EX-10.1





 Exhibit 10.1 

EXHIBIT D 
 FORM OF
CONTINGENT VALUE RIGHTS AGREEMENT 
 THIS CONTINGENT VALUE RIGHTS AGREEMENT, dated as of [●], 2020 (this
“Agreement”), is entered into by and between La Jolla Pharmaceutical Company, a California corporation (“Parent”), and [●]1, as Rights Agent (the
“Rights Agent”). 
 RECITALS 

WHEREAS, Parent, TTP Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of Parent (“Merger Sub”),
and Tetraphase Pharmaceuticals, Inc., a Delaware corporation (including in its capacity as the surviving corporation in the Merger, the “Company”), have entered into an Agreement and Plan of Merger dated as of June [●], 2020
(as it may be amended or supplemented from time to time pursuant to the terms thereof, the “Merger Agreement”); 

WHEREAS, capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement; 

WHEREAS, pursuant to the Merger Agreement, Merger Sub has agreed to commence a tender offer (the “Offer”) to purchase
all of the outstanding shares of Company Common Stock in exchange for: (i) the Cash Consideration, and (ii) one contingent value right per Share, as hereinafter described (together with the Cash Consideration, the
“Consideration”); 
 WHEREAS, following completion of the Offer, at the Effective Time, Merger Sub will merge with
and into the Company (the “Merger”), with the Company continuing as the surviving corporation and as a wholly owned subsidiary of Parent; 

WHEREAS, pursuant to and on the terms set forth in the Merger Agreement, each Share shall be converted at the Effective Time into the
right to receive the Consideration, including the contingent value rights as hereinafter described; and 
 WHEREAS, the Rights Agent
is willing to act in connection with the issuance, transfer, exchange and payment of such contingent value rights as provided herein. 

NOW, THEREFORE, in consideration of the premises and mutual agreements herein, Parent and the Rights Agent hereby agree as follows:

 1.    DEFINITIONS 

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

 
  

	1 	 Note to Draft: Rights Agent to be determined in accordance with the Merger Agreement.















 “Acting Holders” means, at the time of determination, Holders of at least
40% of the outstanding CVRs as set forth on the CVR Register. 
 “Affiliate” means, with respect to any specified Person,
any other Person that, directly or indirectly, through one or more intermediaries, controls, is controlled by or is under common control with such specified Person; “control” means the ownership, directly or indirectly, of more than 50% of
the voting securities entitled to vote for the directors (or similar officials) of a Person or the possession, by contract or otherwise, of the authority to direct the management and policies of a Person. 

“Calendar Quarter” means each period of three consecutive months commencing on January 1, April 1, July 1 and
October 1 of each calendar year. 
 “Calendar Year” means the period of four consecutive Calendar Quarters beginning
on January 1 and ending on December 31 of each calendar year. 
 “Change of Control” means (i) a sale or
other disposition of all or substantially all of the assets of either Parent or the Company on a consolidated basis (other than to any direct or indirect wholly owned subsidiary of Parent), (ii) a merger or consolidation involving either Parent or
the Company in which Parent or the Company, respectively, is not the surviving entity, and (iii) any other transaction involving either Parent or the Company in which Parent or the Company, respectively, is the surviving entity but in which the
stockholders of Parent or the Company, respectively, immediately prior to such transaction own less than fifty percent (50%) of the surviving entity’s voting power immediately after the transaction, other than any bona fide equity
financing transaction solely related to the continued financing of the operations of Parent and its subsidiaries. 
 “Commercially
Reasonable Efforts” means, with respect to a task related to a product, the efforts required to carry out such task in a diligent and sustained manner without undue interruption, pause or delay, which level is at least commensurate with the
level of efforts that a pharmaceutical company of comparable size and resources as those of Parent and its controlled Affiliates would devote to a product of similar potential (including commercial potential), taking into account its proprietary
position and profitability (including pricing and reimbursement status, but excluding the obligation to pay the Milestone Amounts under this Agreement), anticipated or actual market conditions and economic return potential, the regulatory
environment, and other relevant technical, commercial, legal, scientific and/or medical factors. 
 “CVRs” means the rights
of Holders to receive contingent payments of cash pursuant to the Merger Agreement and this Agreement. 
 “CVR Register”
has the meaning set forth in Section 2.3(b). 
 “DTC” means The Depository Trust Company or any successor entity
thereto. 
 “Event of Default” has the meaning set forth in Section 6.1(a). 

“Holder” means a Person in whose name a CVR is registered in the CVR Register at the applicable time. 

  
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 “Independent Accountant” has the meaning set forth in Section 4.5(a).

 “Licensee” means any non-Affiliate third party granted a license by Parent or
its Affiliates under the Company IP to make, have made, use, sell, offer for sale, or import XERAVA in the U.S., but shall exclude any (i) third party distributor of XERAVA that has no royalty or other payment obligations to any Parent or any
of its Affiliates that are calculated based on amounts invoiced or received by such third party for sales of XERAVA or (ii) a third party distributor of XERAVA that (x) does not take title to XERAVA, (y) does not invoice XERAVA sales
to third party customers and (z) is responsible only for inventory management and distribution with respect XERAVA on behalf of Parent or its Affiliates. 

“Milestone” means each of Milestone 1, Milestone 2 and Milestone 3. 

“Milestone 1” means the first achievement of annual Net Sales of at least $20,000,000 during the Calendar Year ending on
December 31, 2021. 
 “Milestone 2” means the first achievement of annual Net Sales of at least $35,000,000 during any
Calendar Year ending on or before December 31, 2024. 
 “Milestone 3” means the first achievement of annual Net Sales
of at least $55,000,000 during any calendar year ending on or before December 31, 2024. 
 “Milestone Amount” means
each of Milestone 1 Amount, Milestone 2 Amount and Milestone 3 Amount. 
 “Milestone 1 Amount” means, with respect to the
achievement of Milestone 1, an amount per CVR equal to the quotient of $2,500,000, divided by the aggregate number of CVRs issued pursuant to the Merger Agreement and this Agreement, without interest (it being understood and agreed that all
Milestones or a combination of any two Milestones can be earned in the same year, in which case all such applicable Milestone Amounts shall be payable). 

“Milestone 2 Amount” means, with respect to the achievement of Milestone 2, an amount per CVR equal to the quotient of
$4,500,000, divided by the aggregate number of CVRs issued pursuant to the Merger Agreement and this Agreement, without interest (it being understood and agreed that all Milestones or a combination of any two Milestones can be earned in the same
year, in which case all such applicable Milestone Amounts shall be payable). 
 “Milestone 3 Amount” means, with respect to
the achievement of Milestone 3, an amount per CVR equal to the quotient of $9,000,000, divided by the aggregate number of CVRs issued pursuant to the Merger Agreement and this Agreement, without interest (it being understood and agreed that all
Milestones or a combination of any two Milestones can be earned in the same year, in which case all such applicable Milestone Amounts shall be payable). 

