Document:

EXHIBIT
4.12

 

AMAG
PHARMACEUTICALS, INC.

 

and

 

[·], AS WARRANT AGENT

 

FORM OF
PREFERRED STOCK

WARRANT
AGREEMENT

 

DATED
AS OF [·]

 

 

AMAG
PHARMACEUTICALS, INC.

 

FORM OF
PREFERRED STOCK WARRANT AGREEMENT

 

PREFERRED STOCK WARRANT AGREEMENT (this “Agreement”),
dated as of
                    
between AMAG Pharmaceuticals, Inc. ,  a Delaware
corporation (the “Company”)
and 
                    
, a [corporation] [national banking association] organized and existing under
the laws of 
                and
having a corporate trust office in 
                
, as warrant agent (the “Warrant Agent”).

 

WHEREAS, the Company proposes to sell [if Warrants are sold with other
securities - [title of such other securities being offered] (the
“Other Securities”) with] warrant
certificates evidencing one or more warrants (the “Warrants” or, individually, a “Warrant”) representing the right to purchase [title of
Preferred Stock purchasable through exercise of Warrants] (the “Warrant Securities”), such warrant
certificates and other warrant certificates issued pursuant to this Agreement
being herein called the “Warrant Certificates,” and

 

WHEREAS, the Company desires the Warrant Agent to act on
behalf of the Company, and the Warrant Agent is willing so to act, in
connection with the issuance, registration, transfer, exchange, exercise and
replacement of the Warrant Certificates, and in this Agreement wishes to set
forth, among other things, the form and provisions of the Warrant Certificates
and the terms and conditions on which they may be issued, registered,
transferred, exchanged, exercised and replaced.

 

NOW THEREFORE, in consideration of the premises and of the mutual
agreements herein contained, the parties hereto agree as follows:

 

ARTICLE
1

 

ISSUANCE
OF WARRANTS AND EXECUTION AND DELIVERY OF WARRANT CERTIFICATES

 

1.1           Issuance
of Warrants. [If Warrants alone -
Upon issuance, each Warrant Certificate shall evidence one or more Warrants.] [ If Other Securities and Warrants —  Warrant Certificates shall be [initially]
issued in connection with the issuance of the Other Securities [but shall be
separately transferable on and after 
                           (the “Detachable
Date”)] [and shall not be separately transferable] and each Warrant
Certificate shall evidence one or more Warrants.] Each Warrant evidenced
thereby shall represent the right, subject to the provisions contained herein
and therein, to purchase one Warrant Security. [If Other Securities and Warrants -  Warrant Certificates shall be initially
issued in units with the Other Securities and each Warrant Certificate included
in such a unit shall evidence 
                           Warrants for each [$
                           principal amount] [
        
shares] of Other Securities included in such unit.]

 

1.2           Execution
And Delivery Of Warrant Certificates. Each Warrant Certificate, whenever issued, shall be
in registered form substantially in the form set forth in  Exhibit A  hereto, shall be dated the date of its
countersignature by the Warrant Agent and may have such letters, numbers, or
other marks of identification or designation and such legends or endorsements
printed, lithographed or engraved thereon as the officers of the Company
executing the same may approve (execution thereof to be conclusive evidence of
such approval) and as are not inconsistent with the provisions of this
Agreement, or as may be required to comply with any law or with any rule or
regulation made pursuant thereto or with any rule or regulation of any
securities exchange on which the Warrants may be listed, or to conform to
usage. The Warrant Certificates shall be signed on behalf of the Company by any
of its present or future chief executive officers, presidents, senior vice
presidents, vice presidents, chief financial officers, chief legal officers,
treasurers, assistant treasurers, controllers, assistant controllers,
secretaries or assistant secretaries under its corporate seal reproduced
thereon. Such signatures may be manual or facsimile signatures of such authorized
officers and may be imprinted or otherwise reproduced on the Warrant
Certificates. The seal of the Company may be in the form of a facsimile thereof
and may be impressed, affixed, imprinted or otherwise reproduced on the Warrant
Certificates.

 

No Warrant Certificate
shall be valid for any purpose, and no Warrant evidenced thereby shall be
exercisable, until such Warrant Certificate has been countersigned by the
manual signature of the Warrant Agent. Such signature by the Warrant Agent upon
any Warrant Certificate executed by the Company shall be conclusive evidence
that the Warrant Certificate so countersigned has been duly issued hereunder.

 

In case any officer of
the Company who shall have signed any of the Warrant Certificates either
manually or by facsimile signature shall cease to be such officer before the
Warrant Certificates so signed shall have been countersigned and delivered by
the Warrant Agent, such Warrant Certificates may be countersigned and delivered
notwithstanding that the person who signed Warrant Certificates ceased to be
such officer of the Company; and any Warrant Certificate may be signed on
behalf of the Company by such 

 

 

persons as, at the actual
date of the execution of such Warrant Certificate, shall be the proper officers
of the Company, although at the date of the execution of this Agreement any
such person was not such officer.

 

The term “holder” or “holder of a Warrant Certificate” as used herein shall mean any
person in whose name at the time any Warrant Certificate shall be registered
upon the books to be maintained by the Warrant Agent for that purpose [ If Other Securities and Warrants
are not immediately detachable— or upon the registration of the
Other Securities prior to the Detachable Date. Prior to the Detachable Date,
the Company will, or will cause the registrar of the Other Securities to, make
available at all times to the Warrant Agent such information as to holders of
the Other Securities as may be necessary to keep the Warrant Agent’s records up
to date].

 

1.3           Issuance
Of Warrant Certificates. Warrant Certificates evidencing the right to purchase Warrant
Securities may be executed by the Company and delivered to the Warrant Agent
upon the execution of this Warrant Agreement or from time to time thereafter.
The Warrant Agent shall, upon receipt of Warrant Certificates duly executed on
behalf of the Company, countersign such Warrant Certificates and shall deliver
such Warrant Certificates to or upon the order of the Company.

 

ARTICLE
2

 

WARRANT
PRICE, DURATION AND EXERCISE OF WARRANTS

 

2.1           Warrant
Price. During the
period specified in Section 2.2, each Warrant shall, subject to the terms
of this Warrant Agreement and the applicable Warrant Certificate, entitle the
holder thereof to purchase the number of Warrant Securities specified in the
applicable Warrant Certificate at an exercise price of $
           per Warrant Security, subject to adjustment
upon the occurrence of certain events, as hereinafter provided. Such purchase
price per Warrant Security is referred to in this Agreement as the “Warrant Price.”

 

2.2           Duration
Of Warrants. Each
Warrant Certificate may be exercised in whole or in part at any time, as
specified herein, on or after [the date thereof] [
                         
] and at or before [
              ]
 p.m., [
              ]  time, on 
                           or such later date as the Company may
designate by notice to the Warrant Agent and the holders of Warrant
Certificates mailed to their addresses as set forth in the record books of the
Warrant Agent (the “Expiration Date”).
Each Warrant not exercised at or before [
            ] p.m.,
[
              ]  time, on the Expiration Date shall become
void, and all rights of the holder of the Warrant Certificate evidencing such
Warrant under this Agreement shall cease.

