Document:

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                                                                    EXHIBIT 4.23

                          Registration Rights Agreement

         This REGISTRATION RIGHTS AGREEMENT (the "Agreement") is made and
entered into as of April 1, 2003, by and between M&T Bank Corporation, a New
York corporation (together with its permitted successors and assigns,
"Company"), and Allied Irish Banks, p.l.c., a limited liability company
incorporated under the laws of Ireland (together with its permitted successors
and assigns, the "Shareholder").

         WHEREAS, pursuant to the Agreement and Plan of Reorganization by and
among Shareholder, Allfirst Financial Inc. and Company, dated as of September
26, 2002 (the "Reorganization Agreement"), Shareholder has the right to receive
26,700,000 shares of common stock, par value $0.50, of the Company (the
"Shares"); and

         WHEREAS, pursuant to Section 7.4 of the Reorganization Agreement, the
Company and Shareholder have agreed to enter into this Agreement effective as of
the Closing (as defined in the Reorganization Agreement);

         NOW, THEREFORE, the parties hereto, for good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
intending to be bound hereby agree as follows:

SECTION 1.   Definitions.

         As used in this Agreement, the following terms shall have the following
meanings:

         "Agreement" shall have the meaning set forth in the preamble hereto.

         "Business Day" shall mean any day that the New York Stock Exchange is
normally open for trading for a full day and that is not a Saturday, a Sunday or
a day on which banks in the City of New York are authorized or required to close
for regular banking business.

         "Common Stock" shall mean the common stock, par value $0.50 per share,
of Company, or any other shares of capital stock of Company into which such
stock shall be reclassified or changed (by operation of law or otherwise).

         "Company" shall have the meaning set forth in the preamble hereto.

         "Company Registration Statement" shall have the meaning set forth in
Section 4(a) hereof.

         "Delay Period" shall have the meaning set forth in Section 2(b) hereof.

         "Demand Registration" shall have the meaning set forth in Section 3
hereof.

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         "Effective Date" shall have the meaning set forth in Section 2(b)
hereof.

         "Effectiveness Period" shall have the meaning set forth in Section 2(b)
hereof.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder.

         "Reorganization Agreement" shall have the meaning set forth in the
recitals hereto.

         "Person" shall mean an individual, corporation, limited liability
company, partnership, joint venture, joint stock company, association, trust,
unincorporated entity or other entity or organization, including a government or
political subdivision or an agency or instrumentality thereof, whether acting in
an individual, fiduciary or other capacity.

         "Prospectus" shall mean the prospectus included in any registration
statement (including, without limitation, a prospectus that discloses
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A), as amended or supplemented
by any prospectus supplement, with respect to the terms of the offering of any
portion of the Registrable Shares covered by such registration statement and all
other amendments and supplements to the prospectus, including post-effective
amendments, and all material incorporated by reference or deemed to be
incorporated by reference in such prospectus.

         "Registrable Shares" shall means the Shares, any shares of Common Stock
acquired by Shareholder on or after the date hereof not in violation of the
terms of the Reorganization Agreement, and any shares of Common Stock paid,
issued or distributed in respect of such shares by way of stock dividends or
distribution or stock split or in connection with a combination of shares,
recapitalization, reorganization, merger or otherwise, until in the case of any
such shares (i) such shares have been disposed of by Shareholder pursuant to
such effective registration statement under the Securities Act, or (ii) such
share may be transferred by Shareholder without registration or other
restriction pursuant to the Rule 144(k) under the Securities Act or any
successor rule and Company has removed any restrictive legend on the share
certificate evidencing such share.

         "Registration Statement" shall mean the registration statement of
Company filed with the SEC that covers any of the Registrable Shares pursuant to
the provisions of this Agreement, including the Prospectus, amendments and
supplements to such registration statement, including post-effective amendments,
all exhibits, and all material incorporated by reference or deemed to be
incorporated by reference in such registration statement.

         "SEC" shall mean the Securities and Exchange Commission.

         "Securities Act" shall mean the Securities Act of 1933, as amended, and
the rules and regulations promulgated thereunder.

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         "Shareholder" shall have the meaning set forth in the recitals hereof.

         "Shelf Registration" shall have the meaning set forth in Section 2(a)
hereof.

         "underwritten registration" or "underwritten offering" means a
registration in which securities of Company are sold to or through one or more
underwriters for reoffering or sale to the public.

SECTION 2.   Shelf Registration.

                  (a)      Upon a request by Shareholder, Company shall file a
Registration Statement under the Securities Act relating to all or part of the
Registrable Shares, which Registration Statement provides for the sale by
Shareholder of Registrable Shares from time to time on a delayed or continuous
basis pursuant to Rule 415 under the Securities Act (the "Shelf Registration");
provided that Company shall not be obligated (i) to effect more than one Shelf
Registration in any 12-month period, or (ii) to effect a Shelf Registration for
less than one million shares of Common Stock.

                  (b)      Company agrees to use its reasonable best efforts to
cause the SEC to declare the Shelf Registration effective (the date of initial
effectiveness being referred to herein as the "Effective Date") as soon as
practicable and to keep the Shelf Registration continuously effective and usable
for the resale of Registrable Shares for a period ending on the date on which
all the Registrable Shares covered by such Shelf Registration have been sold.
The foregoing notwithstanding, Company shall have the right to suspend the use
of the Shelf Registration for a reasonable length of time (a "Delay Period") and
from time to time if the Chief Executive Officer, Chief Financial Officer or
General Counsel of Company shall determine in good faith that such use (A) would
require disclosure by Company that would materially interfere with a material
financing, merger, sale or acquisition of assets, recapitalization or other
similar corporate action of Company that is pending or expected by Company to
occur or be announced during the Delay Period or (B) would require pre-mature
disclosure of non-public information the disclosure of which, in the good faith
determination of the Chief Executive Officer, Chief Financial Officer or General
Counsel of Company, would be materially adverse to Company or with respect to
which Company has a bona fide business purpose for keeping such information
confidential, it being understood and agreed that while Company is under no
obligation to disclose any such information for the purpose of permitting any
such sale, Company shall endeavor to limit any Delay Period to the period
reasonably necessary for the foregoing purposes, and in exercising its right to
impose Delay Periods shall not treat Shareholder more restrictively than it does
directors and executive officers of Company who have access to such information.
Company shall provide written notice (to the extent practicable) no fewer than 5
Business Days prior to commencement of a Delay Period and promptly upon the end
of any Delay Period to Shareholder and Shareholder shall cease all disposition
efforts with respect to Registrable Shares held by it immediately upon the
beginning of any Delay Period until notified of the end of such Delay Period.

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                  (c)      Company shall use its reasonable best efforts to
remain eligible to register securities on Form S-3, including meeting the
registrant requirements set forth in the instructions to Form S-3.

SECTION 3.   Demand Registration.

         Shareholder may make a written request for registration under the
Securities Act of all or part of its Registrable Securities (a "Demand
Registration"); provided that the Company shall not be obligated (i) to effect
more than two Demand Registrations in any 12-month period, or (ii) to effect a
Demand Registration for less than one million shares of Common Stock. Such
request will specify the number of shares of Registrable Securities proposed to
be sold and will also specify the intended method of disposition thereof.

SECTION 4.   Piggyback Registration.

                  (a)      If Company proposes to file a registration statement
(other than a registration statement filed pursuant to Sections 2 or 3 or a
registration statement on Form S-8 or Form S-4, or their successors) for an
offering and sale of shares of Common Stock by Company in an underwritten
offering or an offering and sale of shares of Common Stock by one or more
selling shareholders, or both the Company and one or more selling shareholders
(a "Company Registration Statement"), it will, prior to such filing, give
written notice to Shareholder of its intention to do so at least 15 days prior
to the anticipated filing date of such Company Registration Statement; provided,
that Company shall not be required to give any notice if the Company
Registration Statement is underwritten and the underwriter(s) thereof shall have
advised Company in writing that inclusion of any securities, other than those to
be sold by Company, would materially and adversely affect the offering.
Company's written notice shall offer to include in such registration statement
for offer to the public such number of Registrable Shares as Shareholder may
request, subject to the conditions set forth herein, and shall specify, to the
extent then known, the number and class and securities proposed to be
registered, the proposed date of filing of such registration statement, any
proposed means of distribution of such securities, any other shareholder of the
Company with the right to have shares of Company Common Stock registered
thereon, any proposed managing underwriter or underwriters of such securities
and (if available or as soon as available) a good faith estimate (which may be a
range) by Company of the proposed maximum offering price of such securities, as
such price is proposed to appear on the facing page of such registration
statement. Upon the written request of Shareholder to Company given within 10
days after Company provides such notice, Company shall use its reasonable best
efforts to cause all Registrable Shares which Company has been requested by
Shareholder to register to be included in such Company Registration Statement.
Company shall have the right to postpone, suspend or withdraw any Company
Registration Statement without obligation to Shareholder. The right of
Shareholder to include its Registrable Shares in any Company Registration
Statement shall be conditioned upon Shareholder's participation in the
underwriting for such Company Registration Statement on the terms set forth
herein. Shareholder shall enter into an underwriting agreement in customary form
with the underwriter or underwriters selected for the underwriting by Company
with

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respect to shares sold by it. Notwithstanding any other provision of this
Section 4, if the managing underwriter advises Company in writing that in its
opinion the inclusion of all shares requested to be registered by Company and
any selling shareholders (including Shareholder) would materially and adversely
affect the offering, Company may limit the number of Registrable Shares to be
included in the Company Registration Statement and underwriting to a number that
would not reasonably be expected to have such affect. In such event, Company
shall so advise Shareholder, and the number of shares that are entitled to be
included in the Company Registration Statement and underwriting shall be
allocated in the following manner:

                           (i)      First, the securities of Company to be
         issued by Company shall be included in the Company Registration
         Statement.

                           (ii)     Second, the securities of Company held by
         Shareholder and other holders of securities of Company who are entitled
         by contract with Company to have securities included in such a
         registration statement shall be included in the Company Registration
         Statement, on a pro rata basis based upon the number of securities of
         Company requested by Shareholder and such other holders to be included
         in such Company Registration Statement.

SECTION 5.   Registration Procedures.

                  (a)      In connection with the registration obligations of
Company pursuant to and in accordance with Sections 2, 3 and 4 hereof (and
subject to Company's rights under Sections 2, 3 and 4 hereof), Company shall use
its reasonable best efforts to effect the registration of such Registrable
Securities as expeditiously as possible, and in connection with such
registration:

                           (i)      with respect to a Demand Registration and a
         Piggyback Registration, Company will use its reasonable best efforts to
         file such registration statement to permit the sale of such Registrable
         Shares in accordance with the intended method or methods of disposition
         thereof, and use reasonable best efforts to cause such filed
         registration statement to become effective, and to remain effective for
         a period of not less than 90 days;

                           (ii)     prepare and file with the SEC such
         amendments (including post-effective amendments) to such registration
         statement, and such supplements to such Prospectus, as may be required
         by the rules, regulations or instructions applicable to the Securities
         Act or the rules and regulations thereunder or any applicable state
         securities laws during the applicable period in accordance with the
         intended methods of disposition by the sellers thereof and cause such
         Prospectus as so supplemented to be filed pursuant to Rule 424 under
         the Securities Act;

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                           (iii)    notify Shareholder promptly and, if
         requested, confirm such notice in writing, (v) when a Prospectus or any
         Prospectus supplement or post-effective amendment has been filed, and,
         with respect to such registration statement or any post-effective
         amendment, when the same has become effective, (w) of any request by
         the SEC for amendments or supplements to such registration statement or
         related Prospectus (including any SEC "comment letter") or for
         additional information regarding Shareholder, (x) of the issuance by
         the SEC of any stop order suspending the effectiveness of such
         registration statement or the initiation of any proceedings for that
         purpose, (y) of the receipt by Company of any notification with respect
         to the suspension of the qualification or exemption from qualification
         of any of the Registrable Shares for sale in any jurisdiction or the
         initiation or threatening of any proceeding for such purpose and (z) at
         any time when a prospectus relating to Registrable Securities is
         required to be delivered under the Securities Act, of the happening of
         any event as a result of which the prospectus included in such
         registration statement contains an untrue statement of a material fact
         or omits any fact necessary to make the statements therein not
         misleading;

                           (iv)     use reasonable best efforts to obtain the
         prompt withdrawal of any order suspending the effectiveness of such
         registration statement, or the prompt lifting of any suspension of the
         qualification or exemption from qualification of any of the Registrable
         Shares for sale in any jurisdiction in the United States;