“Milestone Cap” means $16,000,000. 

“Milestone Non-Achievement Certificate” has the meaning set forth in
Section 2.4(e). 
 “Milestone Notice” has the meaning set forth in Section 2.4(a)(i). 

  
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 “Milestone Payment Date” has the meaning set forth in Section 2.4(a).

 “Net Sales” means the gross amount invoiced by Parent, any of its Affiliates (including the Surviving Corporation) or
any of its Licensees (each, a “Selling Party”) to a third party for sales or distribution of XERAVA in the U.S., less the following deductions as calculated in accordance with GAAP consistently applied: 

(i)    customary trade, cash and quantity discounts given to customers; 

(ii)    rebates, credits and allowances given by reason of rejections returns, damaged or defective product or recalls;

 (iii)    government-mandated rebates, credits and adjustments paid or deducted; 

(iv)    customary price adjustments, allowances, credits, chargeback payments, discounts, rebates, free of charge
concessions, fees and reimbursements granted or made to managed care organizations, group purchasing organizations or other buying groups, pharmacy benefit management companies, health maintenance organizations and any other providers of health
insurance coverage, health care organizations or other health care institutions (including hospitals), health care administrators, patient assistance or other similar programs, or to federal state/provincial, local and other governments, including
their agencies; 
 (v)    reasonable and customary freight, shipping, insurance and other transportation expenses, if
borne by the applicable Selling Party without reimbursement from any third party; 
 (vi)    amounts written off as
uncollectable debt; provided that the amount of any uncollectable debt deducted pursuant to this exception and actually collected in a subsequent Calendar Quarter shall be included in Net Sales for such subsequent Calendar Quarter; and 

(vii)    sales, value-added, excise taxes, tariffs and duties, and other taxes and government charges directly related to
the sale, delivery or use of XERAVA (but not including taxes assessed against the net income derived from such sale). 
 Furthermore, Net
Sales shall not include use of or sale at or below the direct manufacturing cost of XERAVA by Parent, its Affiliates (including the Surviving Corporation) and/or its sublicensees of XERAVA for non-clinical or
clinical studies, patient-assistance programs or charitable donations. 
 Resales or sales of XERAVA made in good faith between or among any
Selling Party shall not be included in the calculation of Net Sales but the subsequent resale or sale to a non-Affiliate third party (other than a Selling Party) shall be included in the computation of Net
Sales. 
 All Net Sales shall be computed in Dollars, and where any Net Sales are calculated in a currency other than Dollars, they shall be
translated into Dollars in accordance with GAAP. 

  
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 “Officer’s Certificate” means a certificate signed by the chief
executive officer, president, chief financial officer, any vice president, the controller, the treasurer or the secretary, in each case of Parent, in his or her capacity as such an officer, and delivered to the Rights Agent. 

“Permitted Transfer” means a transfer of CVRs (a) upon death of a Holder by will or intestacy; (b) by instrument to
an inter vivos or testamentary trust in which the CVRs are to be passed to beneficiaries upon the death of the trustee; (c) pursuant to a court order; (d) by operation of law (including by consolidation or merger) or without
consideration in connection with the dissolution, liquidation or termination of any corporation, limited liability company, partnership or other entity; (e) in the case of CVRs held in book-entry or other similar nominee form, from a nominee to
a beneficial owner and, if applicable, through an intermediary, as allowable by DTC; or (f) as provided in Section 2.10. 

“Rights Agent” means the Rights Agent named in the first paragraph of this Agreement, until a successor Rights Agent becomes
such pursuant to the applicable provisions of this Agreement, and thereafter “Rights Agent” shall mean such successor Rights Agent. 

“Share” means each share of Company Common Stock outstanding immediately prior to the Effective Time, except any
(i) shares of Company Common Stock held by the Company or any wholly-owned Subsidiary of the Company as of immediately prior to the Effective Time (or held in the Company’s treasury), (ii) shares of Company Common Stock held by Parent,
Merger Sub or any other wholly-owned Subsidiary of Parent as of immediately prior to the Effective Time or (iii) Dissenting Company Shares. 

“U.S.” means the United States of America and its territories, districts and possessions. 

1.2    Rules of Construction. For purposes of this Agreement, the parties hereto agree that: (a) whenever the
context requires, the singular number shall include the plural, and vice versa; (b) the masculine gender shall include the feminine and neuter genders; the feminine gender shall include the masculine and neuter genders; and the neuter gender
shall include masculine and feminine genders; (c) the word “extent” in the phrase “to the extent” means the degree to which a subject or other thing extends, and does not simply mean “if”; (d) the words
“include” and “including,” and variations thereof, shall not be deemed to be terms of limitation, but rather shall be deemed to be followed by the words “without limitation;” (e) the meaning assigned to each capitalized
term defined and used in this Agreement is equally applicable to both the singular and the plural forms of such term, and words denoting any gender include all genders; (f) where a word or phrase is defined in this Agreement, each of its other
grammatical forms has a corresponding meaning unless the context otherwise requires; (g) a reference to any specific Legal Requirement or to any provision of any Legal Requirement includes any amendment to, and any modification, re-enactment or successor thereof, any legislative provision substituted therefor and all rules, regulations and statutory instruments issued thereunder or pursuant thereto; (h) references to any agreement or
Contract are to that agreement or Contract as amended, modified or supplemented; (i) they have been represented by legal counsel during the negotiation and execution and delivery of this Agreement and therefore waive the application of any
Legal Requirement, holding or rule of construction providing that ambiguities in an agreement or other document will be construed against the party drafting such agreement or 

  
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document; and (j) the word “or” shall not be exclusive (i.e., “or” shall be deemed to mean “and/or”) unless the subjects of the conjunction are mutually
exclusive. The headings contained in this Agreement are for convenience of reference only, shall not be deemed to be a part of this Agreement and shall not be referred to in connection with the construction or interpretation of this Agreement. All
references to “Dollars” or “$” are to United States Dollars, unless expressly stated otherwise. 

2.    CONTINGENT VALUE RIGHTS 

2.1    CVRs. 

(a)    As provided in the Merger Agreement: 

(i)    effective as of the Acceptance Time, Merger Sub will accept for payment and pay the Consideration,
including one CVR, for each share of Company Common Stock validly tendered and not validly withdrawn pursuant to the Offer; and 

(ii)    effective as of the Effective Time, (A) each Share shall be converted into the right to
receive the Consideration, which includes one CVR, and (B) each Company Warrant that is assumed and converted pursuant to Section 5.2(c) of the Merger Agreement shall be treated in accordance with its terms. 