 

2.3           Exercise
Of Warrants.

 

(a)       
    During the period specified in Section 2.2, the Warrants may be
exercised to purchase a whole number of Warrant Securities in registered form
by providing certain information as set forth on the reverse side of the
Warrant Certificate and by paying in full, in lawful money of the United States
of America, [in cash or by certified check or official bank check in New York
Clearing House funds] [by bank wire transfer in immediately available funds]
the Warrant Price for each Warrant Security with respect to which a Warrant is
being exercised to the Warrant Agent at its corporate trust office, provided
that such exercise is subject to receipt within five business days of such
payment by the Warrant Agent of the Warrant Certificate with the form of
election to purchase Warrant Securities set forth on the reverse side of the
Warrant Certificate properly completed and duly executed. The date on which
payment in full of the Warrant Price is received by the Warrant Agent shall,
subject to receipt of the Warrant Certificate as aforesaid, be deemed to be the
date on which the Warrant is exercised; provided, however, that if, at the date
of receipt of such Warrant Certificates and payment in full of the Warrant
Price, the transfer books for the Warrant Securities purchasable upon the
exercise of such Warrants shall be closed, no such receipt of such Warrant
Certificates and no such payment of such Warrant Price shall be effective to
constitute the person so designated to be named as the holder of record of such
Warrant Securities on such date, but shall be effective to constitute such
person as the holder of record of such Warrant Securities for all purposes at
the opening of business on the next succeeding day on which the transfer books
for the Warrant Securities purchasable upon the exercise of such Warrants shall
be opened, and the certificates for the Warrant Securities in respect of which
such Warrants are then exercised shall be issuable as of the date on such next
succeeding day on which the transfer books shall next be opened, and until such
date the Company shall be under no duty to deliver any certificate for such
Warrant Securities. The Warrant Agent shall deposit all funds received by it in
payment of the Warrant Price in an account of the Company maintained with it
and shall advise the Company by telephone at the end of each day on which a
payment for the exercise of Warrants is received of the amount so deposited to
its account. The Warrant Agent shall promptly confirm such telephone advice to
the Company in writing.

 

(b)      
     The Warrant Agent shall, from time to time, as
promptly as practicable, advise the Company of (i) the number of Warrant
Securities with respect to which Warrants were exercised, (ii) the
instructions of each holder of the Warrant Certificates evidencing such
Warrants with respect to delivery of the Warrant Securities to which such
holder is entitled upon such exercise, (iii) delivery of Warrant
Certificates evidencing the balance, if any, of the Warrants for the remaining
Warrant Securities after such exercise, and (iv) such other information as
the Company shall reasonably require.

 

(c)        
   As
soon as practicable after the exercise of any Warrant, the Company shall issue
to or upon the order of 

 

 

the holder of the Warrant
Certificate evidencing such Warrant the Warrant Securities to which such holder
is entitled, in fully registered form, registered in such name or names as may
be directed by such holder. If fewer than all of the Warrants evidenced by such
Warrant Certificate are exercised, the Company shall execute, and an authorized
officer of the Warrant Agent shall manually countersign and deliver, a new
Warrant Certificate evidencing Warrants for the number of Warrant Securities
remaining unexercised.

 

(d)          
 The Company
shall not be required to pay any stamp or other tax or other governmental
charge required to be paid in connection with any transfer involved in the
issue of the Warrant Securities, and in the event that any such transfer is
involved, the Company shall not be required to issue or deliver any Warrant
Security until such tax or other charge shall have been paid or it has been
established to the Company’s satisfaction that no such tax or other charge is
due.

 

(e)            Prior to the issuance of any Warrants
there shall have been reserved, and the Company shall at all times through the
Expiration Date keep reserved, out of its authorized but unissued Warrant
Securities, a number of shares sufficient to provide for the exercise of the
Warrants.

 

ARTICLE
3

 

OTHER
PROVISIONS RELATING TO RIGHTS OF HOLDERS OF WARRANT CERTIFICATES

 

3.1           No
Rights As Warrant Securityholder Conferred By Warrants or Warrant Certificates. No Warrant Certificate or Warrant
evidenced thereby shall entitle the holder thereof to any of the rights of a
holder of Warrant Securities, including, without limitation, the right to
receive the payment of dividends or distributions, if any, on the Warrant
Securities or to exercise any voting rights, except to the extent expressly set
forth in this Agreement or the applicable Warrant Certificate.

 

3.2           Lost,
Stolen, Mutilated or Destroyed Warrant Certificates. Upon receipt by the Warrant Agent of
evidence reasonably satisfactory to it and the Company of the ownership of and
the loss, theft, destruction or mutilation of any Warrant Certificate and/or
indemnity reasonably satisfactory to the Warrant Agent and the Company and, in
the case of mutilation, upon surrender of the mutilated Warrant Certificate to
the Warrant Agent for cancellation, then, in the absence of notice to the
Company or the Warrant Agent that such Warrant Certificate has been acquired by
a bona fide purchaser, the Company shall execute, and an authorized officer of
the Warrant Agent shall manually countersign and deliver, in exchange for or in
lieu of the lost, stolen, destroyed or mutilated Warrant Certificate, a new
Warrant Certificate of the same tenor and evidencing Warrants for a like number
of Warrant Securities. Upon the issuance of any new Warrant Certificate under
this Section 3.2, the Company may require the payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Warrant
Agent) in connection therewith. Every substitute Warrant Certificate executed
and delivered pursuant to this Section 3.2 in lieu of any lost, stolen or
destroyed Warrant Certificate shall represent an additional contractual
obligation of the Company, whether or not the lost, stolen or destroyed Warrant
Certificate shall be at any time enforceable by anyone, and shall be entitled
to the benefits of this Agreement equally and proportionately with any and all
other Warrant Certificates duly executed and delivered hereunder. The
provisions of this Section 3.2 are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement of
mutilated, lost, stolen or destroyed Warrant Certificates.

 

3.3           Holder
of Warrant Certificate May Enforce Rights. Notwithstanding any of the provisions of this
Agreement, any holder of a Warrant Certificate, without the consent of the Warrant
Agent, the holder of any Warrant Securities or the holder of any other Warrant
Certificate, may, in such holder’s own behalf and for such holder’s own
benefit, enforce, and may institute and maintain any suit, action or proceeding
against the Company suitable to enforce, or otherwise in respect of, such
holder’s right to exercise the Warrants evidenced by such holder’s Warrant
Certificate in the manner provided in such holder’s Warrant Certificate and in
this Agreement.

 

3.4           Adjustments.

 

(a)        
   In
case the Company shall at any time subdivide its outstanding shares of [title
of Preferred Stock purchasable through exercise of Warrants] into a greater
number of shares, the Warrant Price in effect immediately prior to such
subdivision shall be proportionately reduced and the number of Warrant
Securities purchasable under the Warrants shall be proportionately increased.
Conversely, in case the outstanding shares of [title of Preferred Stock
purchasable through exercise of Warrants] of the Company shall be combined into
a smaller number of shares, the Warrant Price in effect immediately prior to
such combination shall be proportionately increased and the number of Warrant
Securities purchasable under the Warrants shall be proportionately decreased.

 

(b)      
     If at any time or from time to time the holders of
[title of Preferred Stock purchasable through exercise of Warrants] (or any
shares of stock or other securities at the time receivable upon the exercise of
the Warrants) shall have received or become entitled to receive, without
payment therefore,

 

(i)       
     [title of Preferred Stock purchasable through exercise
of Warrants] or any shares of stock or other securities which are at any time
directly or indirectly convertible into or exchangeable for [title of Preferred
Stock purchasable 

 

 

through exercise of
Warrants], or any rights or options to subscribe for, purchase or otherwise
acquire any of the foregoing by way of dividend or other distribution;

 

(ii)           any cash paid or payable otherwise than
in accordance with the terms of [title of Preferred Stock purchasable through
exercise of Warrants] or otherwise than as a cash dividend paid or payable out
of the Company’s current or retained earnings;

 

(iii)          any evidence of the Company’s
indebtedness or rights to subscribe for or purchase the Company’s indebtedness;
or

 

(iv)           [title of Preferred Stock purchasable
through exercise of Warrants] or additional stock or other securities or
property (including cash) by way of spinoff, split-up, reclassification,
combination of shares or similar corporate rearrangement (other than shares of
[title of Preferred Stock purchasable through exercise of Warrants] issued as a
stock split or adjustments in respect of which shall be covered by the terms of
Section 3.4(a) above), then and in each such case, the holder of each
Warrant shall, upon the exercise of the Warrant, be entitled to receive, in
addition to the number of Warrant Securities receivable thereupon, and without
payment of any additional consideration therefore, the amount of stock and
other securities and property (including cash and indebtedness or rights to
subscribe for or purchase indebtedness) which such holder would hold on the
date of such exercise had he been the holder of record of such Warrant
Securities as of the date on which holders of [title of Preferred Stock
purchasable through exercise of Warrants] received or became entitled to
receive such shares or all other additional stock and other securities and
property.