                           (v)      if requested by Shareholder, furnish to
         Shareholder, without charge, copies of such registration statement as
         declared effective by the SEC and of each post-effective amendment
         thereto, in each case including financial statements and schedules and
         all exhibits and reports incorporated or deemed to be incorporated
         therein by reference; and such number of copies of the preliminary
         Prospectus, each amended preliminary Prospectus, each final Prospectus
         and each post-effective amendment or supplement thereto, as Shareholder
         may reasonably request in order to facilitate the disposition of the
         Registrable Shares in conformity with the requirement of the Securities
         Act (Company hereby consenting to such use of such documents);

                           (vi)     except during any Delay Period, upon the
         occurrence of any event contemplated by paragraph 5(a)(iii)(w) or
         5(a)(iii)(z) above, promptly prepare a supplement or post-effective
         amendment to such registration statement or related Prospectus or any
         document incorporated or deemed to be incorporated therein by reference
         or file any other required document so that, as thereafter delivered to
         the purchasers of the Registrable Shares being sold thereunder, such
         Prospectus will not contain an untrue statement of a material fact or
         omit to state any material fact required to be stated therein or
         necessary to make

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         the statements therein, in light of the circumstances under which they
         were made, not misleading;

                           (vii)    cause all Registrable Shares covered by such
         registration statement to be listed on each U.S. securities exchange,
         if any, on which similar securities issued by Company are then listed;

                           (viii)   use its reasonable best efforts to obtain
         all necessary state securities law or "Blue Sky" permits and approvals
         required for the sale of the Registrable Shares;

                           (ix)     subject to receiving reasonable assurances
         of confidentiality, make available for inspection by Shareholder, any
         underwriter participating in any disposition pursuant to such
         registration statement and any attorney, accountant or other agent
         retained by Shareholder or such underwriter, all financial and other
         records, pertinent corporate documents and properties of Company, and
         cause the managers, officers, members, employees and independent
         accountants of Company to supply all information reasonably requested
         by any Shareholder, underwriter, attorney, accountant or agent in
         connection with such registration statement;

                           (x)      otherwise use its reasonable best efforts to
         comply with all applicable rules and regulations of the SEC, and make
         available to Shareholder, as soon as reasonably practicable, an
         earnings statement covering the period of at least twelve months
         beginning with the first day of the first full calendar quarter of
         Company after the effective date of the registration statement, which
         earnings statement shall satisfy the provisions of Section 11(a) of the
         Securities Act and Rule 158 promulgated thereunder;

                           (xi)     permit Shareholder, if it might be deemed to
         be an underwriter or a controlling person of the Company to participate
         in the preparation of such registration or comparable statement and to
         request the insertion therein of material, furnished to the Company in
         writing, which in the reasonable judgment of Shareholder and its
         counsel should be included, and Company shall include such material,
         unless in the reasonable judgment of Company and its counsel, the
         material should be not included;

                           (xii)    obtain a "comfort" letter from the
         independent public accountants of Company in customary form and
         covering such matters of the type customarily covered by "comfort"
         letters as Shareholder reasonably requests; and

                           (xiii)   otherwise facilitate such registration and
         related offering.

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                  (b)      Company may require Shareholder to furnish such
information regarding the distribution of such Registrable Shares and as to
Shareholder as it may from time to time reasonably request.

                  (c)      Shareholder agrees by inclusion of such Registrable
Shares in a registration statement that, upon receipt of any notice from Company
of the happening of any event of the kind described in clauses (w), (x), (y) or
(z) of Section 5(a)(iii) hereof or upon notice of the commencement of any Delay
Period, it shall forthwith discontinue disposition of such Registrable Shares
covered by such registration statement or Prospectus pursuant to such
registration statement until its receipt of the copies of the supplemented or
amended Prospectus contemplated by Section 5(a)(vi) hereof, or until it is
advised in writing by Company that the use of the applicable Prospectus may be
resumed, and has received copies of any amended or supplemented Prospectus or
any additional or supplemental filings which are incorporated, or deemed to be
incorporated, by reference in such Prospectus and, if requested by Company,
Shareholder shall deliver to Company (at the expense of Company) all copies,
other than permanent file copies then in Shareholder's possession, of the
Prospectus covering such Registrable Shares at the time of receipt of such
request. Shareholder further agrees not to utilize any material other than the
applicable current Prospectus in connection with the offering of Registrable
Shares pursuant to a registration statement.

                  (d)      If Shareholder desires to effect the sale and
distribution of some or all of the Registrable Securities covered by a
registration statement by means of an underwriting, it shall so advise Company,
and Company and Shareholder shall enter into an underwriting agreement in
customary form (including customary indemnification and contribution provisions
on the part of Company) for such purpose and shall otherwise cooperate
reasonably with respect to such underwriting. The underwriter(s) shall be
selected by Shareholder and shall be reasonably acceptable to Company.

SECTION 6.   Indemnification and Contribution.

                  (a)      Company will indemnify and hold harmless Shareholder
and each Person who participates as an underwriter, each Person, if any, who
controls the Shareholder or such underwriter within the meaning of either
Section 15 of the Securities Act or Section 20 of the Exchange Act, and their
respective agents, employees, officers and directors (including those of such
controlling Person) against any losses, claims, damages or liabilities to which
such indemnified party may become subject, under the Securities Act or
otherwise, insofar as such losses, claims, damages, judgments, liabilities or
reasonable expenses (or any action in respect thereof) arise out of or are based
upon an untrue statement or alleged untrue statement of a material fact
contained in any registration statement pursuant to which Registrable Securities
were registered under the Securities Act or Prospectus or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse such
indemnified parties for any legal or other expenses reasonably incurred by them
in connection with investigating or defending against such loss, claim, damage,
judgment or liability as such expenses are incurred; provided, however, that
Company

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shall not be liable in any such case to the extent any such loss, claim, damage,
judgment, liability or reasonable expense arises out of or is based upon an
untrue statement or alleged untrue statement or omission or alleged omission
made therein in reliance upon and in conformity with information furnished in
writing to Company by such indemnified party specifically for use in the
preparation thereof; provided, further, that Company shall not be liable to any
indemnified party hereunder with respect to the registration statement or
Prospectus to the extent that any such loss, claim, damage, judgment, liability
or reasonable expense of such indemnified party results solely from an untrue
statement of a material fact contained in, or the omission of a material fact
from, the registration statement or Prospectus which untrue statement or
omission was corrected in an amended or supplemented registration statement or
Prospectus, if the Person alleging such loss, claim, damage or liability was not
sent or given, at or prior to the written confirmation of such sale, a copy of
the amended or supplemented registration statement or Prospectus if Company had
previously furnished copies thereof to such indemnified party and such
indemnified party was required under the Securities Act to deliver such amended
or supplemented registration statement or Prospectus.

                  (b)      Shareholder will indemnify and hold harmless Company,
each Person who participates as an underwriter, each Person, if any, who
controls the Shareholder or such underwriter within the meaning of either
Section 15 of the Securities Act or Section 20 of the Exchange Act, and their
respective agents, employees, officers and directors (including those of such
controlling Person) against any losses, claims, damages, judgments, liabilities
or reasonable expenses to which each such indemnified party may become subject,
under the Securities Act or otherwise, to the same extent as the foregoing
indemnity from Company, but only insofar as such losses, claims, damages,
judgment, liability or reasonable expense arise out of or are based upon
misstatements or alleged misstatements or omissions or alleged omissions made in
reliance upon and in conformity with information furnished in writing by
Shareholder to Company specifically for use in the preparation of a registration
statement (or any amendment or supplement thereto).

                  (c)      Promptly after receipt by an indemnified party of
notice of the commencement of any action, such indemnified party shall notify
the indemnifying party in writing of the commencement thereof, but the omission
so to notify the indemnifying party shall not relieve it from any liability that
it may have to any indemnified party except to the extent the indemnifying party
shall have been prejudiced as a result of such failure. In case any such action
shall be brought against any indemnified party, and it shall notify the
indemnifying party of the commencement thereof, the indemnifying party shall be
entitled to participate in, and, to the extent that it shall wish, to assume the
defense thereof, with counsel reasonably satisfactory to such indemnified party.
In the event the indemnifying party shall assume the defense thereof, any such
indemnified party shall have the right to employ separate counsel in such action
and to participate in the defense thereof, but the fees and expenses of such
counsel shall be at the expense of such indemnified party unless (a) the
indemnifying party has agreed to pay such fees and expenses, (b) the named
parties to any such action or proceeding (including any impleaded parties)
include both such indemnified party and the indemnifying party, and such
indemnified party shall have been advised by counsel of

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any actual or potential conflict of interest or that there may be one or more
legal defenses available to such indemnified party which are different from or
additional to those available to the indemnifying party (in which case, if such
indemnified party notifies the indemnifying party in writing that it elects to
employ separate counsel at the expense of the indemnifying party, the
indemnifying party shall not have the right to assume the defense of such action
or proceeding on behalf of such indemnified party, it being understood, however,
that the indemnifying party shall not, in connection with any one such action or
proceeding or separate but substantially similar or related actions or
proceedings in the same jurisdiction arising out of the same general allegations
or circumstances, be liable for the fees and expense of more than one separate
firm of attorneys (together with appropriate local counsel) at any time for all
such indemnified parties), or (c) the indemnifying party shall not have employed
counsel reasonably satisfactory to the indemnified party within a reasonable
time after the indemnified party has given notice of commencement in compliance
with this clause (c) . Any such fees and expenses payable by the indemnifying
party shall be paid to the indemnified party entitled thereto as incurred by
such indemnified party. The indemnifying party shall not be liable for any
settlement of any such action or proceeding effected without its written consent
(which shall not be unreasonably withheld), but if settled with its written
consent, or if there be a final judgment for the plaintiff in any such action or
proceeding, the indemnifying party agrees to indemnify and hold harmless each
such indemnified party from and against any loss or liability by reason of such
settlement or judgment. The indemnifying party shall not, without the prior
written consent of the indemnified party (which consent shall not be
unreasonably withheld), consent to the entry of any judgment against the
indemnified party or enter into any settlement or compromise that (x) does not
include, as an unconditional term thereof, the giving by the claimant or
plaintiff to the indemnified party of a release, in form and substance
reasonably satisfactory to the indemnified party, from all liability in respect
of such claim or litigation, or (y) requires the indemnified party to admit any
wrongdoing.

                  (d)      In order to provide for just and equitable
contribution in circumstances in which the indemnity agreement provided for in
this Section 6 is for any reason held to be unenforceable by the indemnified
parties although applicable in accordance with its terms in respect of any
losses, liabilities, claims, damages, judgments and expenses suffered by an
indemnified party referred to therein, each applicable indemnifying party, in
lieu of indemnifying such indemnified party, shall contribute to the amount paid
or payable by such indemnified party as a result of such losses, liabilities,
claims, damages, judgments and expenses in such proportion as is appropriate to
reflect the relative fault of the Company on the one hand and of the Shareholder
on the other (including without limitation that of their respective officers,
directors, employees and agents) in connection with the statements or omissions
which resulted in such losses, liabilities, claims, damages, judgments or
expenses, as well as any other relevant equitable considerations. The relative
fault of the Company on the one hand and the Shareholder on the other (including
without limitation, in each case, that of their respective officers, directors,
employees and agents) shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Company, on the one hand, or by or on behalf of the Shareholder,
on the other, and

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the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission. The amount
paid or payable by a party as a result of the losses, liabilities, claims,
damages, judgments and expenses referred to above shall be deemed to include,
subject to the limitations set forth in Section 6(c), any legal or other fees or
expenses reasonably incurred by such party in connection with investigating or
defending any action or claim.

                  (e)      Notwithstanding the provisions of this Section 6(e),
in the case of distributions to the public, Shareholder shall not be required to
contribute any amount in excess of the amount by which (A) the total price at
which the Registrable Securities sold by Shareholder and distributed to the
public were offered to the public exceeds (B) the amount of any damages which
Shareholder has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any Person who was not
guilty of such fraudulent misrepresentation.

                  (f)      The obligations of Company and Shareholder under this
Section 6 shall be in addition to any liability that such Persons may otherwise
have. For purposes of this Section 6, each Person, if any, who controls
Shareholder or an underwriter within the meaning of either Section 15 of the
Securities Act or Section 20 of the Exchange Act (and their respective partners,
directors, officers and employees) shall have the same rights to contribution as
Shareholder or such underwriter; and each director of the Company, each officer
of the Company who signed the registration statement, and each person, if any,
who controls the Company within the meaning of either Section 15 of the
Securities Act or Section 20 of the Exchange Act, shall have the same rights to
contribution as the Company.

SECTION 7.   Registration Expenses.