(b)    The initial Holders shall be determined pursuant to the terms of the Merger Agreement and this Agreement, and a
list of the initial Holders shall be furnished to the Rights Agent by or on behalf of Parent in accordance with Section 4.1 hereof. 

2.2    Non-transferable. The CVRs may not be sold, assigned, transferred,
pledged, encumbered or in any other manner transferred or disposed of, in whole or in part, other than through a Permitted Transfer, and, in the case of a Permitted Transfer, only in accordance with Section 2.3(c) hereof and in compliance with
applicable United States federal and state securities laws and the terms and conditions hereto. Any such sale, assignment, transfer, pledge, encumbrance or disposal of CVRs, in whole or in part, in violation of this Section 2.2, shall be null
and void and of no effect. 
 2.3    No Certificate; Registration; Registration of Transfer; Change of Address.

 (a)    The CVRs shall not be evidenced by a certificate or other instrument. 

(b)    The Rights Agent shall keep a register (the “CVR Register”) for the purpose of identifying the
Holders and registering CVRs and transfers of CVRs as herein provided. The CVR Register will initially show one position for Cede & Co. representing all of the CVRs that are issued to the holders of Shares held by DTC on behalf of the
street holders of the Shares. The Rights Agent will have no responsibility whatsoever directly to the street name holders or DTC participants with respect to transfers of CVRs. With respect to any payments to be made under Section 2.4 below,
the Rights Agent will accomplish such payment to any former street name holders of the Shares by sending such payments to DTC. The Rights Agent will have no responsibilities whatsoever with regard to the distribution of payments by DTC to such
street name holders. 

  
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 (c)    Subject to the restrictions on transferability set forth in
Section 2.2, every request made to transfer a CVR must be in writing and accompanied by a written instrument of transfer in form reasonably satisfactory to the Rights Agent pursuant to its written guidelines, duly executed by the Holder
thereof, the Holder’s attorney duly authorized in writing, the Holder’s personal representative or the Holder’s survivor, as applicable, and setting forth in reasonable detail the circumstances relating to the transfer. Upon receipt
of such written notice, the Rights Agent shall, subject to its reasonable determination that the transfer instrument is in proper form and the transfer otherwise complies with the other terms and conditions of this Agreement (including the
provisions of Section 2.2), register the transfer of the CVRs in the CVR Register and notify the Parent of the same. Any registration, transfer or assignment of the CVRs shall be without charge to the Holder (other than payment of a sum to the
extent necessary to cover any stamp or other Tax or other governmental charge that is imposed in connection with any such registration, transfer or assignment). All duly transferred CVRs registered in the CVR Register shall be the valid obligations
of Parent and shall entitle the transferee to the same benefits and rights under this Agreement as those held immediately prior to the transfer by the transferor. No transfer of a CVR shall be valid unless and until registered in the CVR Register.

 (d)    A Holder may make a written request to the Rights Agent to change such Holder’s address of record in the
CVR Register. The written request must be duly executed by the Holder. Upon receipt of such written request, the Rights Agent is hereby authorized to, and shall promptly, record the change of address in the CVR Register. 

2.4    Payment Procedures. 

(a)    If any Milestone is achieved, then, in each case, on a date (a “Milestone Payment Date”) that is
within 60 days following the last day of such Calendar Quarter in which such Milestone is achieved: 

(i)    Parent will deliver to the Rights Agent (A) a notice (a “Milestone Notice”)
indicating the achievement of such Milestone and that the Holders are entitled to receive the applicable Milestone Amount, and (B) for each CVR, cash in the aggregate amount of the Milestone Amount. 

(ii)    Subject to the terms of this Agreement, each CVR shall entitle the Holder thereof to receive from
the Rights Agent (on behalf of Parent), for each CVR, the Milestone Amount, in each case subject to any applicable withholding Tax. 

(b)    The Rights Agent shall promptly, and in any event within 10 Business Days of receipt of a Milestone Notice, as
well as any letter of instruction reasonably required by the Rights Agent, send each Holder at its registered address a copy of such Milestone Notice. At the time the Rights Agent sends a copy of such Milestone Notice to the Holders, the Rights
Agent shall also pay to each Holder, subject to any applicable withholding Tax, the applicable Milestone Amount (the amount of which each Holder is entitled to receive shall be based on the applicable Milestone Amount multiplied by the number of
CVRs held by such 

  
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Holder as reflected in the CVR Register), in accordance with the corresponding letter of instruction (i) by check mailed to the address of such Holder reflected in the CVR Register as of
5:00 p.m. New York City time on the date of the applicable Milestone Notice or (ii) with respect to any such Holder that is due an amount in excess of $100,000 in the aggregate who has provided the Rights Agent wiring instructions in writing as
of the close of business on the date of the Milestone Notice, by wire transfer of immediately available funds to the account specified on such instruction. 

(c)    Notwithstanding any other provisions of this Agreement, any portion of the amounts payable pursuant to
Section 2.4(b) that remains unclaimed as of the first anniversary of the applicable Milestone Payment Date (including by means of uncashed checks or invalid addresses on the CVR Register) shall be delivered to Parent or its designee and not
disbursed to the Holders, and, thereafter, such Holders shall be entitled to look to Parent (subject to abandoned property, escheat and other similar Laws) only as general creditors thereof with respect to such cash that may be payable. 

(d)    Neither Parent, the Rights Agent nor any of their Affiliates shall be liable to any Holder for any payments
delivered to a public official pursuant to any abandoned property, escheat law or other similar Legal Requirements. 