 

(c)       
    In case of (i) any reclassification, capital reorganization, or
change in the [title of Preferred Stock purchasable through the exercise of the
Warrants] of the Company (other than as a result of a subdivision, combination
or stock dividend provided for in Section 3.4(a) or Section 3.4(b) above),
(ii) share exchange, merger or similar transaction of the Company with or
into another person or entity (other than a share exchange, merger or similar
transaction in which the Company is the acquiring or surviving corporation and
which does not result in any change in the [title of Preferred Stock
purchasable through the exercise of the Warrants] other than the issuance of
additional shares of [title of Preferred Stock purchasable through the exercise
of the Warrants]) or (iii) the sale, exchange, lease, transfer or other
disposition of all or substantially all of the properties and assets of the
Company as an entirety (in any such case, a “Reorganization
Event”), then, as a condition of such Reorganization Event, lawful
provisions shall be made, and duly executed documents evidencing the same from
the Company or its successor shall be delivered to the holders of the Warrants,
so that the holders of the Warrants shall have the right at any time prior to
the expiration of the Warrants to purchase, at a total price equal to that
payable upon the exercise of the Warrants, the kind and amount of shares of
stock and other securities and property receivable in connection with such
Reorganization Event by a holder of the same number of shares of [title of
Preferred Stock purchasable through the exercise of the Warrants] as were
purchasable by the holders of the Warrants immediately prior to such
Reorganization Event. In any such case appropriate provisions shall be made
with respect to the rights and interests of the holders of the Warrants so that
the provisions hereof shall thereafter be applicable with respect to any shares
of stock or other securities and property deliverable upon exercise the
Warrants, and appropriate adjustments shall be made to the Warrant Price
payable hereunder provided the aggregate purchase price shall remain the same.
In the case of any transaction described in clauses (ii) and (iii) above,
the Company shall thereupon be relieved of any further obligation hereunder or
under the Warrants, and the Company as the predecessor corporation may
thereupon or at any time thereafter be dissolved, wound up or liquidated. Such
successor or assuming entity thereupon may cause to be signed, and may issue
either in its own name or in the name of the Company, any or all of the
Warrants issuable hereunder which heretofore shall not have been signed by the
Company, and may execute and deliver securities in its own name, in fulfillment
of its obligations to deliver Warrant Securities upon exercise of the Warrants.
All the Warrants so issued shall in all respects have the same legal rank and
benefit under this Agreement as the Warrants theretofore or thereafter issued
in accordance with the terms of this Agreement as though all of such Warrants
had been issued at the date of the execution hereof. In any case of any such
Reorganization Event, such changes in phraseology and form (but not in
substance) may be made in the Warrants thereafter to be issued as may be
appropriate.  The Warrant Agent may receive a written opinion of
legal counsel as conclusive evidence that any such Reorganization Event
complies with the provisions of this Section 3.4.

 

(d)      
     The Company may, at its option, at any time until the
Expiration Date, reduce the then current Warrant Price to any amount deemed
appropriate by the Board of Directors of the Company for any period not
exceeding twenty consecutive days (as evidenced in a resolution adopted by such
Board of Directors), but only upon giving the notices required by Section 3.5
at least ten days prior to taking such action.

 

(e)     
      Except as herein otherwise expressly provided, no
adjustment in the Warrant Price shall be made by reason of the issuance of any
securities of the Company or for any other reason whatsoever.

 

(f)      
      No fractional Warrant Securities shall be issued upon
the exercise of Warrants. If more than one Warrant shall be exercised at one
time by the same holder, the number of full Warrant Securities which shall be
issuable upon such exercise shall be computed on the basis of the aggregate
number of Warrant Securities purchased pursuant to the Warrants so exercised.
Instead of any fractional Warrant Security which would otherwise be issuable
upon exercise of any Warrant, the Company shall pay a cash adjustment in
respect of such fraction in an amount equal to the same fraction of the last
reported sale price (or bid price if there 

 

 

were no sales) per
Warrant Security, in either case as reported on the principal registered
national securities exchange on which the Warrant Securities are listed or
admitted to trading on the business day that next precedes the day of exercise
or, if the Warrant Securities are not then listed or admitted to trading on any
registered national securities exchange, the average of the closing high bid
and low asked prices as reported on the OTC Bulletin Board Service (the “OTC Bulletin Board”) operated by the
Financial Industry Regulatory Authority, Inc. (“FINRA”) or, if not available on the OTC Bulletin Board, then
the average of the closing high bid and low asked prices as reported on any
other U.S. quotation medium or inter-dealer quotation system on such date, or
if on any such date the Warrant Securities are not listed or admitted to
trading on a registered national securities exchange, are not included in the
OTC Bulletin Board, and are not quoted on any other U.S. quotation medium or
inter-dealer quotation system, an amount equal to the same fraction of the
average of the closing bid and asked prices as furnished by any FINRA member
firm selected from time to time by the Company for that purpose at the close of
business on the business day that next precedes the day of exercise.

 

(g)       Whenever the Warrant Price then in effect
is adjusted as herein provided, the Company shall mail to each holder of the
Warrants at such holder’s address as it shall appear on the books of the
Company a statement setting forth the adjusted Warrant Price then and
thereafter effective under the provisions hereof, together with the facts, in
reasonable detail, upon which such adjustment is based.

 

(h)       Notwithstanding anything to the contrary
herein, in no event shall the Warrant Price, as adjusted in accordance with the
terms hereof, be less than the par value per share of [title of Preferred Stock
purchasable through exercise of Warrants].

 

3.5           Notice
to Warrantholders.
In case the Company shall (a) effect any dividend or distribution
described in Section 3.4(b), (b) effect any Reorganization Event, (c) make
any distribution on or in respect of the [title of Preferred Stock purchasable
through the exercise of the Warrants] in connection with the dissolution,
liquidation or winding up of the Company, or (d) reduce the then current
Warrant Price pursuant to Section 3.4(d), then the Company shall mail to
each holder of Warrants at such holder’s address as it shall appear on the
books of the Warrant Agent, at least ten days prior to the applicable date hereinafter
specified, a notice stating (x) the record date for such dividend or
distribution, or, if a record is not to be taken, the date as of which the
holders of record of [title of Preferred Stock purchasable through the exercise
of Warrants] that will be entitled to such dividend or distribution are to be
determined, (y) the date on which such Reorganization Event, dissolution,
liquidation or winding up is expected to become effective, and the date as of
which it is expected that holders of [title of Preferred Stock purchasable
through the exercise of the Warrants] of record shall be entitled to exchange
their shares of [title of Preferred Stock purchasable through the exercise of
the Warrants] for securities or other property deliverable upon such Reorganization
Event, dissolution, liquidation or winding up, or (z) the first date on
which the then current Warrant Price shall be reduced pursuant to Section 3.4(d).
No failure to mail such notice nor any defect therein or in the mailing thereof
shall affect any such transaction or any adjustment in the Warrant Price
required by Section 3.4.

 

3.6           [IF
THE WARRANTS ARE SUBJECT TO ACCELERATION BY THE COMPANY, INSERT—ACCELERATION OF
WARRANTS BY THE COMPANY.

 

(a)       
    At any time on or after                          ,
the Company shall have the right to accelerate any or all Warrants at any time
by causing them to expire at the close of business on the day next preceding a
specified date (the “Acceleration Date”),
if the Market Price (as hereinafter defined) of the [title of Preferred Stock
purchasable through the exercise of the Warrants] equals or exceeds 
                           percent (
          %) of the then effective
Warrant Price on any twenty Trading Days (as hereinafter defined) within a
period of thirty consecutive Trading Days ending no more than five Trading Days
prior to the date on which the Company gives notice to the Warrant Agent of its
election to accelerate the Warrants.

