
shall not be obligated to perform any duties that are not expressly set forth in
this Escrow Agreement, and no implied covenants or obligations shall be inferred
from this Escrow Agreement against the Escrow Agent. The Escrow Agent shall not
be bound in any way by any contract or agreement between Guilford and ProQuest
or among Guilford, ProQuest and any other parties, whether or not the Escrow
Agent has knowledge of any such contract or agreement or of its terms or
conditions.

              Section 6.    Termination. This Escrow Agreement shall be
terminated upon the disbursement by the Escrow Agent of the Deposit (and
Interest). This Escrow Agreement also may be terminated by written mutual
consent signed by all parties. This Escrow Agreement shall not be otherwise
terminated. The obligations and liabilities of the Escrow Agent hereunder will
terminate on termination of this Escrow Agreement or such earlier date as may be
provided herein. Irrespective of the date on which the obligations and
liabilities of the Escrow Agent hereunder shall be terminated, the rights of the
Escrow Agent and the obligations of Guilford and ProQuest under Sections 4.2 and
4.3 shall survive notwithstanding termination of this Agreement or the
resignation of the Escrow Agent.

                                      -5-
<PAGE>   76

              Section 7.    Other Provisions.

              7.1    Notices. All notices, demands, requests, or other
communications which may be or are required to be given, served, or sent by any
party to any other party pursuant to this Agreement shall be in writing and
shall be mailed by first-class, registered or certified mail, return receipt
requested, postage prepaid, or transmitted by hand delivery (including delivery
by courier), telegram, telex, or facsimile transmission, addressed as follows:

              (a)    To Guilford:

                     Guilford Pharmaceuticals Inc.
                     6611 Tributary Street
                     Baltimore, Maryland  21224
                     Attention:  Secretary
                     Facsimile No.:  410/631-6819

              in each case with a copy to (which shall not constitute notice)
              to:

                     Hogan & Hartson L.L.P.
                     111 South Calvert Street, Suite 1600
                     Baltimore, Maryland  21202
                     Attention:  Michael J. Silver
                     Facsimile No.:  410/539-6981

                     To ProQuest:

                     ProQuest Pharmaceuticals, Inc.
                     1617 St. Andrews Drive
                     Lawrence, Kansas  66047
                     Attention:  President
                     Facsimile No.:785/832-8234

              with a copy (which shall not constitute notice) to:

                     Shook Hardy & Bacon, L.L.P.
                     1010 Grand Boulevard., 5th Floor
                     P.O. Box 15607
                     Kansas City, MO 64106-0607
                     Attention:  John W. Simpson
                     Facsimile No.: 816/842-3190

                     To the Escrow Agent:

                     First Union National Bank
                     800 East Main Street

                                      -6-
<PAGE>   77

                     VA3279
                     Richmond, VA 23219
                     Attention:  Kelly A. Pickerel
                     Facsimile No.: 804/343-6699

Each party may designate by notice in writing a new address to which any notice,
demand, request or communication may thereafter be so given, served or sent.
Each notice, demand, request, or communication which shall be mailed, delivered
or transmitted in the manner described above shall be deemed sufficiently given,
served, sent and received for all purposes at such time as it is delivered to
the addressee (with the return receipt, the delivery receipt, the affidavit of
messenger or (with respect to a telex) the answerback being deemed conclusive
(but not exclusive) evidence of such delivery) or at such time as delivery is
refused by the addressee upon presentation.

              7.2    Benefit and Assignment. This Escrow Agreement shall be
binding upon and shall inure to the benefit of the parties hereto and their
respective successors and assigns as permitted hereunder. No person or entity
other than the parties hereto is or shall be entitled to bring any action to
enforce any provision of this Escrow Agreement against any of the parties
hereto, and the covenants and agreements set forth in this Escrow Agreement
shall be solely for the benefit of, and shall be enforceable only by, the
parties hereto or their respective successors and assigns as permitted
hereunder. No party to this Escrow Agreement may assign this Escrow Agreement or
any rights hereunder without the prior written consent of the other parties
hereto.