(e)    If a Milestone is not achieved during any one of the 2021, 2022, 2023 or 2024 Calendar Years, then on or before
the date that is 60 days after the expiration of each such applicable Calendar Year period, Parent shall deliver to the Rights Agent a certificate certifying that such Milestone has not occurred, accompanied by a statement setting forth, in
reasonable detail, a calculation of Net Sales for the applicable period (each, a “Milestone Non-Achievement Certificate”). The Rights Agent shall promptly, and in any event within 10 Business
Days of receipt of a Milestone Non-Achievement Certificate, send each Holder at its registered address a copy of such Milestone Non-Achievement Certificate, including
detail regarding the ability of a Holder or Holders to dispute or contest such determination of non-achievement of a Milestone pursuant to this Agreement. If the Rights Agent does not receive from the Acting
Holders a written objection to (i) a Milestone Non-Achievement Certificate with respect to Milestone 1, if any, within 180 days of the delivery by the Rights Agent of such Milestone Non-Achievement Certificate to the Holders in accordance with this Section 2.4(e), the Holders shall be deemed to have accepted such Milestone Non-Achievement Certificate
and Parent and its Affiliates shall have no further obligation with respect to Milestone 1 and the Milestone 1 Amount, and/or (ii) a Milestone Non-Achievement Certificate with respect to Milestone 2
Milestone 3, and/or Milestone 4, if any, within 180 days of the delivery by the Rights Agent of such Milestone Non-Achievement Certificate with respect the 2024 Calendar Year to the Holders in accordance with
this Section 2.4(e), the Holders shall be deemed to have accepted such Milestone Non-Achievement Certificate and Parent and its Affiliates shall have no further obligation with respect to each such
Milestone and the applicable Milestone Amount. 
 (f)    Notwithstanding anything herein to the contrary, in no event
shall the aggregate payments to Holders under this Section 2 exceed the Milestone Cap. 

2.5    Withholding. Each of Parent, the Rights Agent, the Exchange Agent, the Surviving Corporation, their
respective Affiliates, and any other Person who has any obligation 

  
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to deduct or withhold from any consideration payable pursuant to this Agreement shall be entitled to deduct and withhold from the amounts otherwise payable pursuant to this Agreement such amounts
as are required by any law to be deducted and withheld, as may be reasonably determined by such Person. To the extent that amounts are so withheld and remitted to the appropriate Governmental Body in accordance with applicable Legal Requirements,
such withheld amounts shall be treated for all purposes of this Agreement as having been paid to the Person in respect of which such deduction and withholding was made. 

2.6    Adjustment of CVRs. 

(a)    In case of any Change of Control, appropriate adjustment shall be made in the application of the provisions herein
set forth with respect to the rights and interests of Holders so that the provisions set forth herein shall thereafter be applicable, as nearly as possible, in relation to any cash thereafter deliverable upon payment of CVRs. 

(b)    Whenever an adjustment is made to the terms of the CVRs pursuant to this Section 2.6, Parent will deliver to
the Rights Agent a notice of such Change of Control within 3 Business Days of the closing of such Change of Control, setting forth in reasonable detail the terms of such Change of Control and any adjustments made pursuant to this Section 2.6.
The Rights Agent shall promptly, and in any event within 10 Business Days of receipt of such a notice, send each Holder a copy of such notice in accordance with Section 7.2. 

(c)    The Rights Agent has no duty to determine when an adjustment under this Section 2.6 should be made, how it
should be made or what it should be. The Rights Agent shall not be responsible for the Parent’s failure to comply with this Section 2.6. 

2.7    Notices to CVR Holders. Upon any adjustment pursuant to Section 2.6, Parent shall give prompt written
notice of such adjustment to the Rights Agent and shall cause the Rights Agent, on behalf of and at the expense of Parent, within 10 days after notification is received by the Rights Agent of such adjustment, to mail by first class mail, postage
prepaid, to each Holder a notice of such adjustment(s) and shall deliver to the Rights Agent a certificate of the Chief Financial Officer of Parent, setting forth in reasonable detail (i) the terms of such adjustment(s), (ii) a brief statement
of the facts requiring such adjustment(s) and (iii) the computation by which such adjustment(s) was made. Where appropriate, such notice by Parent may be given in advance and included as a part of the notice to the Holders required under the
other provisions of this Section 2.7. 
 2.8    Holding of Funds. All funds received by the Rights Agent
under this Agreement that are to be distributed or applied by the Rights Agent in the performance of services hereunder (the “Funds”) shall be held by the Rights Agent as agent for Parent and deposited in one or more bank accounts
to be maintained by the Rights Agent in its name as agent for Parent. Until paid pursuant to the terms of this Agreement, the Rights Agent will hold the Funds through such accounts in: deposit accounts of commercial banks with Tier 1 capital
exceeding $1 billion or with an average rating above investment grade by S&P (LT Local Issuer Credit Rating), Moody’s (Long Term Rating) and Fitch Ratings, Inc. (LT Issuer Default Rating) (each as reported by Bloomberg Finance L.P.).
The Rights Agent shall have no responsibility or liability for any diminution of the Funds that may result from any deposit made by the Rights 

  
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Agent in accordance with this paragraph, including any losses resulting from a default by any bank, financial institution or other third party; provided that in the event the Funds are
diminished below the level required for the Rights Agent to make cash payments as required under this Agreement, including any such diminishment as a result of investment losses, Parent shall promptly pay additional cash to the Rights Agent in an
amount equal to the deficiency in the amount required to make such payments. The Rights Agent may from time to time receive interest, dividends or other earnings in connection with such deposits. The Rights Agent shall not be obligated to pay such
interest, dividends or earnings to the Parent, any Holder or any other Person, unless there is a diminution of the Funds due to a deposit or investment made by the Rights Agent, in which case, the Rights Agent agrees that such interest, dividends or
earnings shall accrue to the benefit of Parent to the extent of such diminution of the Funds. 
 2.9    No Voting,
Dividends or Interest; No Equity or Ownership Interest. 
 (a)    Nothing contained in this Agreement shall be
construed as conferring upon any Holder, by virtue of being a Holder of a CVR, the right to receive dividends or the right to vote or to consent or to receive notice as stockholders in respect of the meetings of stockholders or the election of
directors of Parent or any constituent company to the Merger or any of their respective Subsidiaries or Affiliates or any other matter, or any other rights of any kind or nature whatsoever as a stockholder of Parent or in any constituent company to
the Merger or any of their respective Subsidiaries or Affiliates, either at law or in equity. 
 (b)    The CVRs shall
not represent any equity or ownership interest in Parent or in any constituent company to the Merger or any of their respective Subsidiaries or Affiliates. The rights of a Holder in respect of the CVRs are limited to those expressed in this
Agreement and the Merger Agreement. 
 2.10    Ability to Abandon CVR. A Holder may at any time, at such
Holder’s option, abandon all of such Holder’s remaining rights in a CVR by transferring such CVR to Parent or any of its Affiliates without consideration therefor. Nothing in this Agreement shall prohibit Parent or any of its Affiliates
from offering to acquire or acquiring any CVRs for consideration from the Holders, in private transactions or otherwise, in its sole discretion. Any CVRs acquired by Parent or any of its Affiliates shall be automatically deemed extinguished and no
longer outstanding for purposes of the definition of Acting Holders and Section 5 and Section 6. 