 

(b)        
   “Market Price” for each Trading Day shall be, if the [title of
Preferred Stock purchasable through the exercise of the Warrants] is listed or
admitted to trading on any registered national securities exchange, the last
reported sale price, regular way (or, if no such price is reported, the average
of the reported closing bid and asked prices, regular way) of [title of
Preferred Stock purchasable through the exercise of the Warrants], in either
case as reported on the principal registered national securities exchange on
which the [title of Preferred Stock purchasable through the exercise of the
Warrants] is listed or admitted to trading or, if not listed or admitted to
trading on any registered national securities exchange, the average of the
closing high bid and low asked prices as reported on the OTC Bulletin
Board operated by FINRA, or if not available on the OTC Bulletin Board, then
the average of the closing high bid and low asked prices as reported on any
other U.S. quotation medium or inter-dealer quotation system, or if on any such
date the shares of [title of Preferred Stock purchasable through the exercise
of the Warrants] are not listed or admitted to trading on a registered national
securities exchange, are not included in the OTC Bulletin Board, and are not
quoted on any other U.S. quotation medium or inter-dealer quotation system, the
average of the closing bid and asked prices as furnished by any FINRA member
firm selected from time to time by the Company for that purpose. “Trading Day”
shall be each Monday through Friday, other than any day on which securities are
not traded in the system or on the exchange that is the principal market for
the [title of Preferred Stock purchasable through the exercise of the
Warrants], as determined by the Board of Directors of the Company.

 

(c)        
   In
the event of an acceleration of less than all of the Warrants, the Warrant
Agent shall select the 

 

 

Warrants to be
accelerated by lot, pro rata or in such other manner as it deems, in its
discretion, to be fair and appropriate.

 

(d)       
    Notice of an acceleration specifying the Acceleration Date shall be
sent by mail first class, postage prepaid, to each registered holder of a
Warrant Certificate representing a Warrant accelerated at such holder’s address
appearing on the books of the Warrant Agent not more than sixty days nor less
than thirty days before the Acceleration Date. Such notice of an acceleration
also shall be given no more than twenty days, and no less than ten days, prior
to the mailing of notice to registered holders of Warrants pursuant to this Section 3.6,
by publication at least once in a newspaper of general circulation in the City
of New York.

 

(e)         
  Any
Warrant accelerated may be exercised until
[         ] p.m.,
[              ]
time, on the business day next preceding the Acceleration Date. The Warrant
Price shall be payable as provided in Section 2.]

 

ARTICLE
4

 

EXCHANGE
AND TRANSFER OF WARRANT CERTIFICATES

 

4.1           Exchange
and Transfer of Warrant Certificates. [If
Other Securities with Warrants which are immediately detachable—
Upon] [ If Other
Securities with Warrants which are not immediately detachable—
Prior to the Detachable Date, a Warrant Certificate may be exchanged or
transferred only together with the Other Security to which the Warrant Certificate
was initially attached, and only for the purpose of effecting or in conjunction
with an exchange or transfer of such Other Security. Prior to any Detachable
Date, each transfer of the Other Security shall operate also to transfer the
related Warrant Certificates. After the Detachable Date, upon] surrender at the
corporate trust office of the Warrant Agent, Warrant Certificates evidencing
Warrants may be exchanged for Warrant Certificates in other denominations
evidencing such Warrants or the transfer thereof may be registered in whole or
in part; provided that such other Warrant Certificates evidence Warrants for
the same aggregate number of Warrant Securities as the Warrant Certificates so
surrendered. The Warrant Agent shall keep, at its corporate trust office, books
in which, subject to such reasonable regulations as it may prescribe, it shall
register Warrant Certificates and exchanges and transfers of outstanding
Warrant Certificates, upon surrender of the Warrant Certificates to the Warrant
Agent at its corporate trust office for exchange or registration of transfer,
properly endorsed or accompanied by appropriate instruments of registration of
transfer and written instructions for transfer, all in form satisfactory to the
Company and the Warrant Agent. No service charge shall be made for any exchange
or registration of transfer of Warrant Certificates, but the Company may
require payment of a sum sufficient to cover any stamp or other tax or other
governmental charge that may be imposed in connection with any such exchange or
registration of transfer. Whenever any Warrant Certificates are so surrendered
for exchange or registration of transfer, an authorized officer of the Warrant
Agent shall manually countersign and deliver to the person or persons entitled
thereto a Warrant Certificate or Warrant Certificates duly authorized and
executed by the Company, as so requested. The Warrant Agent shall not be
required to effect any exchange or registration of transfer which will result
in the issuance of a Warrant Certificate evidencing a Warrant for a fraction of
a Warrant Security or a number of Warrants for a whole number of Warrant
Securities and a fraction of a Warrant Security. All Warrant Certificates
issued upon any exchange or registration of transfer of Warrant Certificates
shall be the valid obligations of the Company, evidencing the same obligations
and entitled to the same benefits under this Agreement as the Warrant
Certificate surrendered for such exchange or registration of transfer.

 

4.2           Treatment
of Holders of Warrant Certificates. [If
Other Securities and Warrants are not immediately detachable—
Prior to the Detachable Date, the Company, the Warrant Agent and all other
persons may treat the owner of the Other Security as the owner of the Warrant
Certificates initially attached thereto for any purpose and as the person
entitled to exercise the rights represented by the Warrants evidenced by such
Warrant Certificates, any notice to the contrary notwithstanding. After the
Detachable Date and prior to due presentment of a Warrant Certificate for
registration of transfer, the] [The] Company, the Warrant Agent and all other
persons may treat the registered holder of a Warrant Certificate as the
absolute owner thereof for any purpose and as the person entitled to exercise
the rights represented by the Warrants evidenced thereby, any notice to the
contrary notwithstanding.

 

4.3           Cancellation
of Warrant Certificates. Any Warrant Certificate surrendered for exchange, registration of transfer
or exercise of the Warrants evidenced thereby shall, if surrendered to the
Company, be delivered to the Warrant Agent and all Warrant Certificates
surrendered or so delivered to the Warrant Agent shall be promptly canceled by
the Warrant Agent and shall not be reissued and, except as expressly permitted
by this Agreement, no Warrant Certificate shall be issued hereunder in exchange
therefor or in lieu thereof. The Warrant Agent shall deliver to the Company
from time to time or otherwise dispose of canceled Warrant Certificates in a
manner satisfactory to the Company.

 

ARTICLE
5

 

CONCERNING
THE WARRANT AGENT

 

5.1           Warrant
Agent. The
Company hereby appoints
                            
as Warrant Agent of the Company in respect of the Warrants and the Warrant
Certificates upon the terms and subject to the conditions herein set forth, and
                          
hereby accepts such appointment. The Warrant Agent shall have the powers and
authority granted to and conferred upon it in the Warrant Certificates and
hereby and such further powers and authority to act on behalf of the Company as
the Company may hereafter grant to 

 

 

or confer upon it. All of
the terms and provisions with respect to such powers and authority contained in
the Warrant Certificates are subject to and governed by the terms and
provisions hereof.

 

5.2           Conditions
of Warrant Agent’s Obligations. The Warrant Agent accepts its obligations herein set
forth upon the terms and conditions hereof, including the following to all of
which the Company agrees and to all of which the rights hereunder of the
holders from time to time of the Warrant Certificates shall be subject:

 

(a)        
   Compensation and Indemnification. The Company agrees promptly to pay the
Warrant Agent the compensation to be agreed upon with the Company for all
services rendered by the Warrant Agent and to reimburse the Warrant Agent for
reasonable out-of-pocket expenses (including reasonable counsel fees) incurred
without negligence, bad faith or willful misconduct by the Warrant Agent in
connection with the services rendered hereunder by the Warrant Agent. The
Company also agrees to indemnify the Warrant Agent for, and to hold it harmless
against, any loss, liability or expense incurred without negligence, bad faith
or willful misconduct on the part of the Warrant Agent, arising out of or in
connection with its acting as Warrant Agent hereunder, including the reasonable
costs and expenses of defending against any claim of such liability.

 

(b)          
 Agent for the Company.  In acting under this Warrant Agreement and
in connection with the Warrant Certificates, the Warrant Agent is acting solely
as agent of the Company and does not assume any obligations or relationship of
agency or trust for or with any of the holders of Warrant Certificates or
beneficial owners of Warrants.

 

(c)           
Counsel. The
Warrant Agent may consult with counsel satisfactory to it, which may include
counsel for the Company, and the written advice of such counsel shall be full
and complete authorization and protection in respect of any action taken,
suffered or omitted by it hereunder in good faith and in accordance with the
advice of such counsel.