              7.3    Entire Agreement; Amendment. This Escrow Agreement contains
all the terms agreed upon by the parties with respect to the escrow arrangement
that is the subject matter hereof and supersedes all prior oral or written
agreements, commitments or understandings with respect to such matters. This
Escrow Agreement may be amended only by a written instrument signed by the party
against whom enforcement of any waiver, change, modification, extension or
discharge is sought.

              7.4    Additional Actions and Documents. Each of the parties
hereto hereby agrees to take or cause to be taken such further actions, to
execute, deliver and file or cause to be executed, delivered and filed such
further documents and instruments, and to use best efforts to obtain such
consents, as may be necessary or as may be reasonably requested in order to
fully effectuate the purposes, terms and conditions of this Escrow Agreement.

              7.5    Headings. The headings of the sections and subsections of
this Escrow Agreement are for purposes of reference only and do not evidence the
intentions of the parties.

                                      -7-
<PAGE>   78

              7.6    Severability. In the event that a court of competent
jurisdiction holds that a particular provision or requirement of this Escrow
Agreement is in violation of any applicable law, each such provision or
requirement shall be enforced only to the extent it is not in violation of such
law or is not otherwise unenforceable, and all other provisions and requirements
of this Escrow Agreement shall remain in full force and effect.

              7.7    Force Majeure. No party shall be held responsible for any
delay or failure in performance under this Escrow Agreement arising out of a
cause beyond its control or without its fault or negligence. Such causes may
include, but are not limited to, fires, floods, strikes or other labor problems,
embargoes, acts of God (including, without limitation, weather conditions),
national disasters, restrictions access to the Escrow Agent's offices or
facilities imposed by third parties, failures of couriers or the postal system
to make timely deliveries, failures of banks or other parties to transmit funds,
acts of regulatory agencies, or failures of third parties to perform
obligations.

              7.8    Governing Law. This Escrow Agreement shall be governed by,
and construed according to, the laws of the Commonwealth of Virginia (without
regard to the choice of law provisions thereof).

              7.9    Counterparts. To facilitate execution, this Agreement may
be executed in as many counterparts as may be required; and it shall not be
necessary that the signatures of, or on behalf of, each party, or that the
signatures of all persons required to bind any party, appear on each
counterpart; but it shall be sufficient that the signature of, or on behalf of,
each party, or that the signatures of the persons required to bind any party,
appear on one or more of the counterparts. All counterparts shall collectively
constitute a single agreement. It shall not be necessary in making proof of this
Agreement to produce or account for more than a number of counterparts
containing the respective signatures of, or on behalf of, all of the parties
hereto. This Agreement may be executed and delivered by each party through the
use of facsimile transmission of signature pages that contain the signatures on
behalf of such party to each of the other parties hereto at their respective
facsimile numbers set forth in Section 7.1 hereof or at such other facsimile
numbers as such other parties may request, and each such faxed signature page
shall constitute an executed counterpart of this Agreement.

                                      -8-
<PAGE>   79

              IN WITNESS WHEREOF, the parties hereto have executed this Escrow
Agreement as of the date set forth above.

                              GUILFORD PHARMACEUTICALS INC.

                              By: /s/ Thomas C. Seoh
                                  ------------------
                              Name: Thomas C. Seoh
                              Title: Senior Vice President, General Counsel and
                                     Secretary

                              PROQUEST PHARMACEUTICALS, INC.