3.    THE RIGHTS AGENT 

3.1    Certain Duties and Responsibilities. Parent hereby appoints the Rights Agent to act as rights agent for
Parent in accordance with the express terms and conditions set forth in this Agreement (and no implied terms and conditions), and the Rights Agent hereby accepts such appointment. The Rights Agent shall not have any liability for any actions taken,
suffered or omitted to be taken in connection with this Agreement, except to the extent of its gross negligence, bad faith or willful or intentional misconduct. 

3.2    Certain Rights of the Rights Agent. The Rights Agent undertakes to perform such duties and only such duties
as are specifically set forth in this Agreement, and no 

  
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implied covenants or obligations shall be read into this Agreement against the Rights Agent. In addition: 

(a)    the Rights Agent may rely and shall be protected and held harmless by Parent in acting or refraining from acting
upon any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order or other paper or document believed by it in good faith to be genuine and to have been signed or presented by the proper party or
parties; 
 (b)    whenever the Rights Agent shall deem it desirable that a matter be proved or established prior to
taking, suffering or omitting any action hereunder, the Rights Agent may rely upon an Officer’s Certificate, which certificate shall be full authorization and protection to the Rights Agent, and the Rights Agent shall, in the absence of gross
negligence, bad faith or willful or intentional misconduct on its part, incur no liability and be held harmless by Parent for or in respect of any action taken, suffered or omitted to be taken by it under the provisions of this Agreement in reliance
upon such certificate; 
 (c)    the Rights Agent may engage and consult with counsel of its selection and the written
advice of such counsel or any opinion of counsel shall be full and complete authorization and protection and shall be held harmless by Parent in respect of any action taken, suffered or omitted by it hereunder in good faith and in reliance thereon;

 (d)    the permissive rights of the Rights Agent to do things enumerated in this Agreement shall not be construed as
a duty; 
 (e)    the Rights Agent shall not be required to give any note or surety in respect of the execution of such
powers or otherwise in respect of the premises; 
 (f)    the Rights Agent shall not be liable for or by reason of, and
shall be held harmless by Parent with respect to any of the statements of fact or recitals contained in this Agreement or be required to verify the same, but all such statements and recitals are and shall be deemed to have been made by Parent only;

 (g)    the Rights Agent shall have no liability and shall be held harmless by Parent in respect of the validity of
this Agreement or the execution and delivery hereof (except the due execution and delivery hereof by the Rights Agent and the enforceability of this Agreement against the Rights Agent assuming the due execution and delivery hereof by Parent); nor
shall it be responsible for any breach by Parent of any covenant or condition contained in this Agreement; 

(h)    Parent agrees to indemnify the Rights Agent for, and hold the Rights Agent harmless against, any loss, liability,
damage, judgement, fine, penalty, claim, demands, suits or expense arising out of or in connection with Rights Agent’s duties under this Agreement, including the reasonable
out-of-pocket costs and expenses of counsel in defending Rights Agent against any loss, liability, damage, judgement, fine, penalty, claim, demands, suits or expense,
unless such loss has been determined by a court of competent jurisdiction to be a result of Rights Agent’s gross negligence, bad faith or willful or intentional misconduct; 

  
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 (i)    Anything to the contrary notwithstanding, in the absence of
fraud or willful or intentional misconduct on the part of the Rights Agent, (i) the Rights Agent shall not be liable for any special, punitive, indirect, consequential or incidental loss or damage of any kind whatsoever (including but not
limited to lost profits) arising out of any act or failure to act hereunder, even if the Rights Agent has been advised of the likelihood of such loss or damage or has foreseen the possibility or likelihood of such damages and (ii) the aggregate
liability of the Rights Agent arising in connection with this Agreement, whether in contract, or in tort, or otherwise, is limited to, and shall not exceed, the amounts paid or payable hereunder by Parent to the Rights Agent as fees and charges;

 (j)    Parent agrees (i) to pay the fees and expenses of the Rights Agent in connection with this Agreement
agreed upon in writing by the Rights Agent and Parent prior to the date hereof, and (ii) to reimburse the Rights Agent for all taxes and governmental charges, reasonable
out-of-pocket expenses and other charges of any kind and nature incurred by the Rights Agent in the execution of this Agreement (other than Taxes imposed on or measured
by the Rights Agent’s net income and franchise or similar Taxes imposed on it (in lieu of net income Taxes)); and 

(k)    No provision of this Agreement shall require the Rights Agent to expend or risk its own funds or otherwise incur
any financial liability in the performance of any of its duties hereunder or in the exercise of its rights if there shall be reasonable grounds for believing that repayment of such funds or adequate indemnification against such risk or liability is
not reasonably assured to it. 
 3.3    Resignation and Removal; Appointment of Successor. 

(a)    The Rights Agent may resign at any time by giving written notice thereof to Parent specifying a date when such
resignation shall take effect, which notice shall be sent at least 60 days prior to the date so specified but in no event shall such resignation become effective until a successor Rights Agent has been appointed and accepted such appointment in
accordance with Section 3.3(e). Parent has the right to remove the Rights Agent at any time by specifying a date when such removal shall take effect but no such removal shall become effective until a successor Rights Agent has been appointed
and accepted such appointment in accordance with Section 3.3(e). Notice of such removal shall be given by Parent to the Rights Agent, which notice shall be sent at least 60 days prior to the date so specified. 

(b)    If the Rights Agent provides notice of its intent to resign, is removed or becomes incapable of acting, Parent
shall, as soon as is reasonably practicable, appoint a qualified successor Rights Agent who shall be a stock transfer agent of national reputation or the corporate trust department of a commercial bank. Notwithstanding the foregoing, if Parent shall
fail to make such appointment within a period of sixty (60) days after giving notice of such removal or after it has been notified in writing of such resignation or incapacity by the resigning or incapacitated Rights Agent, then the incumbent
Rights Agent may apply to any court of competent jurisdiction for the appointment of a new Rights Agent. The successor Rights Agent so appointed shall, forthwith upon its acceptance of such appointment in accordance with Section 3.3(e), become
the successor Rights Agent. 