 

(d)           
Documents. The
Warrant Agent shall be protected and shall incur no liability for or in respect
of any action taken or omitted by it in reliance upon any Warrant Certificate,
notice, direction, consent, certificate, affidavit, statement or other paper or
document reasonably believed by it to be genuine and to have been presented or
signed by the proper parties.

 

(e) 
          Certain
Transactions. The
Warrant Agent, and its officers, directors and employees, may become the owner
of, or acquire any interest in, Warrants, with the same rights that it or they
would have if it were not the Warrant Agent hereunder, and, to the extent
permitted by applicable law, it or they may engage or be interested in any
financial or other transaction with the Company and may act on, or as
depositary, trustee or agent for, any committee or body of holders of Warrant
Securities or other obligations of the Company as freely as if it were not the
Warrant Agent hereunder. Nothing in this Warrant Agreement shall be deemed to
prevent the Warrant Agent from acting as trustee under any indenture to which
the Company is a party.

 

(f)    
       No Liability for Interest. Unless otherwise agreed with the
Company, the Warrant Agent shall have no liability for interest on any monies
at any time received by it pursuant to any of the provisions of this Agreement
or of the Warrant Certificates.

 

(g)    
       No Liability for Invalidity. The Warrant Agent shall have no
liability with respect to any invalidity of this Agreement or any of the
Warrant Certificates (except as to the Warrant Agent’s countersignature
thereon).

 

(h)     
      No Responsibility for Representations. The Warrant Agent shall not be
responsible for any of the recitals or representations herein or in the Warrant
Certificates (except as to the Warrant Agent’s countersignature thereon), all
of which are made solely by the Company.

 

(i)            No
Implied Obligations.
The Warrant Agent shall be obligated to perform only such duties as are herein
and in the Warrant Certificates specifically set forth and no implied duties or
obligations shall be read into this Agreement or the Warrant Certificates
against the Warrant Agent. The Warrant Agent shall not be under any obligation
to take any action hereunder which may tend to involve it in any expense or
liability, the payment of which within a reasonable time is not, in its
reasonable opinion, assured to it. The Warrant Agent shall not be accountable
or under any duty or responsibility for the use by the Company of any of the
Warrant Certificates authenticated by the Warrant Agent and delivered by it to
the Company pursuant to this Agreement or for the application by the Company of
the proceeds of the Warrant Certificates. The Warrant Agent shall have no duty
or responsibility in case of any default by the Company in the performance of
its covenants or agreements contained herein or in the Warrant Certificates or
in the case of the receipt of any written demand from a holder of a Warrant
Certificate with respect to such default, including, without limiting the
generality of the foregoing, any duty or responsibility to initiate or attempt
to initiate any proceedings at law or otherwise or, except as provided in Section 6.2
hereof, to make any demand upon the Company.

 

5.3           Resignation,
Removal and Appointment of Successors.

 

(a)      
     The Company agrees, for the benefit of the holders
from time to time of the Warrant Certificates, that there shall at all times be
a Warrant Agent hereunder until all the Warrants have been exercised or are no
longer exercisable.

 

(b)       
    The Warrant Agent may at any time resign as agent by giving written
notice to the Company of such 

 

 

intention on its part,
specifying the date on which its desired resignation shall become effective;
provided that such date shall not be less than three months after the date on
which such notice is given unless the Company otherwise agrees. The Warrant
Agent hereunder may be removed at any time by the filing with it of an
instrument in writing signed by or on behalf of the Company and specifying such
removal and the intended date when it shall become effective. Such resignation
or removal shall take effect upon the appointment by the Company, as
hereinafter provided, of a successor Warrant Agent (which shall be a bank or
trust company authorized under the laws of the jurisdiction of its organization
to exercise corporate trust powers) and the acceptance of such appointment by
such successor Warrant Agent. The obligation of the Company under Section 5.2(a) shall
continue to the extent set forth therein notwithstanding the resignation or
removal of the Warrant Agent.

 

(c)         
  In
case at any time the Warrant Agent shall resign, or shall be removed, or shall
become incapable of acting, or shall be adjudged a bankrupt or insolvent, or
shall commence a voluntary case under the Federal bankruptcy laws, as now or
hereafter constituted, or under any other applicable Federal or state
bankruptcy, insolvency or similar law or shall consent to the appointment of or
taking possession by a receiver, custodian, liquidator, assignee, trustee,
sequestrator (or other similar official) of the Warrant Agent or its property
or affairs, or shall make an assignment for the benefit of creditors, or shall
admit in writing its inability to pay its debts generally as they become due, or
shall take corporate action in furtherance of any such action, or a decree or
order for relief by a court having jurisdiction in the premises shall have been
entered in respect of the Warrant Agent in an involuntary case under the
Federal bankruptcy laws, as now or hereafter constituted, or any other
applicable Federal or state bankruptcy, insolvency or similar law, or a decree
or order by a court having jurisdiction in the premises shall have been entered
for the appointment of a receiver, custodian, liquidator, assignee, trustee,
sequestrator (or similar official) of the Warrant Agent or of its property or
affairs, or any public officer shall take charge or control of the Warrant
Agent or of its property or affairs for the purpose of rehabilitation, conservation,
winding up or liquidation, a successor Warrant Agent, qualified as aforesaid,
shall be appointed by the Company by an instrument in writing, filed with the
successor Warrant Agent. Upon the appointment as aforesaid of a successor
Warrant Agent and acceptance by the successor Warrant Agent of such
appointment, the Warrant Agent shall cease to be Warrant Agent hereunder.

 

(d)       
    Any successor Warrant Agent appointed hereunder shall execute,
acknowledge and deliver to its predecessor and to the Company an instrument
accepting such appointment hereunder, and thereupon such successor Warrant
Agent, without any further act, deed or conveyance, shall become vested with
all the authority, rights, powers, trusts, immunities, duties and obligations of
such predecessor with like effect as if originally named as Warrant Agent
hereunder, and such predecessor, upon payment of its charges and disbursements
then unpaid, shall thereupon become obligated to transfer, deliver and pay
over, and such successor Warrant Agent shall be entitled to receive, all
monies, securities and other property on deposit with or held by such
predecessor, as Warrant Agent hereunder.

 

(e)        
   Any
corporation into which the Warrant Agent hereunder may be merged or converted
or any corporation with which the Warrant Agent may be consolidated, or any
corporation resulting from any merger, conversion or consolidation to which the
Warrant Agent shall be a party, or any corporation to which the Warrant Agent
shall sell or otherwise transfer all or substantially all the assets and
business of the Warrant Agent, provided that it shall be qualified as
aforesaid, shall be the successor Warrant Agent under this Agreement without
the execution or filing of any paper or any further act on the part of any of
the parties hereto.

 

ARTICLE
6

 

MISCELLANEOUS

 

6.1           Amendment. This Agreement may be amended by the
parties hereto, without the consent of the holder of any Warrant Certificate,
for the purpose of curing any ambiguity, or of curing, correcting or
supplementing any defective provision contained herein, or making any other
provisions with respect to matters or questions arising under this Agreement as
the Company and the Warrant Agent may deem necessary or desirable; provided that
such action shall not materially adversely affect the interests of the holders
of the Warrant Certificates.

 

6.2           Notices
and Demands to the Company and Warrant Agent. If the Warrant Agent shall receive any notice or
demand addressed to the Company by the holder of a Warrant Certificate pursuant
to the provisions of the Warrant Certificates, the Warrant Agent shall promptly
forward such notice or demand to the Company.

 

6.3           Addresses. Any communication from the Company to
the Warrant Agent with respect to this Agreement shall be addressed to 
                         
, Attention: 
                           and any communication from the Warrant Agent
to the Company with respect to this Agreement shall be addressed to AMAG
Pharmaceuticals, Inc., 100 Hayden Avenue, Lexington, Massachusetts 02421,
Attention: Chief Financial Officer (or such other address as shall be specified
in writing by the Warrant Agent or by the Company).

 

6.4           Governing
Law. This
Agreement and each Warrant Certificate issued hereunder shall be governed by
and construed in accordance with the laws of the State of New York.