                              By: /s/ Osborne S. Wong
                                  -------------------
                              Name: Osborne S. Wong
                              Title: President

                              FIRST UNION NATIONAL BANK, AS ESCROW AGENT

                              By: /s/ Monique Green
                                  -----------------
                              Name: Monique L. Green
                              Title: Authorized Officer

                                      -9-
<PAGE>   80
                                                                       EXHIBIT C

                              Consent and Agreement

<PAGE>   81
                              CONSENT AND AGREEMENT

       THIS CONSENT AND AGREEMENT ("Agreement") is entered into and shall be
effective March 2, 2000 ("Effective Date") among Guilford Pharmaceuticals Inc.,
a Delaware corporation having a principal place of business at 6611 Tributary
Street, Baltimore, Maryland 21224 ("Guilford"), ProQuest Pharmaceuticals, Inc.,
a Kansas corporation having a place of business at 4913 Stoneback Place,
Lawrence, Kansas 66047 ("ProQuest"), and The University of Kansas Center for
Research, Inc., a Kansas not-for-profit corporation, having a principal place of
business at Youngberg Hall, University of Kansas, Lawrence, Kansas 66044
("KUCR").

       WHEREAS, KUCR has an agreement with the University of Kansas wherein KUCR
manages certain licenses, equity and other technology transfer matters on behalf
of the University of Kansas;

       WHEREAS, KUCR granted to ProQuest a certain exclusive license under
Patent Rights and Know-How to develop, have developed, make, have made, use,
distribute for sale, have distributed for sale and sell or have sold Product
("ProQuest Rights");

       WHEREAS, "Patent and Rights," "Know-How" and "Product" as used herein
have the meanings set forth in the License Agreement between ProQuest and KUCR
dated April 2, 1999 ("KU License"), a copy of which is attached hereto and
incorporated herein by this reference as Exhibit A;

       WHEREAS, ProQuest has, of even date herewith, entered into a License,
Development and Commercialization Agreement with Guilford ("PQ License") a copy
of which is attached hereto and incorporated herein by this reference as Exhibit
B;

       WHEREAS, pursuant to the terms of the PQ License, ProQuest has licensed
to Guilford "ProQuest Patent Rights," "ProQuest Know-How," "Agreement
Compounds," and "Program Products" each as defined in the PQ License
(collectively, "License Grants");

       WHEREAS, the parties hereto wish to clarify and agree on their respective
rights and obligations with respect to the Patent Rights, the Know-How and the
License Grants;

       NOW, THEREFORE, for good and valuable consideration, the sufficiency and
receipt of which are hereby acknowledged, the parties agree as follows:

1.     CONSISTENT RIGHTS. KUCR agrees that Agreement Compounds and Program
Products are, to the extent applicable, included within "Product" for purposes
of the KU License. KUCR further agrees that all License Grants from ProQuest to
Guilford pursuant to the PQ License are, to the extent applicable, included
within the Patent Rights and Know-How licenses granted exclusively to ProQuest
under the KU License, subject to the terms thereof.

2.     CONSENT TO SUBLICENSE. KUCR consents to the terms of the PQ License,
including: (i) the sublicense of the Patent Rights and Know-How by ProQuest to
Guilford pursuant to the PQ License; and (ii) to the extent applicable, the
license, development and commercialization of Agreement Compounds and Program
Products by Guilford, provided that nothing herein shall be deemed to constitute
any endorsement by KUCR or the University of Kansas of the terms of the PQ
License.

3.     OBLIGATIONS OF LICENSEE UNDER KU LICENSE. The parties hereto acknowledge
that, as among the parties hereto, any obligations of "Licensee" (as that term
is defined in the KU License) under the KU License shall remain the obligations
of ProQuest, and shall not be obligations of Guilford, except pursuant to any
direct license from KUCR to Guilford as contemplated by Section 7

<PAGE>   82

below. Without limiting the generality of the foregoing, the parties hereto
acknowledge that, as among the parties hereto, any payment of royalties or other
fees associated with the licensing, development or commercialization of any
Product (including Agreement Compounds and Program Products) under the KU
License shall be made by ProQuest to KUCR pursuant to the terms of the KU
License. The parties agree that Guilford shall have no obligation to pay any
royalties, fees or other charges to KUCR for use of the Patent Rights and
Know-How under the terms of the PQ License, the KU License or this Consent and
Agreement, except pursuant to any direct license from KUCR to Guilford as
contemplated in Section 7 below.