  
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 (c)    Parent shall give notice of each resignation and each removal of
a Rights Agent and each appointment of a successor Rights Agent through the facilities of DTC in accordance with DTC’s procedures and/or by mailing written notice of such event by first-class mail to the Holders as their names and addresses
appear in the CVR Register. Each notice shall include the name and address of the successor Rights Agent. If Parent fails to send such notice within 10 Business Days after acceptance of appointment by a successor Rights Agent, the successor Rights
Agent shall cause the notice to be transmitted at the expense of Parent. Failure to give any notice provided for in this Section 3.3, however, shall not affect the legality or validity of the resignation or removal of the Rights Agent or the
appointment of the successor Rights Agent, as the case may be. 
 (d)    Notwithstanding anything else in this
Section 3.3, unless consented to in writing by the Acting Holders, Parent shall not appoint as a successor Rights Agent any Person that is not a stock transfer agent of national reputation or the corporate trust department of an international
commercial bank. 
 (e)    Acceptance of Appointment by Successor. Every successor Rights Agent appointed
hereunder shall, at or prior to such appointment, execute, acknowledge and deliver to Parent and to the retiring Rights Agent an instrument accepting such appointment and a counterpart of this Agreement, and thereupon such successor Rights Agent,
without any further act, deed or conveyance, shall become vested with all the rights, powers, trusts and duties of the retiring Rights Agent. On request of Parent or the successor Rights Agent, the retiring Rights Agent shall execute and deliver an
instrument transferring to the successor Rights Agent all the rights, powers, trusts and duties of the retiring Rights Agent. 

4.    COVENANTS 

4.1    List of Holders. Parent shall furnish or cause to be furnished to the Rights Agent the names and addresses
of the Holders within 10 days of the Effective Time. 
 4.2    Books and Records. Parent shall, and shall cause
its subsidiaries to, keep true, complete and accurate records in sufficient detail to enable the Holders and their consultants or professional advisors to determine the amounts payable hereunder. 

4.3    Payment of Milestone Amounts. Parent shall duly and promptly deposit with the Rights Agent for payment to
the Holders the Milestone Amounts in the manner provided for in Section 2.4 and in accordance with the terms of this Agreement. 

4.4    Further Assurances. Parent agrees that it will perform, execute, acknowledge and deliver or cause to be
performed, executed, acknowledged and delivered, all such further and other acts, instruments and assurances as may reasonably be required by the Rights Agent for the carrying out or performing by the Rights Agent of the provisions of this
Agreement. 
 4.5    Audit Rights. 

(a)    Until December 31, 2025, upon reasonable advance written notice from the Acting Holders, Parent shall permit
an independent certified public accounting firm of 

  
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nationally recognized standing selected by such Acting Holders and reasonably acceptable to Parent (the “Independent Accountant”) to have access at reasonable times during normal
business hours to the books and records of Parent and its Affiliates as may be reasonably necessary to evaluate and verify Parent’s calculation of Net Sales hereunder; provided that (x) such Acting Holders (and the Independent Accountant)
enter into customary confidentiality agreements reasonably satisfactory to Parent with respect to the confidential information of Parent or its Affiliates to be furnished pursuant to this Section 4.5 and (y) such access does not
unreasonably interfere with the conduct of the business of Parent or any of its Affiliates. The fees charged by such accounting firm shall be borne by Parent. The Independent Accountant shall provide Parent with a copy of all disclosures made to the
Acting Holders. The decision of such accounting firm shall be final, conclusive and binding on Parent and the Holders, shall be nonappealable and shall not be subject to further review, absent manifest error. Parent shall not enter into any
transaction constituting a Change of Control unless such agreement contains provisions that would permit such accounting firm with such access to the records of the other party in such Change of Control if and to the extent as are reasonably
necessary to ensure compliance with this Section 4.5. The audit rights set forth in this Section 4.5(a) may not be exercised by the Acting Holders more than once in any given twelve (12) month period. 

(b)    If, in accordance with the procedures set forth in Section 4.5(a), the Independent Accountant concludes that
any Milestone Amount should have been paid but was not paid when due, Parent shall promptly, and in any event within thirty (30) days of the date the Independent Accountant delivers to Parent the Independent Accountant’s written report,
pay each Holder such Milestone Amount (to the extent not paid on a subsequent date), plus interest at the thirty (30) day U.S. dollar “prime rate” effective for the date such payment was due, as reported by Bloomberg, from when such
Milestone Amount should have been paid, as applicable, to the date of actual payment, pursuant to Section 2.4(a)(i) and Section 2.4(b), as applicable. 

4.6    Commercially Reasonable Efforts. Commencing upon the Closing and continuing until the earlier of
December 31, 2024 or the achievement of all Milestones, Parent shall, and shall cause its controlled Affiliates and Licensees to, use Commercially Reasonable Efforts to achieve the Milestones. Without limiting the foregoing, neither Parent nor
any of its controlled Affiliates shall act in bad faith for the purpose of avoiding achievement of any Milestone or the payment of any Milestone Amount. 

5.    AMENDMENTS 

5.1    Amendments without Consent of Holders. 

(a)    Without the consent of any Holders, Parent, at any time and from time to time, may enter into one or more
amendments hereto, for any of the following purposes: 
 (i)    to evidence the succession of another
person to Parent and the assumption by any such successor of the covenants of Parent herein; provided that such succession and assumption is in accordance with the terms of this Agreement; 

  
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 (ii)    to evidence the succession of another Person as
a successor Rights Agent and the assumption by any such successor of the covenants and obligations of the Rights Agent herein; provided that such succession and assumption is in accordance with the terms of this Agreement; 

(iii)    to add to the covenants of Parent such further covenants, restrictions, conditions or provisions
as Parent shall consider to be for the protection of the Holders; provided that, in each case, such provisions do not adversely affect the interests of the Holders; 

(iv)    to cure any ambiguity, to correct or supplement any provision herein that may be defective or
inconsistent with any other provision herein or in the Merger Agreement, or to make any other provisions with respect to matters or questions arising under this Agreement; provided that, in each case, such provisions do not adversely affect the
interests of the Holders; 
 (v)    as may be necessary or appropriate to ensure that the CVRs are not
subject to registration under the Securities Act, the Exchange Act or any applicable state securities or “blue sky” laws; provided that, such provisions shall not adversely affect the interests of the Holders; 

(vi)    to evidence the assignment of this Agreement by Parent as provided in Section 7.3; or 

(vii)    as may be necessary or appropriate to ensure that the Company complies with applicable law. 

In addition to the foregoing, upon the request of Parent, the Rights Agent hereby agrees to enter into one or more amendments hereto to evidence the
succession of another person as a successor Rights Agent in accordance with the terms of this Agreement and the assumption by any successor of the covenants and obligations of such Rights Agent herein, without modification of such covenants or
obligations other than as permitted by this Section 5.1. 
 (b)    Without the consent of any Holders, Parent and
the Rights Agent, at any time and from time to time, may enter into one or more amendments hereto to reduce the number of CVRs, in the event any Holder agrees to renounce such Holder’s rights under this Agreement in accordance with
Section 7.4 or to transfer CVRs to Parent pursuant to Section 2.10. 
 (c)    Promptly after the execution by
Parent and the Rights Agent of any amendment pursuant to the provisions of this Section 5.1, Parent shall mail (or cause the Rights Agent to mail) a notice thereof through the facilities of DTC in accordance with DTC’s procedures and/or by
first class mail to the Holders at their addresses as they appear on the CVR Register, setting forth such amendment. 