         Except as provided below, whether or not any registration statement
becomes effective, Company shall pay all costs, fees and expenses incident to
Company's performance of or compliance with this Agreement including, without
limitation, (i) SEC registration and filing fees, fees and expenses of
compliance with securities or Blue Sky laws; (ii) printing expenses and fees;
(iii) fees and expenses incurred in connection with the listing of the
Registrable Securities; (iv) fees and disbursements of counsel for Company; (v)
fees and disbursements of all independent certified public accountants of
Company (including the expenses of any comfort letters obtained pursuant to
Section 5(a)(xiii) and all other Persons retained by Company in connection with
the registration statement; and (vi) the reasonable fees and expenses of any
additional experts retained by the Company in connection with such registration.
In all cases, Shareholder will be responsible for underwriters' discounts,
selling commissions and fees and disbursements of its counsel with respect to
the Registrable Shares being sold by it.

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SECTION 8.   "Stand-Off" Agreement.

         Shareholder, if reasonably requested by the managing underwriter of an
underwritten offering of securities by Company, shall agree not to sell or
otherwise transfer or dispose of any Registrable Shares during the 3-day period
prior to, and during the 90-day period beginning on, the closing date of such
underwritten offering, provided that such agreement shall be on terms customary
for such agreements (including exceptions to the foregoing obligation). Company,
if reasonably requested by the managing underwriter of an underwritten offering
of securities by Shareholder, shall agree not to sell or otherwise transfer or
dispose of any Company Common Stock during the 3-day period prior to, and during
the 90-day period beginning on, the closing date of such underwritten offering,
provided that such agreement shall be on terms customary for such agreements
(including exceptions to the foregoing obligation).

SECTION 9.   Miscellaneous.

         9.1      Termination. This Agreement and the obligations of Company
hereunder shall terminate on the earlier of the (i) first date on which no
Registrable Shares remain outstanding and (ii) the date all Registrable Shares
may be sold in a single three-month period pursuant to Rule 144 under the
Securities Act.; provided that in the case of clause (ii), this Agreement shall
not terminate with respect to any then effective Registration Statement under
which there are Registrable Shares registered unless such Registrable Shares may
be transferred by Shareholder without registration or other restriction pursuant
to the Rule 144(k) under the Securities Act or any successor rule and Company
has removed any restrictive legend on the share certificate evidencing such
share; provided that the foregoing Sections 6 and 7 of this Agreement shall
survive any such termination in accordance with their terms.

         9.2      Amendments and Waivers. The provisions of this Agreement
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions herein
may not be given, unless consent is obtained from the party against whom such
waiver, modification or amendment is sought to be enforced.

         9.3      Notices. All notices, requests, demands and other
communications required or permitted herein shall be in writing and shall be
deemed given: when delivered personally; one Business Day after being deposited
with a next-day air courier; when answered back if telexed and when receipt is
acknowledged, if telecopied, in each case to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice; provided that notices of a change of address shall be effective only
upon receipt thereof);

                          (i)      if Shareholder, to:

                            Allied Irish Banks, plc
                            Bankcentre, Ballsbridge
                            Dublin 4, Ireland

                                       12
<PAGE>

                            Attn: Bryan Sheridan
                                  Group Law Agent
                            Facsimile No: 011-353-1-668-9677

                        With a required copy to:

                            Wachtell, Lipton, Rosen & Katz
                            51 West 52nd Street
                            New York, New York 10019
                            Attn:  Edward D. Herlihy, Esq.
                            Facsimile No: (212) 403-2000

                          (ii)     if to Company, to:

                            M&T Bank Corporation
                            One M&T Plaza
                            Buffalo, New York  14229
                            Attn:  Michael Pinto
                                   Executive Vice President and Chief
                                   Financial Officer
                            Facsimile No: (716) 842-5177

                          With a required copy to:

                            M&T Bank Corporation
                            One M&T Plaza
                            Buffalo, New York  14229
                            Attn: Richard A. Lammert, Esquire
                                  Senior Vice President and General Counsel
                            Facsimile No: (716) 842-5177

                          and to:

                            Arnold & Porter
                            555 Twelfth Street, N.W.
                            Washington, D.C.  20004
                            Attn:  Steven Kaplan, Esquire
                            Facsimile No: (202) 942-5999

         9.4      Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors and assigns of each of the
parties; provided that without the written consent of Company, Shareholder may
not assign its rights hereunder to a Person other than any direct or indirect
Subsidiary of Shareholder of which

                                       13
<PAGE>

Shareholder holds 80% or more of the outstanding equity capital or voting shares
and to which Registrable Shares have been transferred in compliance with the
provisions of the Reorganization Agreement; provided that no such assignment
shall be effective or confer any right on any such assignee unless, prior to
such assignment, the assignee agrees in writing, in form and substance
reasonably satisfactory to Company, that such assignee will be bound by all
provisions binding on Shareholder hereunder. Neither this Agreement nor any
provision hereof is intended to confer upon any Person other than the parties
hereto and any successor or assignee any rights or remedies hereunder.

         9.5      Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

         9.6      Specific Performance. Each of the parties hereto, in addition
to being entitled to exercise all rights provided herein or granted by law,
shall be entitled to specific performance of its rights under this Agreement.
Each of the parties agrees that monetary damages would not be adequate
compensation for any loss incurred by reason of a breach by any such party of
the provisions of this Agreement and hereby agrees to waive the defense in any
action for specific performance that a remedy at law would be adequate.

         9.7      Headings; Sections. The headings in this Agreement are for
convenience of reference only and shall not limit or otherwise affect the
meaning hereof. All references to Sections shall refer to Sections of this
Agreement, unless otherwise stated.

         9.8      Governing Law.

                  (a)      Except to the extent superceded by Federal law, this
Agreement shall be governed by and construed in accordance with the law of the
State of New York, without regard to the conflicts of law rules of such state
that would construe this Agreement under the laws of another state.

                  (b)      Any action brought in connection with this Agreement
shall be brought in the courts of the State of New York located in the City of
New York or of the United States of America for the Southern District of New
York, which courts shall have exclusive jurisdiction. The parties further agree,
to the extent permitted by law, that final and unappealable judgment against any
of them in any action or proceeding contemplated above shall be conclusive and
may be enforced in any other jurisdiction within or outside the United States by
suit on the judgment, a certified copy of which shall be conclusive evidence of
the fact and amount of such judgment.

                  (c)      By the execution and delivery of this Agreement, each
of the parties hereto submits to the personal jurisdiction of any court of the
State of New York located in the City of New York or of the United States of
America for the Southern

                                       14
<PAGE>

District of New York in any action or proceeding arising out of or relating to
this Agreement and the transactions contemplated hereby.

                  (d)      To the extent that Shareholder or Company has or
hereafter may acquire any immunity from jurisdiction of any court or from any
legal process (whether through service or notice, attachment prior to judgment,
attachment in aid of execution, execution or otherwise) with respect to itself
or its property, Shareholder and Company each hereby irrevocably waive such
immunity in respect of its obligations with respect to this Agreement.

                  (e)      Each party waives, to the fullest extent permitted by
applicable law, any right it may have to a trial by jury in respect of any
action or proceeding arising out of or relating to this Agreement or the
transactions contemplated hereby.

         9.9      Severability. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their best efforts to find and employ and alternative means to
achieve the same or substantially the same result as that contemplated by such
term, provision, covenant or restriction. It is hereby stipulated and declared
to be the intention of the parties that they would have executed the remaining
terms, provisions, covenants and restrictions without including any of such that
may be hereafter declared invalid, illegal, void or unenforceable.

         9.10     Entire Agreement. This Agreement is intended by the parties as
a final expression of their agreement and a complete and exclusive statement of
the agreement and understanding of the parties hereto in respect of the subject
matter contained herein. There are no restrictions, promises, warranties or
undertakings, other than those set forth or referred to herein, with respect to
the registration rights granted by Company with respect to the Registrable
Shares. This Agreement supersedes all prior agreements and understandings
between the parties with respect to such subject matter.

         9.11     Calculation of Time Periods. Except as otherwise indicated,
all periods of time referred to herein shall include all Saturdays, Sundays and
holidays; provided, that if the date to perform the act or give any notice with
respect to this Agreement shall fall on a day other than a Business Day, such
act or notice may be timely performed or given if performed or given on the next
succeeding Business Day.

                                       15
<PAGE>

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

                              M&T BANK CORPORATION

                              By: /s/ Michael P. Pinto
                                  ---------------------------------
                                  Name:  Michael P. Pinto
                                  Title: Executive Vice President and
                                         Chief Financial Officer

                              ALLIED IRISH BANKS, P.L.C.

                              By: /s/ Michael D. Buckley
                                  ---------------------------------
                                  Name:  Michael D. Buckley
                                  Title: Group Chief Executive

                                       16<PAGE>
                                                                  EXHIBIT 10.01

[***] indicates the omission of confidential portions for which confidential
treatment has been requested. Such confidential information has been filed
separately with the Commission.
================================================================================

                             CARDINAL DISTRIBUTION*

                                       AND

                              EXPRESS SCRIPTS, INC.

                             PRIME VENDOR AGREEMENT

================================================================================

<PAGE>

                             PRIME VENDOR AGREEMENT

         THIS PRIME VENDOR AGREEMENT (THE "AGREEMENT") IS MADE JULY 1, 2001,
BETWEEN EXPRESS SCRIPTS, INC., ON BEHALF OF ITSELF AND ITS SUBSIDIARIES
(COLLECTIVELY, "BUYER") AND CARDINAL DISTRIBUTION* ("CARDINAL"), WHO HEREBY
AGREE AS FOLLOWS:

1.       DESIGNATION AS PRIMARY WHOLESALER

                  During the term of this Agreement, Buyer will designate
         Cardinal as the primary wholesale pharmaceutical supplier to all
         pharmacies whether now or hereafter owned, managed or operated by Buyer
         in the United States (collectively, the "PHARMACIES" and individually,
         a "PHARMACY"). A current list of the Pharmacies is attached hereto as
         EXHIBIT A. Additional pharmacies may be added to Exhibit A from time to
         time subject to the prior approval of Buyer and Cardinal.

2.       SALE OF MERCHANDISE

                  Buyer will purchase from Cardinal during the term of this
         Agreement its Primary Wholesale Requirements of pharmaceuticals for the
         Pharmacies ("RX PRODUCTS") and, may, at its option, purchase certain
         other inventory carried by Cardinal ("NON-RX PRODUCTS" and, together
         with Rx Products, collectively the "MERCHANDISE") for delivery directly
         to the Pharmacies ("DIRECT STORE DELIVERY Purchases"). The term
         "PRIMARY WHOLESALE REQUIREMENTS" means that Buyer will purchase for
         each Pharmacy all of its requirements of Rx Products purchased from
         wholesalers from Cardinal. With the exception of Merchandise that is
         only available from the manufacturer with less than six (6) months'
         dating, Cardinal removes Merchandise from its inventory that has an
         expiration date of six (6) months, not including the current month, so
         that such Merchandise shipped to Buyer has a minimum of six (6) months'
         dating. Cardinal reserves the right at all times to determine what
         Merchandise it will carry based upon product quality, manufacturer
         indemnity, insurance, and other policies, and other standards
         determined by it, and may delete from its available inventory items of
         Merchandise with limited or no movement activity.

                  Cardinal acknowledges that Buyer, from time to time, [***],
         including [***]

3.       PURCHASE PRICE

                  Buyer will pay a purchase price for all Merchandise purchased
         under this Agreement in an amount equal to Cardinal's Cost plus the
         percentage specified in the pricing matrix attached hereto as EXHIBIT B
         (the "PRICING MATRIX"). For purposes of this Agreement: (a) the term
         "CARDINAL'S COST" will mean the manufacturer's published wholesale
         acquisition cost for Merchandise at the date of Cardinal's invoice to
         the Pharmacy, including all discounts, price reductions and promotions
         offered off-invoice by the manufacturer for the duration of the
         manufacturer's offer period, but without reduction for customary cash
         discounts; and (b) the term "QUALIFIED PURCHASES" will

--------------------------------------------------------------------------------
                                        2
<PAGE>

         mean all purchases made and paid for by Buyer and/or the Pharmacies
         under the terms of this Agreement, net of all returns, credits,
         rebates, late charges, or other similar items, on an annual, quarterly,
         or monthly basis, as applicable. Notwithstanding anything herein to the
         contrary, the purchase price of Merchandise which is subject to a
         Manufacturer Contract (as hereinafter defined) will be Buyer's contract
         price for the Pharmacies. Cardinal reserves the right to adjust the
         purchase price of any item of Merchandise in the event that the
         manufacturer of such item implements a change in policy which
         eliminates or decreases the customary cash discount terms effective on
         the Commencement Date with respect to such item.