4.     KUCR COOPERATION. During the term of the PQ License, KUCR agrees to
cooperate with ProQuest and/or Guilford in any dispute with a third party
involving the ownership of the Patent Rights and Know-How as set forth in the KU
License (insofar as they relate to the subject matter of the License Grants),
and use its good faith best efforts to try to ensure that the sublicense of the
Patent Rights and Know-How to Guilford, and the rights thereunder, under the PQ
License are not impaired or encumbered.

5.     FULL POWER AND AUTHORITY. KUCR represents and warrants that (i) it has
full power and authority to provide the consents herein, and to bind the
University of Kansas in respect of such consents; and (2) no further consents
are required relating to the subject matter of the PQ License and/or this
Consent and Agreement.

6.     NOTICES OF DEFAULT OR SURRENDER. During the term of this Consent and
Agreement, KUCR will: (i) simultaneously with the mailing of such to ProQuest,
provide to Guilford copies of any formal notice(s) of default sent to ProQuest
from KUCR stating that ProQuest is in material breach or default of any of the
terms of the KU License; and (ii) promptly notify Guilford in writing of any
surrender by ProQuest of any Patent Rights or Know-How under the KU License that
includes any ProQuest Patent Rights, ProQuest Know-How, Agreement Compounds or
Program Products.

7.     TERMINATION OR SURRENDER OF RIGHTS UNDER THE KU LICENSE. In the event of
any early termination of the KU License, prior to its expiration in accordance
with its terms, during the term of the PQ License, or any surrender by ProQuest
of Patent Rights or Know-How which covers ProQuest Patent Rights, ProQuest
Know-How, Agreement Compounds or Program Products, KUCR hereby grants to
Guilford an exclusive option to enter into a direct license agreement with
respect to the Patent Rights and Know-How insofar as they relate to Agreement
Compounds and Program Products on terms at least as favorable as those offered
to ProQuest under the KU License. The option shall be exercisable for sixty (60)
days following any termination of the KU License, whether such termination is
due to default of ProQuest or otherwise, or any surrender by ProQuest of Patent
Rights or Know-How which covers ProQuest Patent Rights, ProQuest Know-How,
Agreement Compounds or Program Products. As far as the PQ License is concerned,
this Section 7 shall be in lieu of Section 9.05 of the KU License.

8.     PROSECUTION AND ENFORCEMENT OF PATENT RIGHTS.

       a.     KUCR hereby confirms the rights of Guilford as "sublicensee" under
              Sections 8.01, 8.02 and 8.03 of the KU License.

       b.     In any Patent Prosecution (as defined in the PQ License) of
              ProQuest Patent Rights conducted by KUCR or the University of
              Kansas, KUCR shall (i) provide Guilford sufficient opportunity to
              review and comment in advance of any deadlines and any filings by
              KUCR of patent applications and patents and material
              communications to and from the U.S. Patent and Trademark Office
              and patent offices in foreign countries relating to such ProQuest
              Patent Rights; and (ii) obtain Guilford's consent (which consent
              shall not to be unreasonably withheld) in connection with material
              actions KUCR or the University of Kansas may take in the course of
              Patent Prosecution that would limit the

                                       2
<PAGE>   83

              scope of protection for Agreement Compounds. "Material actions" as
              used in this Consent and Agreement shall include: (1) the filing
              of new applications (including divisionals, continuations,
              continuations-in-part, reissues and reexaminations); (2) the
              filing of amendments; (3) the submission of responses to Official
              actions on the merits (and not relating to procedure, such as
              responses to restrictions or election of species); (4) the filing
              of formal papers such as declarations (including Rule 131 and 132
              declarations); (5) the filing of appeal briefs and reply briefs;
              (6) the submission of summaries of interviews during which the
              scope of claims was discussed; (7) the filing of responses to
              reasons for allowances; (8) abandonment of claims; (9) the filing
              of motions and taking of positions in patent interference
              proceedings; and (10) other material actions which could affect
              the scope of protection for Agreement Compounds.