 

6.5           Delivery
of Prospectus.
The Company shall furnish to the Warrant Agent sufficient copies of a
prospectus 

 

 

meeting the requirements
of the Securities Act of 1933, as amended, relating to the Warrant Securities
deliverable upon exercise of the Warrants (the “Prospectus”), and the Warrant Agent agrees that upon the
exercise of any Warrant, the Warrant Agent will deliver to the holder of the
Warrant Certificate evidencing such Warrant, prior to or concurrently with the
delivery of the Warrant Securities issued upon such exercise, a Prospectus.

 

The Warrant Agent shall
not, by reason of any such delivery, assume any responsibility for the accuracy
or adequacy of such Prospectus.

 

6.6           Obtaining
of Governmental Approvals. The Company will from time to time take all action
which may be necessary to obtain and keep effective any and all permits,
consents and approvals of governmental agencies and authorities and securities
act filings under United States Federal and state laws (including without
limitation a registration statement in respect of the Warrants and Warrant
Securities under the Securities Act of 1933, as amended), which may be or
become requisite in connection with the issuance, sale, transfer, and delivery
of the Warrant Securities issued upon exercise of the Warrants, the issuance,
sale, transfer and delivery of the Warrants or upon the expiration of the
period during which the Warrants are exercisable.

 

6.7           Persons
Having Rights Under Warrant Agreement. Nothing in this Agreement shall give to any person
other than the Company, the Warrant Agent and the holders of the Warrant
Certificates any right, remedy or claim under or by reason of this Agreement.

 

6.8           Headings. The descriptive headings of the several
Articles and Sections of this Agreement are inserted for convenience only and
shall not control or affect the meaning or construction of any of the
provisions hereof.

 

6.9           Counterparts. This Agreement may be executed in any
number of counterparts, each of which as so executed shall be deemed to be an
original, but such counterparts shall together constitute but one and the same
instrument.

 

6.10         Inspection
of Agreement. A
copy of this Agreement shall be available at all reasonable times at the
principal corporate trust office of the Warrant Agent for inspection by the
holder of any Warrant Certificate. The Warrant Agent may require such holder to
submit his Warrant Certificate for inspection by it.

 

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

 

	
   

  	
  AMAG PHARMACEUTICALS, INC.

  
	
   

  	
   

  	
   

  
	
   

  	
  By

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  Its

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  WARRANT AGENT

  
	
   

  	
   

  	
   

  
	
   

  	
  By

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  Its

  	
   

  

 

[SIGNATURE PAGE TO
PREFERRED STOCK WARRANT AGREEMENT]

 

 

 

 

 

EXHIBIT
A

 

FORM OF
WARRANT CERTIFICATE

[FACE
OF WARRANT CERTIFICATE]

 

	
  [[Form if Warrants
  are attached to Other Securities and are not immediately detachable.]

  	
   

  	
  [Prior to
                      ,
  this Warrant Certificate cannot be transferred or exchanged unless attached
  to a [Title of Other Securities].]

  
	
  [Form of Legend if
  Warrants are not immediately exercisable.]

  	
   

  	
  [Prior to
                      ,
  Warrants evidenced by this Warrant Certificate cannot be exercised.]

  

 

EXERCISABLE ONLY
IF COUNTERSIGNED BY THE WARRANT AGENT AS PROVIDED HEREIN

 

VOID AFTER
[        ] P.M.,
[              ]
TIME, ON
                    ,

 

 

AMAG
PHARMACEUTICALS, INC.

WARRANT
CERTIFICATE REPRESENTING

WARRANTS
TO PURCHASE

[TITLE
OF WARRANT SECURITIES]

 

	
  No.

  	
   

  	
  Warrants

  

 

This certifies that
                       
or registered assigns is the registered owner of the above indicated number of
Warrants, each Warrant entitling such owner [ if Warrants are attached to Other Securities and are
not immediately detachable—, subject to the registered owner
qualifying as a “Holder” of this Warrant Certificate, as hereinafter defined),]
to purchase, at any time [after [
          ] p.m., [
              ]  time, on  
                         and] on or before [
        ] p.m., [
              ]  time, on  
                         shares of [Title of Warrant Securities] (the “Warrant Securities”), of AMAG
Pharmaceuticals, Inc. (the “Company”)
on the following basis: during the period from  
                       
, through and including                          
, the exercise price per Warrant Security will be $
           , subject to
adjustment as provided in the Warrant Agreement (as hereinafter defined) (the “Warrant Price”). The Holder may exercise
the Warrants evidenced hereby by providing certain information set forth on the
back hereof and by paying in full, in lawful money of the United States of
America, [in cash or by certified check or official bank check in New York
Clearing House funds] [by bank wire transfer in immediately available funds],
the Warrant Price for each Warrant Security with respect to which this Warrant
is exercised to the Warrant Agent (as hereinafter defined) and by surrendering
this Warrant Certificate, with the purchase form on the back hereof duly
executed, at the corporate trust office of [name of Warrant Agent], or its
successor as warrant agent (the “Warrant
Agent”), which is, on the date hereof, at the address specified on
the reverse hereof, and upon compliance with and subject to the conditions set
forth herein and in the Warrant Agreement (as hereinafter defined).

 

The term “Holder” as used herein shall mean [if Warrants are attached to Other
Securities and are not immediately detachable— prior
to  
                         (the “Detachable
Date”), the registered owner of the Company’s [title of Other
Securities] to which this Warrant Certificate was initially attached, and after
such Detachable Date,] the person in whose name at the time this Warrant
Certificate shall be registered upon the books to be maintained by the Warrant
Agent for that purpose pursuant to Section 4 of the Warrant Agreement.

 

The Warrants evidenced by
this Warrant Certificate may be exercised to purchase a whole number of Warrant
Securities in registered form. Upon any exercise of fewer than all of the
Warrants evidenced by this Warrant Certificate, there shall be issued to the
Holder hereof a new Warrant Certificate evidencing Warrants for the number of
Warrant Securities remaining unexercised.

 

This Warrant Certificate
is issued under and in accordance with the Warrant Agreement dated as of
                       ,
             (the “Warrant
Agreement”), between the Company and the Warrant Agent and is
subject to the terms and provisions contained in the Warrant Agreement, to all
of which terms and provisions the Holder of this Warrant Certificate consents
by acceptance hereof. Copies of the Warrant Agreement are on file at the
above-mentioned office of the Warrant Agent.

 

[If Warrants are attached to Other
Securities and are not immediately detachable — Prior to the
Detachable Date, this Warrant Certificate may be exchanged or transferred only
together with the [Title of Other Securities] (the “Other Securities”) to which this Warrant Certificate was
initially attached, and only for the purpose of effecting or in conjunction
with, an exchange or transfer of such Other Security. Additionally, on or prior
to the Detachable Date, each transfer of such Other Security on the register of
the Other Securities shall operate also to transfer this Warrant Certificate.
After such date, transfer of this] [If Warrants are attached to Other Securities and are
immediately detachable — 
Transfer of this] Warrant Certificate may be registered when this
Warrant Certificate is surrendered at the corporate trust office of the Warrant
Agent by the registered owner or such owner’s assigns, in the manner and
subject to the limitations provided in the Warrant Agreement.

 

[If Other Securities with Warrants
which are not immediately detachable — Except as provided in the
immediately preceding paragraph, after] [ If Other Securities with Warrants which are immediately
detachable or Warrants alone — 
After] countersignature by the Warrant Agent and prior to the expiration
of this Warrant Certificate, this Warrant Certificate may be exchanged at the
corporate trust office of the Warrant Agent for Warrant Certificates
representing Warrants for the same aggregate number of Warrant Securities.

 

This Warrant Certificate
shall not entitle the Holder hereof to any of the rights of a holder of the
Warrant Securities, including, without limitation, the right to receive
payments of dividends or distributions, if any, on the Warrant Securities
(except to the extent set forth in the Warrant Agreement) or to exercise any
voting rights.

 

Reference is hereby made
to the further provisions of this Warrant Certificate set forth on the reverse
hereof, which further provisions shall for all purposes have the same effect as
if set forth at this place.