                  The purchase price for selected Merchandise, including but not
         limited to [***] described above [***] in accordance with [***].
         Merchandise described in this paragraph is sometimes referred to as
         [***]

                  The pricing specified in the Pricing Matrix does not reflect
         administrative fees for membership in any group purchasing organization
         (a "GPO"). If any Pharmacy affiliates with a GPO, the appropriate
         administrative fee will be added to the percentages specified in the
         Pricing Matrix.

                  [***] CardinalCHOICE(R) pharmacy system [***] for the pricing
         specified in the Pricing Matrix.

4.       [***] AND SAVINGS

                  During the initial term of this Agreement, [***] with related
         savings as more fully described on EXHIBIT C.

5.       PAYMENT TERMS

                  (a) Initial Payment Terms. The payment terms initially
         applicable to Buyer will be as follows:

                           (i) For DIRECT STORE DELIVERY PURCHASES, Buyer shall
                  cause Cardinal to receive payment in full by not later than
                  [***] of each calendar month of the amount due for all
                  Merchandise delivered and services provided during the first
                  (1st) [***] of such calendar month, and by not later than the
                  [***] of each calendar month, of the amount due for all
                  Merchandise delivered and services provided during the period
                  beginning on the [***] of the preceding calendar month and
                  ending on the last day of such preceding calendar month [***].

                           (ii) For [***] (I.E., [***]

                           (iii) For [***] in accordance with the terms set
                  forth in Exhibit C [***]

--------------------------------------------------------------------------------
                                        3
<PAGE>

                  If any payments are due on Saturday, Buyer will cause Cardinal
         to receive payment in full on the immediately preceding Friday, and if
         payment is due on Sunday, Buyer will cause Cardinal to receive payment
         in full on the immediately following Monday.

                  Buyer will deliver to Cardinal any credit information
         reasonably requested by Cardinal not less than thirty (30) days prior
         to its initial purchases of Merchandise under this Agreement. All
         payments for the Merchandise purchased under this Agreement will be due
         in accordance with the terms set forth above unless and until otherwise
         agreed by Buyer and Cardinal. In such event, Buyer acknowledges and
         agrees that Buyer's Cost of Goods may be adjusted by Cardinal to
         reflect Buyer's new payment terms and credit considerations deemed
         relevant to Cardinal.

                  (b) Payment. At the end of each calendar month, Cardinal will
         evaluate Buyer's payment history, adjusted to reflect legitimately
         disputed amounts. The due date of each Cardinal invoice will be
         compared with the date Cardinal received payment to relieve that
         invoice. Buyer and Cardinal acknowledge that Buyer's cost to purchase
         Merchandise from Cardinal is based upon Buyer making payments in
         accordance with Buyer's applicable payment terms as set forth above.

                  For those invoices paid after the applicable due date, Buyer
         will pay to Cardinal an amount equal to [***] times the amount of each
         invoice times the number of days the payment to relieve the invoice was
         late. Cardinal will provide an invoice to Buyer for all amounts due
         hereunder by the 10th of the following month. Such invoice will reflect
         the amount due to Cardinal for those invoices that were paid beyond
         Buyer's applicable payment terms. This invoice will be accompanied by
         an electronic file that will detail the calculation of all amounts due.
         Buyer shall remit payment for such invoice by the 20th of the month in
         which it was billed. Failure or delay by Cardinal to bill Buyer for any
         amounts due hereunder shall not waive Cardinal's right to receive the
         same.

                  All payments for Merchandise delivered and services provided
         by Cardinal will be made to the applicable servicing division specified
         in Cardinal's invoice (or as otherwise specified by Cardinal) by
         electronic funds transfer or other method acceptable to Cardinal so as
         to provide Cardinal with good funds by the due date. In addition to all
         other rights and remedies contained in this Agreement, Cardinal retains
         the right, in its sole discretion, but exercising good faith, to
         immediately, upon written notice to Buyer, change Buyer's payment terms
         or place Buyer on C.O.D. status if Cardinal has not received payment
         when due for Merchandise delivered or services provided to Buyer, or
         based upon credit considerations deemed relevant by Cardinal, as
         determined by Cardinal in good faith. The provisions of Sections 25 and
         26 shall not be applicable to this provision.

                  If Cardinal changes Buyer's payment terms or places Buyer on
         C.O.D. status pursuant to this Section 5(b), and Buyer remains subject
         to such payment terms for at least ninety (90) consecutive days, or on
         C.O.D. for at least sixty consecutive (60) days, Buyer may terminate
         this Agreement upon written notice to Cardinal and payment of all

--------------------------------------------------------------------------------
                                        4
<PAGE>

         outstanding amounts due from Buyer to Cardinal. No termination notice
         from Buyer to Cardinal shall be effective until all outstanding amounts
         due from Buyer to Cardinal are paid in full. During the applicable time
         period, Cardinal and Buyer shall negotiate in good faith regarding
         restoring Buyer's payment terms to those in effect prior to any action
         taken by Cardinal hereunder.

                  (c) Submission of Financial Statements. Buyer will provide
         Cardinal with a copy of its publicly available financial statements as
         Cardinal may reasonably request from time to time.

                  (d) Guaranty. As an inducement for Cardinal to supply
         Merchandise and provide services to the subsidiaries and affiliates of
         Buyer, whether existing now or in the future (collectively,
         "Borrowers"), Buyer (i) guarantees to Cardinal the punctual and full
         payment (and not merely the ultimate collectability) of all sums now or
         hereafter due from Borrowers to Cardinal and (ii) agrees to pay to
         Cardinal on demand the reasonable cost and expense incurred by Cardinal
         in attempting to enforce any indebtedness, liability, or obligation
         under this Agreement, including, without limitation, reasonable
         attorney's fees.

6.       ORDERING AND DELIVERY

                  Cardinal will deliver the Merchandise F.O.B. destination to
         the applicable Pharmacy and exercise its good faith efforts to provide
         an efficient delivery schedule designed to meet the mutual needs of
         Cardinal and the Pharmacies, in accordance with Cardinal's general
         delivery schedules established from time to time by the applicable
         Cardinal servicing division (exclusive of holidays, etc.). All
         deliveries will be accompanied by an invoice and all delivery costs
         (not including emergency deliveries) absorbed by Cardinal. Pharmacies
         having Qualified Monthly Purchases in excess of $[***] will be eligible
         to receive [***], except Pharmacies located outside of the contiguous
         United States or other Pharmacies mutually agreed upon by the parties
         from time to time; provided, however, Buyer's Pharmacies located in
         Tempe, Arizona, Albuquerque, New Mexico, and St. Louis, Missouri, will
         be eligible to receive [***]. Buyer will incur a separate delivery
         charge, not to exceed Cardinal's actual cost, for additional
         deliveries. Delivery schedules and purchase order deadlines may be
         reviewed and changed from time to time as mutually agreed upon by
         Cardinal and Buyer. Cardinal will make every reasonable effort to
         accommodate individual order entry and delivery requirements.

                  Buyer will submit all orders, except for orders for Schedule
         II drugs, for all Merchandise to Cardinal via electronic order entry
         using equipment supplied by Cardinal to Buyer at no additional charge
         to Buyer or other mutually agreeable electronic means. This equipment
         benefits Buyer and the Pharmacies and relates to the provision of
         products and services by Cardinal hereunder. Buyer and each Pharmacy
         agree not to use such equipment (including hardware and software) for
         any purpose unrelated to this Agreement. Any such equipment supplied by
         Cardinal will be returned to Cardinal by Buyer upon the expiration or
         termination of this Agreement for any reason or prior to termination or
         expiration if Cardinal reasonably believes its proprietary rights are

--------------------------------------------------------------------------------
                                        5
<PAGE>

         threatened. In the event that electronic order entry is temporarily
         interrupted for reasons beyond the control of Buyer or Cardinal, Buyer
         may place orders manually and both parties will use reasonable efforts
         to rectify the problem.

                  DEA Form 222 may be mailed to the applicable Cardinal
         distribution center or given to the delivery driver. Schedule II orders
         will be delivered within one (1) day of Cardinal's receipt of the
         signed original DEA Form 222. Buyer acknowledges that if Buyer gives
         the DEA Form 222s to the delivery driver, such forms will not be
         received by Cardinal until such time that the delivery driver
         physically delivers the DEA Form 222 to the applicable Cardinal
         distribution center. Notwithstanding the foregoing, no Schedule II
         orders will be delivered other than in compliance with DEA regulations.

7.       OTHER SERVICES

                  Cardinal will provide the services to Buyer and the Pharmacies
         as set forth EXHIBIT D to this Agreement, pursuant to the terms and
         conditions contained therein.

8.       EMERGENCY DELIVERIES

                  Cardinal will provide a twenty-four (24) hour, seven (7) day
         per week emergency delivery service. The courier charge for such orders
         will be prepaid by Cardinal and added to Buyer's invoice. A listing of
         key management personnel and emergency order procedures will be
         supplied to each Pharmacy.

9.       BACKORDER RELAY

                  [***] a "backorder relay" system [***].

10.      MANUFACTURER CONTRACT ADMINISTRATION

                  Cardinal will recognize and administer manufacturer contracts
         between Buyer and any manufacturer (collectively, "MANUFACTURER
         CONTRACTS") subject to such Manufacturer Contracts' continued validity
         in accordance with applicable laws and subject to such credit
         considerations concerning the applicable manufacturers as Cardinal may
         consider appropriate; however, if manufacturers' chargebacks for
         contract items submitted by Cardinal are disallowed, uncollectable, or
         unreconcilable, then the applicable charge will be billed back to
         Buyer. Cardinal reserves the right, at any time, to decline to sell or
         carry any manufacturer's merchandise, based upon credit considerations
         deemed relevant to Cardinal. Buyer will notify Cardinal of all
         Manufacturer Contracts. In addition, Buyer or the Pharmacies will
         provide Cardinal with a copy of all new Manufacturer Contracts entered
         into after the Commencement Date and manufacturer verification of all
         renewals, replacements or terminations of Manufacturer Contracts not
         less than forty-five (45) days prior to the effective date of such new
         Contract, renewal, replacement or termination. Failure to comply with
         these notice requirements will entitle Cardinal to discontinue the
         service level provisions herein until forty-five (45) days after
         delivery of accurate usage data for the new items.

--------------------------------------------------------------------------------
                                        6
<PAGE>

                  In order to facilitate Cardinal's inventory management
         requirements, Buyer will provide Cardinal, with respect to each
         Pharmacy not currently being serviced by Cardinal, but to be included
         hereunder as a Pharmacy, available six (6) months' usage figures
         (including NDC numbers) on both contract and non-contract items in
         compatible electronic (disk) format thirty (30) days prior to
         participation under this Agreement by that Pharmacy. The service level
         provisions set forth in Section 12 below will be waived by Buyer until
         accurate usage figures are obtained by Cardinal with regard to such
         Pharmacies, or for six (6) months, whichever is less. All purchases
         under this Agreement by Buyer will be for the Pharmacies' "own use" as
         that term is defined in judicial or legislative interpretation, and
         Buyer will comply with applicable manufacturers' pricing criteria and
         policies.

11.      LICENSURE

                  Buyer attests to Cardinal that Buyer's Pharmacies are all
         properly licensed with applicable state licensing agencies to receive,
         dispense, distribute and otherwise legally dispose of Rx Products.
         Buyer understands that by attesting to this, Cardinal is complying with
         the "good faith inquiry" standard to ensure that Rx Products are
         distributed to properly licensed and/or registered pharmacy locations.
         Prior to purchasing Rx Products from Cardinal hereunder, Buyer will
         provide Cardinal with copies of all such licenses and any renewals,
         revocations or other changes to the same.

12.      SERVICE LEVEL

                  For [***] Cardinal will exercise all reasonable efforts to
         provide [***] ([***]%) [***] in accordance with Cardinal's customary
         standards and procedures in effect from time to time. [***] ([***]%)
         [***] ([***]%) [***] ([***]%) [***] For example, [***]
         $[***]%[***]$[***]([***])[***]% -[***]% = [***]% and ([***])[***]% x
         $[***]x[***]% = $[***]([***])[***].

                  Buyer may, [***] ([***]%), [***] (as hereinafter defined) and
         [***]

                  Notwithstanding [***] set forth above, [***] in accordance
         with Cardinal's customary standards and procedures in effect from time
         to time is [***] ([***]%), [***] as set forth above) [***] ([***]%)
         [***].