       c.     Neither KUCR nor the University of Kansas will enter into any
              settlement, consent, judgment or other voluntary final disposition
              of litigation or threatened litigation affecting ProQuest Patent
              Rights without the consent of Guilford, which consent shall not be
              unreasonably withheld.

       d.     KUCR agrees to use commercially reasonable efforts, in
              consultation with ProQuest and Guilford, to diligently conduct
              Patent Prosecution of ProQuest Patent Rights in a manner so as to
              preserve and expand the scope of claims therefor to the extent
              reasonably possible.

       e.     In the event that KUCR elects not to pursue Patent Prosecution of
              any ProQuest Patent Rights, KUCR shall give ProQuest and Guilford
              sufficient notice to afford ProQuest or Guilford (as determined
              between them pursuant to the PQ License) the opportunity to do so
              at Guilford's cost, in which event ProQuest or Guilford (as
              determined between them pursuant to the PQ License) will own such
              ProQuest Patent Rights, free and clear of any ownership interest
              of KUCR or the University of Kansas in said ProQuest Patent
              Rights, against reimbursement of past Patent Prosecution costs and
              expenses (adequately documented) incurred by KUCR with respect to
              such ProQuest Patent Rights which have not previously been
              reimbursed to KUCR. KUCR will execute all documents and do all
              things as ProQuest or Guilford may reasonably request in
              connection with the exercise of ProQuest's or Guilford's rights
              under this Section 8.e.

       f.     Notwithstanding the provisions of Section 8.07 of the KU License,
              if Guilford or ProQuest initiates proceedings pursuant to Section
              8.3 of the PQ License, Section 8.3 of the PQ License shall govern
              as between KUCR and ProQuest on the one hand and Guilford on the
              other, and Section 8.07 of the KU License shall govern as between
              KUCR and ProQuest with respect to any payments received by
              ProQuest in accordance with Section 8.3 of the PQ License.

       g.     In the event that Guilford does not initiate an action to enforce
              Patent Rights against a Third Party suspected of infringing a
              claim of ProQuest Patent Rights and ProQuest also does not
              exercise its rights, if any, under Section 8.3(c) of the PQ
              License to initiate such action, then KUCR may give notice to
              Guilford that it intends to bring such enforcement action at its
              own expense under Section 8.08 of the KU License. In such event,
              the parties shall confer, and if Guilford has a commercially
              reasonable basis for foregoing or delaying such infringement
              proceeding, then Guilford's decision shall govern; provided, that
              in determining whether there is a commercially reasonable basis
              for Guilford's decision, any interest (direct or indirect) held by
              Guilford in the infringer shall be disregarded. Any recovery made
              by KUCR pursuant to any such infringement action KUCR brings as
              contemplated in this Section 8.e. will be used first to reimburse
              KUCR for its litigation costs and expenses, second to reimburse
              ProQuest and Guilford for their

                                       3
<PAGE>   84

              litigation costs and expenses incurred in connection with KUCR's
              prosecution, and third divided up among the parties in proportion
              to their expenses.

       h.     If a declaratory judgment or other action alleging invalidity of
              any of the ProQuest Patent Rights shall be brought against KUCR,
              ProQuest or Guilford, then KUCR, ProQuest and Guilford shall
              jointly have the right to defend the action at its own expense,
              respectively.

9.     PATENT MARKING. Guilford agrees to use commercially reasonable efforts to
comply with Article 20 of the KU License with respect to any Agreement Compound
which it may market in the United States or other countries.

10.    NOTICES. Any notices by Guilford required hereunder shall be in
conformity with Article 17 of the KU License. Any notice to Guilford required
hereunder may be given by registered mail, express courier service with receipt,
facsimile (with confirmation) or delivered by hand. The effective date of notice
shall be the date of receipt, and shall be addressed as follows:

              Guilford Pharmaceuticals Inc.
              ATTN:  Secretary
              6611 Tributary Street
              Baltimore, Maryland  21224
              Fax No.: 410/631-6819

Guilford may change the address to which notice and correspondence is to be
given as provided herein by written notice thereof to the other parties.