  
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 5.2    Amendments with Consent of Holders. 

(a)    Subject to Section 5.1 (which amendments pursuant to Section 5.1 may be made without the consent of any
Holder), with the written consent of the Holders of not less than a majority of the outstanding CVRs as set forth in the CVR Register, whether evidenced in writing or taken at a meeting of the Holders, Parent and the Rights Agent may enter into one
or more amendments hereto for the purpose of adding, eliminating or changing any provisions of this Agreement, even if such addition, elimination or change is materially adverse to the interest of the Holders. 

(b)    Promptly after the execution by Parent and the Rights Agent of any amendment pursuant to the provisions of this
Section 5.2, Parent shall mail (or cause the Rights Agent to mail) a notice thereof through the facilities of DTC in accordance with DTC’s procedures and/or by first class mail to the Holders at their addresses as they appear on the CVR
Register, setting forth such amendment. 
 5.3    Execution of Amendments. Prior to executing any amendment
permitted by this Section 5, the Rights Agent shall be entitled to receive, and shall be fully protected in relying upon, an opinion of counsel selected by Parent and reasonably acceptable to Rights Agent stating that the execution of such
amendment is authorized or permitted by this Agreement. 
 5.4    Effect of Amendments. Upon the execution of any
amendment under this Section 5, this Agreement shall be modified in accordance therewith, such amendment shall form a part of this Agreement for all purposes and every Holder shall be bound thereby. 

6.    REMEDIES OF THE HOLDERS 

6.1    Event of Default. 

(a)    “Event of Default” with respect to the CVRs, means each one of the following events which shall
have occurred and be continuing (whatever the reason for such Event of Default and whether it shall be voluntary or involuntary or be effected by operation of Legal Requirements, pursuant to any judgment, decree or order of any court or any order,
rule or regulation of any Governmental Body or otherwise): (i) default in the payment by Parent pursuant to the terms of this Agreement of all or any part of a Milestone Amount after a period of ten (10) Business Days after the Milestone Amount
shall become due and payable and (ii) material default in the performance, or breach in any material respect, of any other covenant or warranty of Parent hereunder, and continuance of such default or breach for a period of sixty (60) days
after a written notice specifying such default or breach and requiring it to be remedied is given, which written notice states that it is a “Notice of Default” hereunder and is sent by registered or certified mail to Parent and the
Rights Agent by the Acting Holders. 
 (b)    If an Event of Default described above occurs and is continuing (and has
not been cured or waived), then, and in each and every such case, the Acting Holders by notice in writing to Parent and the Rights Agent, may, in their discretion, commence a suit to protect the rights of the Holders, including to obtain payment for
any amounts then due and payable. 

  
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 6.2    Suits by Holders. Except for the rights of the Rights
Agent set forth herein, the Acting Holders will have the sole right, on behalf of all Holders, by virtue of or under any provision of this Agreement, to institute any action or proceeding with respect to this Agreement, and no individual Holder or
other group of Holders will be entitled to exercise such rights. Notwithstanding the foregoing, (a) the right of any Holder of any CVR to receive payment of the amounts that a Milestone Notice indicates are payable in respect of such CVR on or
after the applicable due date, or to institute any action or proceeding for the enforcement of any such payment on or after such due date, shall not be impaired or affected without the consent of such Holder and (b) in the event of an
insolvency proceeding of the Parent, individual Holders shall be entitled to assert claims in such insolvency proceeding and take related actions in pursuit of such claims with respect to any payment that may be claimed by or on behalf of the Parent
or by any creditor of the Parent. 
 7.    OTHER PROVISIONS OF GENERAL APPLICATION 

7.1    Notices to the Rights Agent and Parent. Any notice or other communication required or permitted to be
delivered to Parent or the Rights Agent under this Agreement shall be in writing and shall be deemed properly delivered, given and received (a) upon receipt when delivered by hand, (b) two Business Days after being sent by registered mail
or by courier or express delivery service, (c) if sent by email transmission prior to 6:00 p.m. recipient’s local time, upon transmission when receipt is confirmed or (d) if sent by email transmission after 6:00 p.m. recipient’s
local time and receipt is confirmed, the Business Day following the date of transmission; provided that in each case the notice or other communication is sent to the physical address or email address, as applicable, set forth beneath the name
of such party below (or to such other physical address or email address as such party shall have specified in a written notice given to the other party): 

If to the Rights Agent, to it at: 

[    ] 

[Address] 

Attention: [    ] 

Facsimile: [    ] 

Email: [    ] 

If to Parent, to it at: 

La Jolla Pharmaceutical Company 

4550 Towne Centre Court 

San Diego, California 92121 

Attention: Chairman 

E-mail: ktang@ljpc.com 

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

Gibson, Dunn & Crutcher LLP 

555 Mission Street 

  
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 San Francisco, California 94105 

Attention: Ryan A. Murr 

E-mail: RMurr@gibsondunn.com 

The Rights Agent or Parent may specify a different address, facsimile number or email address by giving notice in accordance with this Section 7.1. 

7.2    Notice to Holders. Where this Agreement provides for notice to Holders, such notice shall be sufficiently
given (unless otherwise herein expressly provided) if in writing and transmitted through the facilities of DTC in accordance with DTC’s procedures or mailed, first-class postage prepaid, to each Holder affected by such event, at the
Holder’s address as it appears in the CVR Register, not later than the latest date, and not earlier than the earliest date, if any, prescribed for the giving of such notice. In any case where notice to Holders is given by mail, neither the
failure to mail such notice, nor any defect in any notice so mailed, to any particular Holder shall affect the sufficiency of such notice with respect to other Holders. 