13.      RETURNED GOODS POLICY

                  Cardinal will accept Merchandise for return from Pharmacies in
         accordance with the Standard Cardinal Returned Goods Policy (the
         "CARDINAL RETURNS POLICY") in effect from time to time. Cardinal will
         not accept for return any Merchandise from Buyer prior to execution of
         an Ongoing Assurances Form in the identical form as attached as an
         exhibit hereto. Cardinal will work with a third party returned goods
         processor in accordance with the Standard Third Party Returned Goods
         Policy (the "THIRD PARTY RETURNS POLICY") in effect from time to time.
         In connection with the Cardinal Returns

--------------------------------------------------------------------------------
                                        7
<PAGE>

         Policy and applicable law, Buyer will execute a Cardinal Health Return
         Goods Authorization Ongoing Assurance, in the form attached hereto as
         EXHIBIT E.

                  For [***], subject to the following conditions:

                  [***] and must be[***]
                  [***] and[***]
                  [***]
                  [***]
                  [***]percent ([***]%) [***].
                  [***].

14.      TERM

                  The initial term of this Agreement will be for a period of
         three (3) years beginning July 1, 2001 (the "COMMENCEMENT DATE").
         Thereafter, this Agreement shall automatically renew for two (2)
         additional one (1) year renewal terms, unless either party provides
         written notice of non-renewal at least ninety (90) days prior to the
         expiration of the initial term or the then current renewal term. The
         "initial term" and any "renewal terms" shall be referred to
         collectively as the "term."

                  Either party may effect an early termination of this Agreement
         upon the occurrence of a material breach by the other party and such
         party's failure to cure such material breach within ninety (90) days
         after the non-breaching party provides written notice thereof. For
         purposes of this Agreement, a lower-priced offer from a competitor of
         Cardinal to Buyer to provide the Merchandise and perform the services
         as set forth in this Agreement, shall not be deemed to, nor shall it
         constitute, a material breach of this Agreement by Cardinal, thereby
         permitting Buyer to terminate this Agreement pursuant to the provisions
         of this Section 14.

                  Notwithstanding the foregoing, with respect to payment
         defaults by Buyer, Cardinal may terminate this Agreement immediately.
         Buyer's obligation to pay Cardinal any amounts due hereunder shall
         survive termination of this Agreement.

15.      NOTICES

                  Any notice or other communication required or desired to be
         given to either party under this Agreement shall be in writing and
         shall be deemed given when: (a) received by the recipient, after being
         sent via certified mail, return receipt requested, and addressed to
         that party at the address for such party set forth at the end of this
         Agreement; (b) received by the recipient after being sent via Federal
         Express, Airborne, or any other similar overnight delivery service for
         delivery to that party at that address; or (c) received by facsimile
         transmission, as evidenced by electronic confirmation, to that party at
         its facsimile number set forth at the end of this Agreement. Either
         party may change its address or facsimile number for notices under this
         Agreement by giving the other party notice of such change.

--------------------------------------------------------------------------------
                                        8
<PAGE>

16.      TAXES/COMPLIANCE WITH LAWS

                  Buyer will pay when due any sales, use, excise, gross
         receipts, or other federal, state, or local taxes or other assessments
         (other than any tax based solely on the net income of Cardinal) and
         related interest and penalties in connection with or arising out of the
         transactions contemplated by this Agreement. If Cardinal pays any such
         amounts which Buyer is obligated to pay under this section, then Buyer
         will promptly reimburse Cardinal in an amount equal to the amount so
         paid by Cardinal.

                  If and to the extent any discount, credit, rebate or other
         purchase incentive (as set forth in the Pricing Matrix and this
         Agreement) is paid or applied by Cardinal with respect to the
         Merchandise purchased under this Agreement, such discount, credit,
         rebate or other purchase incentive shall constitute a "discount or
         other reduction in price," as such terms are defined under the
         Medicare/Medicaid Anti-Kickback Statute, on the Merchandise purchased
         by Buyer under the terms of this Agreement. Cardinal and Buyer agree to
         use their best efforts to comply with any and all requirements imposed
         on sellers and buyers, respectively, under 42 U.S.C. ss.
         1320a-7b(b)(3)(A) and the "safe harbor" regulations regarding discounts
         or other reductions in price set forth in 42 C.F.R. ss. 1001.952(h). In
         this regard, Buyer may have an obligation to accurately report, as may
         be required, under any state or federal program which provides cost or
         charge based reimbursement for the products or services covered by this
         Agreement, the net cost actually paid by Buyer.

17.      FORCE MAJEURE

                  Cardinal's obligations under this Agreement will be excused if
         and to the extent that any delay or failure to perform such obligations
         is due to fire or other casualty, product or material shortages,
         strikes or labor disputes, transportation delays, manufacturer
         out-of-stock or delivery disruptions, acts of God, seasonal supply
         disruptions, or other causes beyond the reasonable control of Cardinal.
         During the period of any such delay or failure, Buyer may purchase the
         Primary Wholesale Requirements for the affected Pharmacies from others,
         but will recommence purchasing from Cardinal upon cessation of such
         delay or failure; provided, however, that if such delay or failure
         continues for more than sixty (60) calendar days, Buyer shall have the
         right to immediately terminate this Agreement.

18.      RECORDS AND AUDIT

                  Cardinal will maintain records pertaining to this Agreement
         and the pharmaceutical products purchased by Buyer hereunder as
         required by applicable FDA requirements. Not more than once in any
         twelve (12) month period, and following sixty (60) days' advance
         written notice to Cardinal, Buyer will have the right to appoint one
         (1) or more of its employees to review those relevant records
         applicable to its pharmaceutical purchases for the sole purpose of
         verifying compliance with this Agreement, including but not limited to
         the pricing terms of this Agreement hereof; provided, however, any

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                                        9
<PAGE>

         information proprietary to Cardinal, as solely determined by Cardinal,
         shall be redacted from such records prior to review by Buyer, further
         provided, however, Cardinal shall ensure that Buyer receives the
         information necessary to verify compliance with this Agreement. Any
         such review will be limited to twelve (12) months of historical
         information as of the date such review begins and will be subject to a
         confidentiality agreement prepared by Cardinal and signed by the Buyer
         and its employee(s) who will have access to the information prior to
         beginning the review.

                  Cardinal will have the right to, following sixty (60) days'
         advance written notice to Buyer, appoint an independent auditor to
         review Buyer's purchase records in order to verify the growth rate of
         Buyer's purchase volume for purposes of the savings related to the
         [***].

19.      RETURN OF HARDWARE/SOFTWARE

                  Upon termination of this Agreement for any reason, Buyer's
         rights as a licensee of the CardinalCHOICE(R), CardinalCHOICE(R)-HQ or
         other Cardinal software will automatically expire, and Buyer will
         promptly return such software and any related, Cardinal-provided
         hardware not purchased by Buyer to a return location specified by
         Cardinal.

20.      ENTIRE AGREEMENT; SUCCESSORS

                  This Agreement and its exhibits constitutes the entire
         agreement and understanding of the parties with respect to the subject
         matter hereof, and supersedes all prior and contemporaneous agreements,
         proposals, bids/bid responses, and understandings between the parties
         relative to the subject matter of this Agreement. This Agreement will
         be governed by Ohio law. Neither Cardinal nor Buyer may assign its
         rights under this Agreement without the written consent of the other;
         provided, however, that either party may delegate its rights and
         obligations to any entity that is controlled by or under common control
         with the assigning party; provided that neither Cardinal nor Buyer
         shall be relieved of their respective liabilities and obligations
         hereunder in the event of such an assignment. This Agreement will be
         binding on, inure to the benefit of, and be enforceable by and against
         the respective successors and assigns of each party to this Agreement.

21.      AMENDMENTS

                  No changes to this Agreement will be made or be binding on any
         party unless made in writing and signed by each party to this
         Agreement.

22.      WAIVER

                  The failure of either party to enforce any provision of this
         Agreement will not be considered a waiver of any future right to
         enforce such provision.

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                                       10
<PAGE>

23.      ANNOUNCEMENTS

                  Neither party will issue any press release or other public
         announcement, verbally or in writing, referring to the other party or
         any entity which is controlled by or under common control with such
         other party, without such other party's prior written consent and
         advice of counsel. A written copy of any such press release or other
         public announcement will be provided to the other party no less than
         seventy-two (72) hours prior to the issuing party's intent to issue
         such release or announcement. The issuing party is responsible for
         confirming in writing that the other party has received any such
         proposed press release. Any such press release or other public
         announcement proposed by either party will be subject to the other
         party's revision and final approval. Nothing contained herein will
         limit the right of either party to issue a press release if, in the
         opinion of such party's counsel, a press release is required pursuant
         to state or federal securities laws, rules or regulations.

24.      CHANGE IN LAWS

                  Notwithstanding any other provision of this Agreement, if the
         governmental agencies that administer the Medicare, Medicaid, or other
         federal programs (or their representatives or agents), or any other
         federal, state, or local governmental or non-governmental agency, or
         any court or administrative tribunal passes, issues, or promulgates any
         law, rule, regulation, standard, interpretation, order, decision, or
         judgment, including, but not limited to, those relating to any
         regulation pursuant to state or federal anti-kickback or self-referral
         statutes (collectively or individually, "Change in Laws"), which, in
         the good faith judgment of a party to this Agreement (the "Noticing
         Party"), materially and adversely affects that party's license,
         accreditation, certification, or ability to refer, to accept any
         referral, to bill, to claim, to present a bill or claim, or to receive
         payment or reimbursement from any federal, state, or local governmental
         or non-governmental payor, or which subjects the Noticing Party to a
         risk of prosecution or civil monetary penalty, or which, in the good
         faith judgment of the Noticing Party, indicates a rule or regulation
         with which the Noticing Party desires further compliance and the Change
         in Laws has a material affect on the legality of this Agreement, or if
         Cardinal believes such Change in Laws may adversely affect Cardinal's
         financial position, then the Noticing Party may give the other party
         notice of intent to amend or terminate this Agreement. Such notice
         shall include an opinion of counsel stating: (i) the Change in Laws
         giving rise to the notice; (ii) the consequences of the Change in Laws
         as to the Noticing Party; (iii) the Noticing Party's intention either
         to terminate this Agreement due to an unacceptable risk of prosecution
         or civil monetary penalty or to amend this Agreement, together with a
         statement setting forth the specific purpose of the amendment as it
         relates to the legal compliance issue or risk that the Noticing Party
         seeks to address; (iv) the Noticing Party's proposed amendment(s); and
         (v) the Noticing Party's request for commencement of the Renegotiation
         Period (as hereinafter defined). If the notice provides for an
         amendment of this Agreement, the parties have ten (10) days from the
         giving of the notice ("Renegotiation Period") within which to attempt
         to amend this Agreement in accordance with the Noticing Party's
         proposal (if any) or otherwise as the parties may agree. If this
         Agreement is not amended within the Renegotiation Period,

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                                       11
<PAGE>

         this Agreement will automatically terminate as of midnight on the tenth
         (10th) day after notice was given, or as otherwise may be mutually
         agreed upon by the parties. Except as otherwise required by applicable
         law, any amounts then-owing to either party must be paid up to the date
         of termination, and any obligation under this Agreement that is to
         continue beyond expiration or termination must so continue pursuant to
         its terms. All opinions of counsel presented by the Noticing Party, and
         any corresponding opinions given by the other party are Confidential
         Information solely for purposes of renegotiation and settlement of a
         potential dispute, and must not be deemed disclosed so as to waive any
         privileges otherwise applicable to the opinions.

25.      DISPUTE RESOLUTION

                  Any dispute relating to this Agreement which the parties are
         unable to resolve by mutual agreement and meeting of the Executive
         Resolution Committee shall be settled by a sole arbitrator in a
         binding, non-reviewable and non-appealable alternative dispute
         resolution process conducted in accordance with the procedures set
         forth on EXHIBIT F. The existence of the dispute, the dispute
         resolution process, and the arbitrator's award shall be maintained
         confidential, provided that the arbitrator's award may be entered as a
         final judgment in any court having jurisdiction.

26.      EXECUTIVE RESOLUTION COMMITTEE

                  From time to time during the term of this Agreement, upon the
         request of either party, a panel consisting of two (2) executives from
         Buyer and two (2) executives from Cardinal (the "EXECUTIVE RESOLUTION
         COMMITTEE") will meet to review issues pertaining to this Agreement
         raised by either party, resolve disputes relating to this Agreement and
         address other issues as they may determine. Each executive on the
         Executive Resolution Committee shall be of the Senior Vice President
         level, or higher, and the identity of the executives from each party
         shall be determined based upon the issue or dispute presented. Except
         as otherwise set forth herein, the Executive Resolution Committee shall
         meet within forty-five (45) days of the request by either party. With
         respect to disputes, a copy of the terms of this Agreement, agreed upon
         facts and areas of disagreement, and a concise summary of the basis for
         each side's contentions will be provided to the Executive Resolution
         Committee who will review the same, confer, and attempt to reach a
         mutual resolution of the issue. If the Executive Resolution Committee
         is unable to reach a mutual resolution with regard to any dispute
         related to this Agreement, such dispute shall be settled in accordance
         with the dispute resolution process set forth in Section 25 of this
         Agreement.