 

This Warrant Certificate shall not be valid or
obligatory for any purpose until countersigned by the Warrant Agent.

 

 

IN WITNESS WHEREOF, the Company has caused this Warrant to be executed in
its name and on its behalf by the facsimile signatures of its duly authorized
officers.

 

	
  Dated:

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  AMAG PHARMACEUTICALS, INC.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  By:

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  Its:

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  Countersigned:

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  As Warrant Agent

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  By:

  	
   

  
	
   

  	
   

  	
   

  	
  Authorized
  Signature

  

 

 

 

[REVERSE
OF WARRANT CERTIFICATE]

 

(Instructions
for Exercise of Warrant)

 

To exercise any Warrants
evidenced hereby for Warrant Securities (as hereinafter defined), the Holder
must pay, in lawful money of the United States of America, [in cash or by certified
check or official bank check in New York Clearing House funds] [by bank wire
transfer in immediately available funds], the Warrant Price in full for
Warrants exercised, to [Warrant Agent] [address of Warrant Agent], Attn: 
                     
, which payment must specify the name of the Holder and the number of Warrants
exercised by such Holder. In addition, the Holder must complete the information
required below and present this Warrant Certificate in person or by mail
(certified or registered mail is recommended) to the Warrant Agent at the
appropriate address set forth above. This Warrant Certificate, completed and
duly executed, must be received by the Warrant Agent within five business days
of the payment.

 

(To be executed
upon exercise of Warrants)

 

The undersigned hereby
irrevocably elects to exercise
                 
Warrants, evidenced by this Warrant Certificate, to purchase 
                   shares of the [Title of Warrant Securities]
(the “Warrant Securities”), of
AMAG Pharmaceuticals, Inc. and represents that he has tendered payment for
such Warrant Securities, in lawful money of the United States of America, [in
cash or by certified check or official bank check in New York Clearing House
funds] [by bank wire transfer in immediately available funds], to the order of
AMAG Pharmaceuticals, Inc., c/o [insert name and address of Warrant
Agent], in the amount of $
          in accordance with the terms hereof. The
undersigned requests that said Warrant Securities be in fully registered form
in the authorized denominations, registered in such names and delivered all as
specified in accordance with the instructions set forth below.

 

If the number of Warrants
exercised is less than all of the Warrants evidenced hereby, the undersigned
requests that a new Warrant Certificate evidencing the Warrants for the number
of Warrant Securities remaining unexercised be issued and delivered to the
undersigned unless otherwise specified in the instructions below.

 

	
  Dated:

  	
   

  	
   

  	
  Name:

  	
   

  
	
   

  	
  Please Print

  
	
   

  	
   

  
	
  Address:

  	
   

  	
   

  	
   

  

 

 

	
   

  	
   

  
	
  (Insert Social Security
  or Other Identifying Number of Holder)

  

 

 

	
  Signature Guaranteed:

  	
   

  	
   

  
	
   

  	
  Signature

  	
   

  

 

(Signature must conform
in all respects to name of holder as specified on the face of this Warrant
Certificate and must bear a signature guarantee by a FINRA member firm).

 

This Warrant may be
exercised at the following addresses:

 

	
  By hand at:

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  By mail at:

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  

 

[Instructions as to form
and delivery of Warrant Securities and, if applicable, Warrant Certificates
evidencing Warrants for the number of Warrant Securities remaining
unexercised—complete as appropriate.]

 

 

ASSIGNMENT

 

[Form of
assignment to be executed if Warrant Holder desires to transfer Warrant)

 

FOR VALUE RECEIVED,
                    
hereby sells, assigns and transfers unto:

 

	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  (Please print name and
  address including zip code)

  	
   

  	
  Please print Social
  Security or other identifying number

  

 

the right represented by
the within Warrant to purchase
                    
shares of [Title of Warrant Securities] of AMAG Pharmaceuticals, Inc. to
which the within Warrant relates and appoints 
                      attorney to transfer such right on the books
of the Warrant Agent with full power of substitution in the premises.

 

	
  Dated:

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  Signature

  

 

(Signature must conform
in all respects to name of holder as specified on the face of the Warrant)

 

Signature GuaranteedEXHIBIT
4.13

 

AMAG
PHARMACEUTICALS, INC.

 

and

 

[·], AS WARRANT AGENT

 

FORM OF
DEBT SECURITIES

WARRANT
AGREEMENT

 

DATED
AS OF [·]

 

 

AMAG
PHARMACEUTICALS, INC.

 

FORM OF
DEBT SECURITIES WARRANT AGREEMENT

 

DEBT
SECURITIES WARRANT AGREEMENT (this “Agreement”), dated as of
                    
between  AMAG PHARMACEUTICALS, INC., a Delaware corporation (the “Company”)
and                      
, a [corporation] [national banking association] organized and existing under
the laws of                        and having a corporate trust office in
                    
, as warrant agent (the “Warrant Agent”).

 

WHEREAS, the Company has entered into an indenture dated as of
[                    
(the “Senior Indenture”), with
                    
, as trustee (such trustee, and any successors to such trustee, herein called
the “Senior Trustee”), providing for the issuance from time to time of its
unsubordinated debt securities, to be issued in one or more series as provided
in the Senior Indenture (the “Debt Securities”);] [
                      (the “Subordinated Indenture”), with
                    
, as trustee (such trustee, and any successors to such trustee, herein called
the “Subordinated Trustee”), providing for the issuance from time to time of
its subordinated debt securities, to be issued in one or more series as
provided in the Subordinated Indenture (the “Debt Securities”);]

 

WHEREAS, the Company proposes to sell [If Warrants are sold
with other securities- title of such other securities being offered (the “Other
Securities”) with] warrant certificates evidencing one or more warrants (the “Warrants”
or, individually, a “Warrant”) representing the right to purchase [title of
Debt Securities purchasable through exercise of Warrants] (the “Warrant Debt
Securities”), such warrant certificates and other warrant certificates issued
pursuant to this Agreement being herein called the “Warrant Certificates,” and

 

WHEREAS, the Company desires the Warrant Agent to act on
behalf of the Company, and the Warrant Agent is willing so to act, in
connection with the issuance, registration, transfer, exchange, exercise and
replacement of the Warrant Certificates, and in this Agreement wishes to set
forth, among other things, the form and provisions of the Warrant Certificates
and the terms and conditions on which they may be issued, registered,
transferred, exchanged, exercised and replaced.

 

NOW, THEREFORE, in consideration of the premises and of the mutual
agreements herein contained, the parties hereto agree as follows:

 

ARTICLE
1

 

ISSUANCE
OF WARRANTS AND EXECUTION AND DELIVERY OF WARRANT

CERTIFICATES

 

1.1
Issuance of Warrants. [If Warrants alone—Upon issuance, each Warrant Certificate shall
evidence one or more Warrants.] [If Other Securities and Warrants—Warrant
Certificates shall be [initially] issued in connection with the issuance of the
Other Securities [but shall be separately transferable on and after                        (the “Detachable Date”)] [and shall not be
separately transferable] and each Warrant Certificate shall evidence one or
more Warrants.] [If Other Securities and Warrants—Warrant Certificates shall be
initially issued in units with the Other Securities and each Warrant
Certificate included in such a unit shall evidence                        Warrants for each [$
                      principal amount] [
                    
shares] of Other Securities included in such unit].

 

1.2
Execution and Delivery of Warrant Certificates. Each Warrant Certificate, whenever issued, shall be
in registered form substantially in the form set forth in Exhibit A
hereto, shall be dated the date of its countersignature by the Warrant Agent
and may have such letters, numbers, or other marks of identification or
designation and such legends or endorsements printed, lithographed or engraved
thereon as the officers of the Company executing the same may approve
(execution thereof to be conclusive evidence of such approval) and as are not
inconsistent with the provisions of this Agreement, or as may be required to
comply with any law or with any rule or regulation made pursuant thereto
or with any rule or regulation of any securities exchange on which the
Warrants may be listed, or to conform to usage. The Warrant Certificates shall
be signed on behalf of the Company by any of its present or future chief
executive officers, presidents, senior vice presidents, vice presidents, chief
financial officers, chief legal officers, treasurers, assistant treasurers,
controllers, assistant controllers, secretaries or assistant secretaries under its
corporate seal reproduced thereon. Such signatures may be manual or facsimile
signatures of such authorized officers and may be imprinted or otherwise
reproduced on the Warrant Certificates. The seal of the Company may be in the
form of a facsimile thereof and may be impressed, affixed, imprinted or
otherwise reproduced on the Warrant Certificates.