11.    CONFIDENTIAL INFORMATION. Notwithstanding Article 6 of the KU License,
each party hereto agrees to be bound by the terms and conditions of Section 7.1
of the PQ License, and the rights and obligations of "Disclosing Party" and
"Receiving Party" thereunder with respect to confidential information received
from another party under the KU License, the PQ License or this Consent and
Agreement.

12.    TERM. The term of this Consent and Agreement shall be coincident with the
term of the PQ License. The parties agree that this Consent and Agreement shall
not be terminated so long as the PQ License remains in effect.

13.    GOVERNING LAW. The construction, performance and execution of this
Consent and Agreement shall be governed by the laws of the State of Kansas
(without regard to conflicts of laws provisions).

14.    ENTIRE AGREEMENT. This Consent and Agreement, together with its exhibits,
shall constitute the entire agreement between the parties with respect to the
obligations of the parties regarding the subject matter hereof.

15.    AMENDMENT. This Consent and Agreement may be amended and any of its terms
or conditions waived only by a written instrument executed by the authorized
officials of the parties or, in the case of waiver, by the party waiving
compliance. The failure by any party, at any time or times, to require
performance of any provision hereof shall in no manner affect its rights at a
later time to enforce same. No waiver by any party of any condition or term in
any one or more instance shall be construed as a further or continuing waiver of
such condition or term of any other condition or term.

                                       4
<PAGE>   85

16.    FURTHER ACTIONS. Each party agrees to execute, acknowledge and deliver
such further instruments, and to do all such other acts, as may be necessary or
appropriate in order to carry out the purposes and intent of this Consent and
Agreement.

17.    EXECUTION AND DELIVERY. This Consent and Agreement shall be binding upon
and enforceable with respect to each of the parties as of the date first written
above upon the mutual execution and delivery of this Consent and Agreement by
each of those parties. This Consent and Agreement may be executed in
counterparts, each of which shall be deemed an original but all of which shall
constitute the single agreement.

IN WITNESS WHEREOF, the parties have duly executed this Consent and Agreement
effective as of the Effective Date.

THE UNIVERSITY OF KANSAS CENTER                 GUILFORD PHARMACEUTICALS INC.
    FOR RESEARCH, INC.

By:    /s/ James A. Roberts                     By:    /s/ Thomas C. Seoh
       --------------------                            ------------------
Name:  James A. Roberts                         Name:  Thomas C. Seoh
Title: Vice President                           Title: Senior Vice President,
                                                General Counsel & Secretary

PROQUEST PHARMACEUTICALS INC.

By:    /s/ Osborne S. Wong
       -------------------
Name:  Osborne S. Wong
Title: President

                                       5<PAGE>   1
              AMENDMENT NO. 1 TO STOCK PURCHASE AGREEMENT

      This Amendment No. 1 to Stock Purchase Agreement (the
"Amendment") between Orbital Sciences Corporation ("Orbital") and
Orbital Imaging Corporation (the "Company") is entered into as of the
30th day of March, 2000.

                               RECITALS

      WHEREAS, the parties have entered into that certain Stock
Purchase Agreement as of October 26, 1999 (the "Agreement") pursuant
to which Orbital agreed to purchase Common Shares (as defined
therein) to be issued by the Company.

      WHEREAS, the parties desire to amend the Agreement as set forth
below.

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

      1.   Definitions.   Unless otherwise defined herein, all
capitalized terms herein shall have the meaning assigned to them in
the Agreement.

      2.   Amendment to Article 2.

           (a)  The parties hereby amend the Agreement by deleting
      Section 2.2(a) in its entirety and substituting the following in
      its place:

                "(a) Purchase.  Upon the terms and subject to the
           conditions herein contained, at the Closing (as defined
           herein) on the Closing Date (as defined herein), the
           Company agrees that it will issue and sell to the
           Purchaser, and the Purchaser agrees that it will acquire
           and purchase from the Company, at least 250,000 Common
           Shares.  The purchase price of the Common Shares shall be
           $10.00 per share (the "Per Share Purchase Price").  Except
           as provided below, the Company shall not be obligated to
           sell and the Purchaser shall not be obligated to purchase
           more than an aggregate of 1,250,000 Common Shares.