27.      SEVERABILITY

                  Should, by any reason, any clause or provision of this
         Agreement be held or ruled unenforceable or ineffective under the law,
         such a ruling will in no way affect the validity or the enforceability
         of any other clause or provision contained herein.

28.      CONFIDENTIALITY

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                                       12
<PAGE>

                  Each party acknowledges that as a result of this Agreement,
         that party will learn confidential information of the other party. As
         used in this Agreement, the term "Confidential Information" includes
         all such information furnished by Cardinal or Buyer, any Pharmacy, or
         any of their respective representatives, to the other or its
         representatives, whether furnished before, on or after the date hereof
         and regardless of the manner in which it is furnished. Confidential
         Information includes all analyses, compilations, business or technical
         information and other materials prepared by Cardinal or Buyer, any
         Pharmacy, or any of their respective representatives, containing or
         based in whole or in part on any such information furnished by the
         other party or its representatives. Confidential Information also
         includes the existence of this Agreement and the terms and conditions
         hereof. Neither party will disclose any Confidential Information of the
         other party to any third party, or use, or permit any third party to
         use, any of such Confidential Information, excepting only: (a)
         disclosures on a confidential basis to and use by the directors,
         officers, employees, and agents of that party or its affiliates who
         have a reasonable need to know such information in connection with that
         party's performance of this Agreement, (b) disclosures which are
         required by law, as reasonably determined by that party or its legal
         counsel, or are made on a confidential basis to that party's attorneys,
         accountants, and other professional advisors in connection with matters
         relating to this Agreement, and (c) routine disclosures in the normal
         course of business, including to IMS/DDD or similar organizations and
         manufacturers.

                  The obligations of confidentiality hereunder will survive the
         termination of this Agreement for a period of three (3) years, unless
         otherwise mutually agreed upon by the parties. Upon termination of this
         Agreement (for any reason) each party will promptly: (i) return to the
         other party all documentation and other materials (including copies of
         original documentation or other materials) containing any confidential
         information of the other party; or (ii) certify to the other party,
         pursuant to a certificate in form and substance reasonably satisfactory
         to the other party, as to the destruction of all such documentation and
         other materials.

29.      COUNTERPARTS; FACSIMILE SIGNATURES

                  This Agreement may be executed in two or more counterparts,
         each of which shall be deemed an original, but all of which together
         shall constitute a single agreement. Each party acknowledges that a
         facsimile signature on this Agreement shall be binding upon such party.

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                                       13
<PAGE>

<TABLE>
<S>                                                           <C>

EXPRESS SCRIPTS, INC.                                         CARDINAL DISTRIBUTION*
13900 RIVERPORT DRIVE                                         7000 CARDINAL PLACE
MARYLAND HEIGHTS, MISSOURI 63043                              DUBLIN, OHIO 43017
FACSIMILE: (314) 702-7120                                     FACSIMILE: (614) 757-6000

BY /s/ Barrett Toan                                           BY /s/ Robert D. Walter
  ---------------------------------------------------           ---------------------------------------------------
NAME  Barrett Toan                                            NAME  Robert D. Walter
TITLE  Chairman and CEO                                       TITLE  Chairman and CEO
DATE   7/16/01                                                DATE   7/19/01
</TABLE>

*The term "CARDINAL  DISTRIBUTION"  will include the following  affiliated
operating  companies:  Cardinal Syracuse, Inc., a New York  corporation
(Syracuse,  New York);  James W. Daly,  Inc., a  Massachusetts  corporation
(Peabody, Massachusetts);  Ohio Valley-Clarksburg,  Inc., a Delaware corporation
(Wheeling, West Virginia); Cardinal Southeast, Inc. a Mississippi  corporation
(Madison,  Mississippi);  Whitmire Distribution  Corporation,  a Delaware
corporation (Folsom,  California);  Bindley Western Drug Company, an Indiana
corporation  (Indianapolis,  Indiana); and any other subsidiary of Cardinal
Health, Inc., an Ohio corporation ("CHI"), as may be designated by CHI.

--------------------------------------------------------------------------------
                                       14
<PAGE>

                                                                      EXHIBIT A

                                   PHARMACIES

Express Scripts, Inc.
14000 Riverport Drive
Maryland Heights, Missouri 63043

Express Scripts, Inc.
1700 North Desert Drive
Tempe, Arizona 85281

Express Scripts, Inc.
4500 Alexander Boulevard
Albuquerque, New Mexico 87107

Express Scripts, Inc.
3684 Marshall Lane
Bensalem, Pennsylvania 19020

Express Scripts, Inc.
433 River Street, Suite 800
Troy, New York 12180

Express Access Pharmacy, Inc.*
dba Express Scripts, Inc.
767 Electronic Drive
Horsham, Pennsylvania 19020

Express Scripts, Inc.
Specialty Distribution Service
3168 Riverport Tech Center
Maryland Heights, Missouri 63043

*This location will be subject to the terms and the conditions of this Agreement
upon termination of its existing supply agreement, which is approximately sixty
(60) days from the Commencement Date of this Agreement.

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                                       15
<PAGE>

                                                                      EXHIBIT B

                                 PRICING MATRIX

         1.       [***].  The [***] has been established based upon [***]

         (a)      [***];

         (b)      [***]($[***]); and

         (c)      [***]($[***]).

(collectively referred to herein as the [***]").  If, for any reason, [***].

         Subject to the [***] of this Agreement regarding [***](that is[***])
for [***]; provided, however, during the [***] of this Agreement, [***]%.

<TABLE>
         <S>                                                <C>
         -------------------------------------------------- -------------------------------------------------
                               [***]                                             [***]
         -------------------------------------------------- -------------------------------------------------
                          $[***] - [***]                                         [***]%
         -------------------------------------------------- -------------------------------------------------
                          $[***] - [***]                                         [***]%
         -------------------------------------------------- -------------------------------------------------
                          $[***] - [***]                                         [***]%
         -------------------------------------------------- -------------------------------------------------
                          $[***] - [***]                                         [***]%
         -------------------------------------------------- -------------------------------------------------
                              $[***]                                             [***]%
         -------------------------------------------------- -------------------------------------------------
</TABLE>

         This [***] and any [***]; provided, however, that such [***]. Any [***]
as a result of a[***] pursuant to the terms hereof shall be[***]. Any [***]
pursuant to the terms hereof shall be [***]. In all instances, [***] by this
Agreement, the [***].

         For example, [***].  If[***].  If[***].

2.       [***] of this Agreement regarding [***] (that is [***]) for[***].

3.        SPECIALLY PRICED MERCHANDISE. Notwithstanding the foregoing, the
following Merchandise will not be available for purchase in accordance with the
cost of goods set forth above, but instead will be special net billed:

         [***]
         [***]
         Certain [***]
         [***] subject to [***]
         Other [***]

4.       UP-FRONT DISCOUNT. Buyer shall be eligible to receive an up-front
discount on Buyer's purchases through Cardinal in the amount of [***] Dollars
($[***]) (the "DISCOUNT"). The

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                                       16
<PAGE>

Discount shall be payable within sixty (60) days after full execution of this
Agreement in the form of a check.

         If this Agreement is terminated prior to the end of the term, Buyer
shall repay to Cardinal, within sixty (60) days of the date of termination, a
pro rata amount (calculated based on a sixty (60) month term) of the Discount
paid to Buyer hereunder; provided, however, Buyer shall have no obligation to
repay to Cardinal any portion of the Discount if Buyer terminates this Agreement
due to Cardinal's material breach of this Agreement and failure to cure such
material breach in accordance with the terms of Section 14. The parties agree,
and Buyer acknowledges, that such payment by Buyer has been negotiated in good
faith and is not intended as a penalty.

5. [***]. During the term of this Agreement, [***]("[***]"). Cardinal [***] In
addition, [***], based upon a [***] ($[***]); provided, however, except as set
forth herein, [***] Dollars ($[***]) [***]; further provided, however, that
[***] shall be [***] In no event shall [***] Dollars ($[***]). If [***] Dollars
($[***]), [***] Dollars ($[***]), or the applicable [***] as set forth herein,
[***] For example, if during the first contract year, [***] Dollars ($[***]),
[***] Dollars ($[***]) ($[***] $[***]), or [***] Dollars ($[***])[***].

         If [***] as set forth above,[***]If [***] as set forth above during the
[***] Solely for purposes of this paragraph [***] as set forth above, [***] ,
shall be [***] (as hereinafter defined)); provided, however, in order for such
[***]

         Provided the [***] Dollars ($[***]), [***] percent ([***]) of all [***]
transactions hereunder ([***] only) ("[***]"). The [***] of the applicable[***].
All [***].

         In order to [***] the Commencement Date of this Agreement. Until [***]
of this Agreement; provided, however, if [***].

6. MEDICARE/MEDICAID DISCLOSURE. The Discount and [***] constitute a "discount
or other reduction in price," as such terms are defined under the
Medicare/Medicaid Anti-Kickback Statute, on the Merchandise purchased by Buyer
under the terms of this Agreement. Cardinal and Buyer agree to use their best
efforts to comply with any and all requirements imposed on sellers and buyers,
respectively, under 42 U.S.C. ss. 1320a-7b(b)(3)(A) and the "safe harbor"
regulations regarding discounts or other reductions in price set forth in 42
C.F.R. ss. 1001.952(h). In this regard, Buyer may have an obligation to
accurately report, as may be required, under any state or federal program which
provides cost or charge based reimbursement for the products or services covered
by this Agreement, the net cost actually paid by Buyer.

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                                       17
<PAGE>

                                                                      EXHIBIT C

                                      [***]

         During the term of this Agreement, [***] pursuant to the term and
conditions set forth below ("[***]").

[***] As a result of [***] and [***] with the terms and conditions of the [***]

                 Contract Year 1                    $[***]
                 Contract Year 2                    $[***]
                 Contract Year 3                    $[***]

                 Renewal Contract Year 4            $[***]
                 Renewal Contract Year 5            $[***]

         The [***] set forth above are based on [***] percent ([***]%) [***]
during the first contract year of this Agreement as the [***] percent ([***]%)
for contract years two (2) through five (5), [***].

         [***] in accordance with the provisions set forth below. Except as
otherwise set forth below, if, upon the completion of each contract year, [***]
set forth above, [***] as set forth below [***] ("[***]"). Any [***]

         [***] of this Agreement [***]. If this Agreement is [***] in which the
Agreement is [***], and the terms as set forth above shall be of [***].

[***] ("[***]") in accordance with the terms and conditions of this Agreement.
For purposes of the [***].

         For purposes of this Agreement, [***] as follows: [***] ([***]%) [***]
set forth below [***] as set forth herein]. The [***] Rx Products [***] or BTC
and [***]; provided, the [***] Rx Products [***] ([***]%) [***] Rx Products
[***]

         The [***] as it relates to [***], as well as [***] on the information
provided to [***] as set forth herein.

         During the term of this Agreement, [***]

         For [***], who, in turn, will [***]. Upon [***]. Upon [***] (i.e.,
[***]). If [***] as set forth above, will be included in the [***] will be as
determined by [***]

         [***]

         [***]

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                                       18
<PAGE>

         [***] ([***]%), based on the [***] or the applicable [***], for all
[***] of the following month. [***] hereunder will be included in the [***]

         Within [***] set forth above, [***] as set forth below:

<TABLE>
                <S>                                         <C>
                ------------------------------------------- ------------------------------------------
                                  [***]                                       [***]
                ------------------------------------------- ------------------------------------------
                                  [***]%                                     [***]%
                ------------------------------------------- ------------------------------------------
                             [***]% - [***]%                                 [***]%
                ------------------------------------------- ------------------------------------------
                             [***]% - [***]%                                 [***]%
                ------------------------------------------- ------------------------------------------
                             [***]% - [***]%                                 [***]%
                ------------------------------------------- ------------------------------------------
                                  [***]%                                     [***]%
                ------------------------------------------- ------------------------------------------

</TABLE>

         [***]

         [***]

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                                       19
<PAGE>

                                                                      EXHIBIT D

                                 OTHER SERVICES

HARDWARE/SOFTWARE

          [***], pursuant to the provision of Cardinal's Software License
  Agreement, [***] CardinalCHOICE(R) unit ([***]) [***] CardinalCHOICE(R)-HQ
  ([***]) Any such [***] shall remain the [***] of this Agreement, or upon [***]

         Upon termination of this Agreement for any reason, Buyer's or any
Pharmacy's rights as a licensee of the CardinalCHOICE(R), CardinalCHOICE(R)-HQ
or other Cardinal software will automatically expire, and Buyer and each
Pharmacy will promptly return such software and any hardware provided hereunder
not purchased by Buyer or any Pharmacy to a return location specified by
Cardinal.