7.3    Successors and Assigns. Parent may assign, in its sole discretion and without the consent of any other
Person, any or all of its rights, interests and obligations hereunder to one or more direct or indirect wholly owned subsidiaries of Parent for so long as they remain wholly owned subsidiaries of Parent and any such subsidiary may assign any or all
of its rights, interests and obligations hereunder to one or more other direct or indirect wholly owned subsidiaries of Parent for so long as they remain wholly owned subsidiaries of Parent; provided that each such assignee agrees to assume
and be bound by all of the terms and conditions of this Agreement; provided, further, that Parent shall remain liable for the performance by each such assignee of all covenants, agreements and obligations of Parent hereunder. This
Agreement will be binding upon, inure to the benefit of and be enforceable by Parent’s successors and each assignee. Each of Parent’s successors and each assignee shall, by a supplemental contingent consideration payment agreement or other
acknowledgement executed and delivered to the Rights Agent, expressly agree to assume and be bound by all of the terms and conditions of this Agreement. This Agreement shall not restrict Parent’s or any successor’s ability to merge or
consolidate or enter into or consummate any Change of Control; provided, that in the event of a Change of Control, Parent or the Company, as applicable, shall cause the acquirer to assume Parent’s obligations, duties and covenants under
this Agreement. Except as otherwise permitted herein, Parent may not assign this Agreement without the prior written consent of the Acting Holders. Any attempted assignment of this Agreement or any such rights in violation of this Section 7.3
shall be void and of no effect. 
 7.4    No Third Party Beneficiaries. Nothing in this Agreement, express or
implied, shall give to any Person (other than the Rights Agent and its permitted successors and assigns, Parent, Parent’s permitted successors and assignees, and the Holders and the Holders’ successors and assigns pursuant to Permitted
Transfers, each of whom is intended to be, and is, a third party beneficiary hereunder) any benefit or any legal or equitable right, remedy or claim under this Agreement or under any covenant or provision herein contained, all such covenants and
provisions being for the sole benefit of the Rights Agent and its permitted successors and assigns, Parent, Parent’s permitted successors and assignees, and the Holders and the Holders’ successors and assigns pursuant to Permitted
Transfers. The rights hereunder of Holders and their successors and assigns pursuant to Permitted Transfers are limited to those expressly 

  
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provided in this Agreement. Notwithstanding anything to the contrary contained herein, any Holder or Holder’s successor or assign pursuant to a Permitted Transfer may at any time agree to
renounce, in whole or in part, whether or not for consideration, its rights under this Agreement by written notice to the Rights Agent and Parent, which notice, if given, shall be irrevocable, and Parent may, in its sole discretion, at any time
offer consideration to Holders in exchange for their agreement to irrevocably renounce their rights, in whole or in part, hereunder. 

7.5    Governing Law; Jurisdiction. This Agreement, the CVRs and all actions arising under or in connection
herewith and therewith (whether sounding in contract, tort or otherwise) shall be governed by and construed in accordance with the laws of the State of Delaware, without giving effect to any laws, rules or provisions that would cause the application
of the laws of any jurisdiction other than the State of Delaware. In any action between any of the parties arising out of or relating to this Agreement or the CVRs: (a) each of the parties irrevocably and unconditionally consents and submits to
the exclusive jurisdiction and venue of the Chancery Court of the State of Delaware; and (b) each of the parties irrevocably waives the right to trial by jury. All rights and remedies existing under this Agreement are cumulative to, and not
exclusive of, any rights or remedies otherwise available. 
 7.6    Severability. In the event that any provision
of this Agreement, or the application thereof, becomes or is declared by a court of competent jurisdiction to be illegal, void or unenforceable, the remainder of this Agreement shall continue in full force and effect and the application of such
provision to other Persons or circumstances shall be interpreted so as reasonably to effect the intent of the parties. The parties further agree to replace such void or unenforceable provision of this Agreement with a valid and enforceable provision
that will achieve, to the extent possible, the economic, business and other purposes of such void or unenforceable provision. 

7.7    Termination. This Agreement shall be terminated and of no force or effect, the parties hereto shall have no
liability hereunder (other than with respect to monies due and owing by Parent to Rights Agent), and no payments shall be required to be made, upon the earlier to occur of (a) the payment in full of the Milestone 1 Amount, the Milestone 2
Amount and the Milestone 3 Amount, by the mailing by the Rights Agent to the address of each Holder as reflected in the CVR Register the full amount of each Milestone Amount as required to be paid under the terms of this Agreement,
(b) December 31, 2024, if Milestone 2 and/or Milestone 3 has not been achieved on or prior to such date, and (c) the termination of the Merger Agreement in accordance with its terms. Notwithstanding the foregoing, no such termination
shall affect any rights or obligations accrued prior to the effective date of such termination or Sections 2.4(c), 2.4(d), 2.4(e), 2.4(f), 3.2, 4.5, 7.4, 7.5, 7.6, 7.8, 7.9, 7.10 or this Section 7.7, which shall survive the termination of this
Agreement, or the resignation, replacement or removal of the Rights Agent. 
 7.8    Entire Agreement;
Counterparts. As it relates to the Rights Agent, this Agreement constitutes the entire agreement of the parties hereto and supersedes all contemporaneous and prior agreements and understandings, both written and oral, among or between any of the
parties hereto, with respect to the subject matter hereof. As between the Parent and the Company this Agreement and the Merger Agreement constitute the entire agreement and supersede all contemporaneous and prior agreements and understandings, both


  
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written and oral, among or between any of the parties, with respect to the subject matter hereof. If and to the extent that any provision of this Agreement is inconsistent or conflicts with the
Merger Agreement, this Agreement shall govern and be controlling. This Agreement may be executed in counterparts, each of which shall be deemed an original and all of which shall constitute one and the same instrument. The exchange of a fully
executed Agreement (in counterparts or otherwise) by PDF shall be sufficient to bind the parties hereto to the terms and conditions of this Agreement. 

7.9    No Fiduciary Obligations. Each of Parent and the Rights Agent acknowledges and agrees that the other party,
its Affiliates and their respective officers, directors and controlling Persons do not owe any fiduciary duties to the first party or any of its respective Affiliates, officers, directors or controlling Persons. The only obligations of the Parent
and the Rights Agent to each other and their Affiliates and their respective officers, directors and controlling Persons arising out of this Agreement are the contractual obligations expressly set forth in this Agreement. 

7.10    Confidentiality. The Rights Agent and the Parent agree that all books, records, information and data
pertaining to the business of the other party, including inter alia, personal, non-public Holder information, which are exchanged or received pursuant to the negotiation or the carrying out of this Agreement
including the fees for services set forth in the attached schedule shall remain confidential, and shall not be voluntarily disclosed to any other person, except as may be required by a valid order of an arbitration panel, court or governmental body
of competent jurisdiction or is otherwise required by law or regulation, including SEC or Nasdaq rules and regulations, or pursuant to subpoenas from state or federal government authorities (e.g., in divorce and criminal actions). 

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 

  
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 IN WITNESS WHEREOF, each of the parties has caused this Agreement to be executed on its
behalf by its duly authorized officers as of the day and year first above written. 
  

			
	LA JOLLA PHARMACEUTICAL COMPANY


 
			
		
	By:	 	  



 
			
	Name:	 	
	Title:	 	
	
	[RIGHTS AGENT]


 
			
		
	By:	 	  



 
			
	Name:	 	  

	Title:	 	  




  
 [Signature Page to
Contingent Value Rights Agreement]