                     (i)  Notwithstanding the foregoing, in the event
                that the OrbView-4 satellite has not been launched by
                January 31, 2001, then Orbital's obligation to
                purchase Common Shares hereunder shall increase by
                200,000 Common Shares per month thereafter until
                either the OrbView-3 or OrbView-4 satellite has been
                launched; provided however, that under no
                circumstances shall the Company be obligated to sell
                nor shall the Purchaser be obligated to purchase more
                than an aggregate of 2,500,000 Common Shares under
                this Agreement.

<PAGE>   2

                     (ii) For purposes of this Section 2.2(a),
                Orbital shall not be deemed to have failed to launch
                either the OrbView-3 or OrbView-4 Satellites, as the
                case may be, if such failure is the result of an act
                of God, the public enemy, embargo, governmental act,
                fire, accident, war, riot, strikes, inclement weather
                or other cause of a similar nature that is beyond the
                control of Orbital, including a decision by ORBIMAGE
                not to proceed with launch (other than an ORBIMAGE
                decision not to proceed with launch that can be shown
                to be attributable to Orbital's performance or to have
                been within its control or due to its fault or
                negligence as described in Section 14.3 of the Amended
                and Restated OrbView System Procurement Agreement
                between the parties).  In such event, Orbital and
                ORBIMAGE shall agree in good faith to a new launch
                date to occur as soon as possible after the end of
                such event.  If the applicable satellite has not been
                successfully launched by such rescheduled date, then
                Orbital's obligation to purchase additional Common
                Shares shall commence to increase as described in
                Section 2.2(a)(i) above."

           (b)  The parties hereby amend Section 2.2(c) of the
Agreement by deleting the third sentence thereof in its entirety and
inserting the following in its place:

                "Upon receipt of the Purchase Event Notice, the
           Purchaser shall elect to purchase Common Shares in an
           amount not less than 250,000 shares and not more than an
           aggregate of 1,250,000 shares (as such number may be
           adjusted pursuant to Section 2.2(a) of this Agreement)
           (including Common Shares previously purchased pursuant to
           this Agreement, if any) (the "Election Amount Notice")."

           (c)  The parties hereby amend the Agreement by deleting
Section 2.2(e) in its entirety and substituting the following in its
place:

                     "(e) Additional Financings and Series A
           Preemptive Rights.  The Company shall use reasonable
           commercial efforts to consummate one or more financings
           through the issuance of equity or debt securities of the
           Company.  The Purchaser's obligation to purchase Common
           Shares pursuant to Section 2.2(b) shall be reduced on a
           dollar for dollar basis by the net proceeds raised by the
           Company in any such financing.  Furthermore, to the extent
           that any holders of the Company's Series A Preferred Stock
           exercise their preemptive rights pursuant to Section 4.1 of
           the Stockholders Agreement with respect to any Purchase
           Event, the Purchaser's obligations to purchase Common
           Shares pursuant to Section 2.2(a) shall be reduced
           proportionately."

 3.   No Further Changes.

      Except as modified by this Amendment, the Stock Purchase
Agreement remains unmodified and in full force and effect.

<PAGE>   3

IN WITNESS WHEREOF, the parties have caused this Amendment No. 1 to
the Stock Purchase Agreement to be executed as of the date first
written above.

ORBITAL SCIENCES CORPORATION

By:   /s/ James R. Thompson
      -------------------------------------
      James R. Thompson
      President and Chief Operating Officer

ORBITAL IMAGING CORPORATION

By:   /s/ Armand D. Mancini
      -------------------------------------
      Armand D. Mancini
      Vice President and Chief Financial Officer

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