         Cardinal will license to Buyer, pursuant to the provision of Cardinal's
Software License Agreement, its eReceiver Systems available to the Pharmacies
pursuant to Cardinal's customary terms and practices.

ON-SITE EMPLOYEE

         During the term of this Agreement, [***] employee [***] The employee
will be [***] The provision of this employee [***] and relates solely to this
Agreement. [***] such employee[***] such employee [***] During the term of this
Agreement, [***] such employee [***] such employee [***] The employee will be
[***] with this Agreement; provided, however, that such employee will [***]
employee of [***] such employee [***] the Commencement Date of this Agreement.

SPONSORSHIP OF BUYER'S OUTCOMES SEMINAR

         [***]

[***]

         [***]

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                                       20
<PAGE>

                                                                      EXHIBIT E

                   CARDINAL HEALTH RETURN GOODS AUTHORIZATION
                                ONGOING ASSURANCE

The undersigned Buyer ("BUYER") of one (1) or more of the Cardinal Health
companies identified below ("WHOLESALER," whether one (1) or more) hereby agrees
that this document is being delivered to confirm Buyer's compliance with
applicable federal, state, and local laws / guidelines concerning returned goods
and will apply to all returns by Buyer to Wholesaler from time to time and will
supersede any inconsistent provisions which may be contained in any credit
request, purchase order, or other documents pertaining to the supply
relationship between Buyer and Wholesaler.

1. Buyer represents, warrants, and guarantees to Wholesaler that: (a) each such
return will be made only to the specific Wholesaler from which the item was
originally purchased; (b) each such return will be accompanied by Wholesaler's
credit request form (the "RETURN FORM"), which will specify both Buyer's and
Wholesaler's name and address, the date of the return, the quantity and
description of the product returned, and such other information as may
reasonably be requested on Wholesaler's Return Form; (c) Buyer will retain a
copy of each Return Form and related credit memo and make such documentation
available to the manufacturer and to authorized federal, state, and local law
enforcement officers upon request; (d) the credit claimed or accepted by Buyer
for any such return will not exceed the original purchase price paid to
Wholesaler; and (e) all merchandise returned to Wholesaler has been stored and
handled by Buyer in accordance with all applicable federal, state, and local
laws, manufacturer guidelines when disclosed to Buyer by the manufacturer or
wholesaler, and good trade practices, and such merchandise has not been
adulterated or misbranded by Buyer within the meaning of the Federal Food, Drug,
and Cosmetic Act and meets all FDA, state, and other applicable requirements and
guidelines.

2. Buyer will indemnify and defend Wholesaler against and from any expense,
claim, liability, or penalty (including reasonable legal fees) arising from any
failure of Buyer to properly comply with the provisions specified in this
exhibit.

3. The term "CARDINAL HEALTH" or "WHOLESALER" will include the following
affiliated operating companies: Cardinal Syracuse, Inc., a New York corporation
(Syracuse, New York); James W. Daly, Inc., a Massachusetts corporation (Peabody,
Massachusetts); Ohio Valley-Clarksburg, Inc., a Delaware corporation (Wheeling,
West Virginia); Cardinal Southeast, Inc. a Mississippi corporation (Madison,
Mississippi); Whitmire Distribution Corporation, a Delaware corporation (Folsom,
California); Bindley Western Drug Company, an Indiana corporation (Indianapolis,
Indiana); and any other subsidiary of Cardinal Health, Inc., an Ohio corporation
("CHI"), as may be designated by CHI.

                                           EXPRESS SCRIPTS, INC.

                                           ------------------------------------
Dated:                       , 2001        By Authorized Signature / Title
      ------------------------

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                                       21
<PAGE>

                                                                      EXHIBIT E

                         ALTERNATIVE DISPUTE RESOLUTION

(a)      The parties recognize that a bona fide dispute as to certain matters
         may arise from time to time during the term of this Agreement which
         relates to either party's rights and/or obligations. To have such a
         dispute resolved by this Alternative Dispute Resolution ("ADR")
         provision, the parties first must attempt to resolve the dispute with
         the Executive Resolution Committee in accordance with Section 26 of the
         Agreement. Any negotiations regarding a dispute shall be treated as
         settlement negotiations for purposes of the Federal Rules of Evidence
         and any similar state rules of evidence. Such negotiations shall not be
         admissible in any subsequent ADR hearing. If the matter has not been
         resolved by the Executive Resolution Committee within forty-five (45)
         days of the notice of dispute, or such shorter period as set forth in
         the Agreement, or if the parties fail to meet within such forty-five
         (45) days, or such shorter period as set forth in the Agreement, either
         party may initiate an ADR proceeding as provided herein. The parties
         shall have the right to be represented by counsel in such a proceeding.

(b)      To begin an ADR proceeding, a party shall provide written notice to the
         other party of the issues to be resolved by ADR. Within fourteen (14)
         days after its receipt of such notice, the other party may, by written
         notice to the party initiating the ADR, add additional issues to be
         resolved within the same ADR.

(c)      The ADR proceeding and the resolution of any disputes in the ADR
         proceeding shall be conducted by a panel of three neutrals. Within
         twenty-one (21) days following receipt of the original ADR notice, the
         parties shall each select one neutral, and the American Arbitration
         Association shall select one neutral pursuant to the following
         procedures:

         (1)      The AAA shall submit to the parties a list of not less than
                  five (5) candidates within fourteen (14) days after receipt of
                  the original ADR notice, along with a Curriculum Vitae for
                  each candidate. No candidate shall be an employee, director,
                  or shareholder of either party or any of their subsidiaries or
                  Affiliates.

         (2)      Such list shall include a statement of disclosure by each
                  candidate of any circumstances likely to affect his or her
                  impartiality.

         (3)      Each party shall number the candidates in order of preference
                  (with the number one (1) signifying the greatest preference)
                  and shall deliver the list to the AAA within seven (7) days
                  following receipt of the list of candidates. If a party
                  believes a conflict of interest exists regarding any of the
                  candidates, that party shall provide a written explanation of
                  the conflict to the AAA along with its list showing its order
                  of preference for the candidates. Any party failing to return
                  a list of preferences on time shall be deemed to have no order
                  of preference.

         (4)      If the parties collectively have identified fewer than three
                  (3) candidates deemed to have conflicts, the AAA immediately
                  shall designate as the neutral the

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                                       22
<PAGE>

                  candidate who has no conflicts and for whom the parties
                  collectively have indicated the greatest preference. If a tie
                  should result between two candidates, the AAA may designate
                  either candidate. If the parties collectively have identified
                  three (3) or more candidates deemed to have conflicts, the AAA
                  shall review the explanations regarding conflicts and, in its
                  sole discretion, may either (I) immediately designate as the
                  neutral the candidate who has no conflicts and for whom the
                  parties collectively have indicated the greatest preference,
                  or (ii) issue a new list of not less than five (5) candidates,
                  in which case the procedures set forth in subparagraphs (c)(1)
                  - (4) shall be repeated.

(d)      No earlier than twenty-eight (28) days or later than fifty-six (56)
         days after selection, the panel of neutrals shall hold a hearing to
         resolve each of the issues identified by the parties. The ADR
         proceeding shall take place at a location, other than the principal
         place of business of either party or any of their subsidiaries or
         affiliates, as designated by the panel of neutrals.

(e)      At least seven (7) days prior to the hearing, each party shall submit
         the following to the other party and the panel of neutrals:

         (1)      a copy of all exhibits on which such party intends to rely in
                  any oral or written presentation to the panel of neutrals;

         (2)      a list of any witnesses such party intends to call at the
                  hearing, and a short summary of the anticipated testimony of
                  each witness;

         (3)      a proposed ruling on each issue to be resolved, together with
                  a request for a specific damage award or other remedy for each
                  issue. The proposed rulings and remedies shall not contain any
                  recitation of the facts or any legal arguments and shall not
                  exceed one (1) page per issue.

         (4)      a brief in support of such party's proposed rulings and
                  remedies, provided that the brief shall not exceed twenty (20)
                  pages. This page limitation shall apply regardless of the
                  number of issues raised in the ADR proceeding.

                  Except as expressly set forth in subparagraphs (e)(1) - (4),
                  no discovery shall be required or permitted by any means,
                  including depositions, interrogatories, requests for
                  admissions, or production of documents.

(f)      The hearing shall be conducted on two (2) consecutive days and shall be
         governed by the following rules:

         (1)      Each party shall be entitled to five (5) hours of hearing time
                  to present its case. The panel of neutrals shall determine
                  whether each party has had the five (5) hours to which it is
                  entitled.

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                                       23
<PAGE>

         (2)      Each party shall be entitled, but not required, to make an
                  opening statement, to present regular and rebuttal testimony,
                  documents or other evidence, to cross-examine witnesses, and
                  to make a closing argument. Cross-examination of witnesses
                  shall occur immediately after their direct testimony, and
                  cross-examination time shall be charged against the party
                  conducting the cross-examination.

         (3)      The party initiating the ADR shall begin the hearing and, if
                  it chooses to make an opening statement, shall address not
                  only issues it raised but also any issues raised by the
                  responding party. The responding party, if it chooses to make
                  an opening statement, also shall address all issues raised in
                  the ADR. Thereafter, the presentation of regular and rebuttal
                  testimony and documents, other evidence, and closing arguments
                  shall proceed in the same sequence.

         (4)      Except when testifying, witnesses shall be excluded from the
                  hearing until closing arguments.

         (5)      Settlement negotiations shall not be admissible under any
                  circumstances. Affidavits prepared for purposes of the ADR
                  hearing also shall not be admissible. As to all other matters,
                  the panel of neutrals shall have sole discretion regarding the
                  admissibility of any evidence.

(g)      Within seven (7) days following completion of the hearing, each party
         may submit to the other party and the panel of neutrals a post-hearing
         brief in support of its proposed rulings and remedies, provided that
         such brief shall not contain or discuss any new evidence and shall not
         exceed ten (10) pages. This page limitation shall apply regardless of
         the number of issues raised in the ADR proceeding.

(h)      The panel of neutrals shall rule on each disputed issue within fourteen
         (14) days following completion of the hearing. Such ruling shall adopt
         in its entirety the proposed ruling and remedy of one of the parties on
         each disputed issue but may adopt one party's proposed rulings and
         remedies on some issues and the other party's proposed rulings and
         remedies on other issues. The panel of neutrals shall not issue any
         written opinion or otherwise explain the basis of the ruling.

(i)      The panel of neutrals shall be paid a reasonable fee plus expenses.
         These fees and expenses, along with the reasonable legal fees and
         expenses of the prevailing party (including all expert witness fees and
         expenses), the fees and expenses of a court reporter, and any expenses
         for a hearing room, shall be paid as follows:

         (1)      If the panel of neutrals rules in favor of one party on all
                  disputed issues in the ADR, the losing party shall pay 100% of
                  such fees and expenses.

         (2)      If the panel of neutrals rules in favor of one party on some
                  issues and the other party on other issues, the panel of
                  neutrals shall issue with the rulings a written determination
                  as to how such fees and expenses shall be allocated between

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                                       24
<PAGE>

                  the parties. The panel of neutrals shall allocate fees and
                  expenses in a way that bears a reasonable relationship to the
                  outcome of the ADR, with the party prevailing on more issues,
                  or on issues of greater value or gravity, recovering a
                  relatively larger share of its legal fees and expenses.

(j)      The rulings of the panel of neutrals and the allocation of fees and
         expenses shall be binding, non-reviewable, and non-appealable, and may
         be entered as a final judgment in any court having jurisdiction.

(k) Except as provided in paragraph (j) or as required by law, the existence of
the dispute, any settlement negotiations, the ADR hearing, any submissions
(including exhibits, testimony, proposed rulings, and briefs), and the rulings
shall be deemed Confidential Information. The panel of neutrals shall have the
authority to impose sanctions for unauthorized disclosure of Confidential
Information.

(l)      Except as otherwise set forth herein the ADR proceedings shall be
         governed in accordance with the AAA rules.

(m)      All references to days in this Exhibit F shall mean calendar days.

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                                       25
<PAGE>

                               FIRST AMENDMENT TO
                             PRIME VENDOR AGREEMENT

         THIS FIRST AMENDMENT TO PRIME VENDOR AGREEMENT ("FIRST AMENDMENT") is
among Cardinal Distribution* ("CARDINAL"), and Express Scripts, Inc. ("BUYER").

         WHEREAS, Cardinal and Buyer executed a Prime Vendor Agreement, dated
July 1, 2001 (the "AGREEMENT").

         WHEREAS, Buyer desires to discontinue purchasing certain [***] Products
directly from the applicable manufacturers and/or suppliers and commence
purchasing such [***] Products through Cardinal.

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

         NOW THEREFORE, in consideration of the foregoing recitals, the parties
hereby agree as follows:

         1. SECTION 2, SALE OF MERCHANDISE. The definition of "PRIMARY WHOLESALE
REQUIREMENTS" shall be deleted in its entirety and replaced with the following:
"The term `PRIMARY REQUIREMENTS' means that Buyer will purchase for each
Pharmacy [***] of its requirements of [***] Products that are available from
Cardinal from Cardinal. If Cardinal notifies Buyer (such notice to be provided
at the time of order confirmation) that it will be unable to supply any
[***]Product within forty-eight (48) hours of Buyer's order of such [***]
Product, Buyer may purchase such [***] Product from another supplier, including,
but not limited to alternate source vendors, and such purchases shall be
included in the calculations of Buyer's Qualified Annual and Monthly Purchases
for the purpose of determining Buyer's compliance with the Minimum Requirements
(as hereinafter defined) and Buyer's applicable cost of goods; provided,
however, Buyer shall provide to Cardinal reasonable documentation of the [***]
Products purchased from other suppliers and that Buyer attempted to purchase
such [***] Products from Cardinal and they were unavailable within forty-eight
(48) hours." Further, all references to the term "PRIMARY WHOLESALE
REQUIREMENTS" in the Agreement shall be deleted and replaced with the term
"PRIMARY REQUIREMENTS".

         The following paragraph shall be deleted from Section 2, Sale of
Merchandise: "Cardinal acknowledges that Buyer, [***]."

         2. SECTION 3, PURCHASE PRICE. The last paragraph of Section 3, Purchase
Price, shall be deleted in its entirety and replaced with the following: "All
[***] CardinalCHOICE(R)pharmacy system [***] the pricing specified in the
Pricing Matrix; provided, however, [***]

         3. SECTION 4, [***] AND SAVINGS AND EXHIBIT C. Section 4, [***] and
Savings, and Exhibit C, [***] and Related Savings, shall be deleted in their
entirety.

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                                       26
<PAGE>

         4. SECTION 5, PAYMENT TERMS. The following additional payment terms
shall be added to Section 5(a)(i) for Direct Store Delivery Purchases:

         (a) [***] Buyer will cause Cardinal to receive payment in full by [***]
of the amount due for all Merchandise delivered and services provided during the
[***]

         (b) [***] Buyer will cause Cardinal to receive payment in full: (1) by
not later than the [***] day of each calendar month of the amount due for all
Merchandise delivered and services provided during the first (1st) [***] days of
such calendar month; (2) by not later than the [***] day of each calendar month,
of the amount due for all Merchandise delivered and services provided during the
[***] through the [***] day of such calendar month; and (3) by not later than
the [***] day of each calendar month, of the amount due for all Merchandise
delivered and services provided during the period beginning on the [***] day of
the preceding calendar month and ending on the last day of such preceding
calendar month.

         Sections 5(a)(ii) and (iii) shall be deleted in their entirety.

         5. SECTION 6, ORDERING AND DELIVERY. The third sentence of Section 6,
Ordering and Delivery, shall be amended to add the Pharmacies located in
Bensalem, Pennsylvania; East Hanover, New Jersey; and Harrisburg, Pennsylvania.

         In addition, the fourth sentence shall be deleted in its entirety and
replaced with the following: "Buyer will incur a separate delivery charge, not
to exceed Cardinal's actual cost for courier delivery, for additional deliveries
(beyond [***] )."

         6. EXHIBIT B, PRICING MATRIX. Section 1 of Exhibit B, Pricing Matrix,
shall be deleted in its entirety and replaced with Section 1 of Exhibit A
attached to this Amendment.

         Section 2, Brokerage Purchases, of Exhibit B, Pricing Matrix, shall be
deleted in its entirety.

         Section 5, Generic Outsource Program Rebate, of Exhibit B, Pricing
Matrix, shall be deleted in its entirety.

         7. EXHIBIT D, OTHER SERVICES. The paragraph titled, [***], shall be
deleted in its entirety from Exhibit D, Other Services.

         8. SECTION 12, SERVICE LEVEL. Section 12, Service Level, shall be
deleted in its entirety and replaced with the following:

         "Cardinal will exercise all reasonable efforts to provide [***]
         (excluding Buyer's Top [***] Items (as hereinafter defined)) [***]
         ([***]%) [***] in accordance with the standards and procedures
         specified in AMENDMENT EXHIBIT B attached hereto. For Buyer's Top [***]
         Items, Cardinal will exercise all reasonable efforts to provide each
         Pharmacy with an average monthly service level of at least [***]
         ([***]%) calculated quarterly (calendar) in accordance with the
         standards and procedures specified in AMENDMENT EXHIBIT B attached
         hereto.

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                                       27
<PAGE>

         Buyer's "Top [***] Items" means the top [***]Rx Products purchased by
         Buyer based on Rx count. Buyer will provide to Cardinal a report of the
         "Top [***] Items" on a quarterly (calendar) basis for purposes of
         measuring the service level on such items the following calendar
         quarter. [***] ([***]%) [***] ([***]%) [***] ([***]%) [***] ([***]%)
         [***] ([***]%), [***]. For example, [***] $[***] % [***] $ [***]
         ([***]) [***]% - [***]% = [***] % and ([***]) [***]% x $[***] x [***]%
         = $[***].

         Notwithstanding [***] in accordance with the standards and procedures
     specified in AMENDMENT EXHIBIT B attached hereto is [***] ([***]%) [***]
     ([***]%) [***] as set forth above) [***] ([***]%) [***] ([***]%) [***]."

         9. EXHIBIT A, PHARMACIES. Exhibit A is hereby amended to add the
following additional Pharmacies:

         Central Fill, Inc.
         4415 Lewis Road
         Harrisburg, Pennsylvania 17111

         Central Fill, Inc.
         721 Ridgedale Avenue
         East Hanover, New Jersey 07936

         ESI Mail Pharmacy Service, Inc.
         7909 South Hardy
         Tempe, Arizona 85284

         10. MISCELLANEOUS. Capitalized terms not defined herein will have the
same meaning ascribed to them in the Agreement, it being the intent of the
parties that the Agreement and this First Amendment will be applied and
construed as a single instrument. The Agreement, as modified by this First
Amendment, constitutes the entire agreement between Cardinal and Buyer regarding
the subject matter of the Agreement and this First Amendment and supersedes all
prior or contemporaneous writings and understandings between the parties
regarding the same. This First Amendment will be binding upon the parties, their
heirs, legal representatives, successors and assigns. The terms and provisions
of this First Amendment are severable. If any term or provision of this First
Amendment is determined to be illegal or unenforceable by a court of competent
jurisdiction, the remaining terms and provisions of this First Amendment and the
Agreement will remain in full force and effect. This First Amendment may only be
amended in a writing signed by Cardinal and Buyer.

         11. EFFECTIVE DATE. This First Amendment shall be effective as of the
date of full execution ("EFFECTIVE Date"). Except as otherwise amended herein,
the terms and conditions of the Restated Agreement shall remain in full force
and effect.

<TABLE>
CARDINAL DISTRIBUTION*                      EXPRESS SCRIPTS, INC.

<S>                                                  <C>
BY:  /s/ Mark Parrish                                 BY:  /s/ George Paz
    --------------------------                            ------------------------------
</TABLE>

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                                       28
<PAGE>

<TABLE>
<S>                                                  <C>
NAME:   Mark Parrish                                 NAME:    George Paz
TITLE:  President                                    TITLE:   CFO
DATE:   1/15/03                                      DATE:    1/9/03
</TABLE>

*The term "Cardinal Distribution" shall include the following affiliated
operating companies: James W. Daly, Inc., a Massachusetts corporation (Peabody,
Massachusetts) (now known as "Cardinal Health 106, Inc."); Cardinal Southeast,
Inc. a Mississippi corporation (Madison, Mississippi) (now known as "Cardinal
Health 103, Inc."); Whitmire Distribution Corporation, a Delaware corporation
(Folsom, California) (now known as "Cardinal Health 110, Inc."); Bindley Western
Industries, Inc., a Indiana corporation (Indianapolis, Indiana) (now known as
"Cardinal Health 100, Inc."); and any other subsidiary of Cardinal Health, Inc.,
an Ohio corporation ("CHI"), as may be designated by CHI.

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                                       29
<PAGE>

                                                                      EXHIBIT A

1.       [***].  The [***] has been established based upon [***]:

(a)      [***];

(b)      [***] Dollars ($[***]); and

(c)      [***] Dollars ($[***]).

(collectively referred to herein as the [***]. If, for any reason, [***] Dollars
($[***]) [***] beginning on the Commencement Date of this Agreement

      Subject to the [***] of this Agreement regarding [***] (that is [***]) for
[***]; provided, however, until all Pharmacies are converted to purchasing their
Primary Requirements from Cardinal, the applicable price for the Harrisburg, PA,
East Hanover, NJ and Specialty Distribution Service (Maryland Heights, MO)
Pharmacies will be equal to [***] (as defined in the Agreement) [***] provided,
however, conversion of all Pharmacies shall be completed within six (6) months
following the first day of the conversion of the first Pharmacy. The remaining
Pharmacies will continue to purchase at their current pricing until converted,
at which time they will move to the [***]

<TABLE>
<S>                                                 <C>                   <C>                    <C>
--------------------------------------------------- --------------------- ---------------------- ---------------------
                      [***]                                [***]                  [***]                 [***]
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                           [***]%                [***]%                 [***]%
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                           [***]%                [***]%                 [***]%
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                           [***]%                [***]%                 [***]%
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                           [***]%                [***]%                 [***]%
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                           [***]%                [***]%                 [***]%
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                           [***]%                [***]%                 [***]%
--------------------------------------------------- --------------------- ---------------------- ---------------------
                  $[***] - [***]                                                  [***]
--------------------------------------------------- --------------------- ---------------------- ---------------------
</TABLE>

         Upon completion of the conversion of all Pharmacies or achievement of
at least [***] Dollars ($[***]) in total [***], whichever is earlier, the next
[***] will be annualized to determine the applicable pricing tier for all fully
converted Pharmacies. Such pricing will be effective on the [***] of the next
[***]. For example, if all conversions are completed in [***] to determine the
applicable price beginning on [***]. Such pricing will continue until a full
[***] can be reviewed. The pricing will be adjusted on the [***] of the [***].
For example, [***] for [***] will be reviewed with the next [***]. Thereafter,
[***] will be reviewed on a [***] basis and any [***] based on [***] days during
such [***]; provided, however, that such [***] of the [***]. In all instances,
[***]. For example, [***].

         The pricing set forth on this Exhibit A [***] (as hereinafter defined)
[***] that include, but are not limited to, [***] In the event that [***] during
the term of this Agreement [***] or in the event that [***], then [***] In such
event, [***]. If the [***]; provided, however, [***] shall be [***].

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                                       30
<PAGE>

                                                            AMENDMENT EXHIBIT B

                            SERVICE LEVEL DEFINITION

         For purposes of this Agreement, the service level percentage will be
calculated by dividing total lines of Rx Products shipped by the number of lines
of Rx Products ordered. The following items will be excluded from the service
level calculation:

         1.       [***]
         2.       [***] items [***];
         3.       [***];
         4.       Items where a Facility has [***];
         5.       Items where a Facility's [***]; and
         6.       [***] item [***].

         The service level for each Pharmacy will commence fourteen days (14)
days following the later of such Pharmacy's initial order of Merchandise under
this Amendment from Cardinal or Cardinal's receipt of accurate usage data from
such Pharmacy. The service level for Facilities added to this Agreement after
the Commencement Date will commence fourteen (14) days following receipt by
Cardinal of accurate usage data. This will allow Cardinal to gain usage
information and adjust inventory levels appropriately.

         Upon Buyer's request, if Cardinal does not meet its service level for
any quarter, Cardinal and Buyer will jointly develop a service level action plan
for the following quarter.

         Buyer will notify Cardinal at least forty-five (45) days prior to the
expiration of any manufacturer's contract which is being replaced with a
different contract, and will cooperate with and assist Cardinal in disposing of
any excess inventory of Merchandise previously stocked at Buyer's or a
Facility's request. Failure to comply with these notice requirements will
entitle Cardinal to discontinue the service level to the Facilities until ninety
(90) days after delivery of accurate usage data for the new items.

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                                       31

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