 

No Warrant Certificate
shall be valid for any purpose, and no Warrant evidenced thereby shall be
exercisable, until such Warrant Certificate has been countersigned by the
manual signature of the Warrant Agent. Such signature by the Warrant Agent upon
any Warrant Certificate executed by the Company shall be conclusive evidence
that the Warrant Certificate so countersigned has been

 

 

duly issued hereunder.

 

In case any officer of
the Company who shall have signed any of the Warrant Certificates either
manually or by facsimile signature shall cease to be such officer before the
Warrant Certificates so signed shall have been countersigned and delivered by
the Warrant Agent, such Warrant Certificates may be countersigned and delivered
notwithstanding that the person who signed such Warrant Certificates ceased to
be such officer of the Company; and any Warrant Certificate may be signed on
behalf of the Company by such persons as, at the actual date of the execution
of such Warrant Certificate, shall be the proper officers of the Company,
although at the date of the execution of this Agreement any such person was not
such officer.

 

The term “holder” or “holder
of a Warrant Certificate” as used herein shall mean any person in whose name at
the time any Warrant Certificate shall be registered upon the books to be
maintained by the Warrant Agent for that purpose [If Other Securities and
Warrants are not immediately detachable—or upon the registration of the Other
Securities prior to the Detachable Date. Prior to the Detachable Date, the
Company will, or will cause the registrar of the Other Securities to, make
available at all times to the Warrant Agent such information as to holders of
the Other Securities as may be necessary to keep the Warrant Agent’s records up
to date].

 

1.3
Issuance of Warrant Certificates. Warrant Certificates evidencing the right to purchase
Warrant Debt Securities may be executed by the Company and delivered to the
Warrant Agent upon the execution of this Warrant Agreement or from time to time
thereafter. The Warrant Agent shall, upon receipt of Warrant Certificates duly
executed on behalf of the Company, countersign such Warrant Certificates and shall
deliver such Warrant Certificates to or upon the order of the Company.

 

ARTICLE
2

 

WARRANT
PRICE, DURATION AND EXERCISE OF WARRANTS

 

2.1
Warrant Price.
During the period specified in Section 2.2, each Warrant shall, subject to
the terms of this Warrant Agreement and the applicable Warrant Certificate,
entitle the holder thereof, to purchase the principal amount of Warrant Debt
Securities specified in the applicable Warrant Certificate at an exercise price
of                      
% of the principal amount thereof [plus accrued amortization, if any, of the
original issue discount of the Warrant Debt Securities] [plus accrued interest,
if any, from the most recent date from which interest shall have been paid on
the Warrant Debt Securities or, if no interest shall have been paid on the
Warrant Debt Securities, from the date of their initial issuance.] [The
original issue discount ($
                      for each $1,000 principal amount of Warrant
Debt Securities) will be amortized at a 
                    
% annual rate, computed on a[n] [semi-] annual basis [using a 360-day year
consisting of twelve 30-day months].] Such purchase price for the Warrant Debt
Securities is referred to in this Agreement as the “Warrant Price.”

 

2.2
Duration of Warrants. Each Warrant Certificate may be exercised in whole or in part at any
time, as specified herein, on or after [the date thereof] [
                    
] and at or before [
                    
] p.m., [City] time, on                        or such later date as the Company may
designate by notice to the Warrant Agent and the holders of Warrant
Certificates mailed to their addresses as set forth in the record books of the
Warrant Agent (the “Expiration Date”). Each Warrant not exercised at or before
[                     
] p.m., [City] time, on the Expiration Date shall become void, and all
rights of the holder of the Warrant Certificate evidencing such Warrant under
this Agreement shall cease.

 

2.3
Exercise Of Warrants.

 

(a) During the period specified in Section 2.2,
the Warrants may be exercised to purchase a whole number of Warrant Debt
Securities in registered form by providing certain information as set forth on
the reverse side of the Warrant Certificate and by paying in full, in lawful
money of the United States of America, [in cash or by certified check or
official bank check in New York Clearing House funds] [by bank wire transfer in
immediately available funds] the Warrant Price for each Warrant Debt Security
with respect to which a Warrant is being exercised to the Warrant Agent at its
corporate trust office, provided that such exercise is subject to receipt
within five business days of such payment by the Warrant Agent of the Warrant
Certificate with the form of election to purchase Warrant Debt Securities set
forth on the reverse side of the Warrant Certificate properly completed and
duly executed. The date on which payment in full of the Warrant Price is
received by the Warrant Agent shall, subject to receipt of the Warrant
Certificate as aforesaid, be deemed to be the date on which the Warrant is
exercised; provided, however, that if, at the date of receipt of such Warrant
Certificates and payment in full of the Warrant Price, the transfer books for
the Warrant Debt Securities purchasable upon the exercise of such Warrants
shall be closed, no such receipt of such Warrant Certificates and no such
payment of such Warrant Price shall be effective to constitute the person so
designated to be named as the holder of record of such Warrant Debt Securities
on such date, but shall be effective to constitute such person as the holder of
record of such Warrant Debt Securities for all purposes at the opening of
business on the next succeeding day on which the transfer books for the Warrant
Debt Securities purchasable upon the exercise of such Warrants shall be opened,
and the certificates for the Warrant Debt Securities in respect of which such
Warrants are then exercised shall be issuable as of the date on such next
succeeding day on which the transfer books shall next be opened, and until such
date the Company shall be under no duty to deliver any certificate for such
Warrant Debt Securities. The Warrant Agent shall deposit all funds received by
it in payment of the Warrant Price in an account of the Company maintained with
it and shall advise the

 

 

Company by telephone at
the end of each day on which a payment for the exercise of Warrants is received
of the amount so deposited to its account. The Warrant Agent shall promptly
confirm such telephone advice to the Company in writing.

 

(b) The Warrant Agent shall, from time to
time, as promptly as practicable, advise the Company of (i) the number of
Warrant Debt Securities with respect to which Warrants were exercised, (ii) the
instructions of each holder of the Warrant Certificates evidencing such
Warrants with respect to delivery of the Warrant Debt Securities to which such
holder is entitled upon such exercise, (iii) delivery of Warrant
Certificates evidencing the balance, if any, of the Warrants for the remaining
Warrant Debt Securities after such exercise, and (iv) such other
information as the Company or the [Senior] [Subordinated] Trustee shall
reasonably require.

 

(c) As soon as practicable after the exercise
of any Warrant, the Company shall issue, pursuant to the Indenture, in
authorized denominations, to or upon the order of the holder of the Warrant
Certificate evidencing such Warrant, the Warrant Debt Securities to which such
holder is entitled, in fully registered form, registered in such name or names
as may be directed by such holder. If fewer than all of the Warrants evidenced
by such Warrant Certificate are exercised, the Company shall execute, and an
authorized officer of the Warrant Agent shall manually countersign and deliver,
a new Warrant Certificate evidencing Warrants for the number of Warrant Debt
Securities remaining unexercised.

 

(d) The Company shall not be required to pay
any stamp or other tax or other governmental charge required to be paid in
connection with any transfer involved in the issue of the Warrant Debt
Securities, and in the event that any such transfer is involved, the Company
shall not be required to issue or deliver any Warrant Debt Securities until
such tax or other charge shall have been paid or it has been established to the
Company’s satisfaction that no such tax or other charge is due.

 

(e) Prior to the issuance of any Warrants
there shall have been reserved, and the Company shall at all times through the
Expiration Date keep reserved, out of its authorized but unissued Warrant Debt
Securities, a number of shares sufficient to provide for the exercise of the
Warrants.

 

ARTICLE
3

 

OTHER
PROVISIONS RELATING TO RIGHTS OF HOLDERS OF WARRANT

CERTIFICATES

 

3.1
No Rights As Holders of Warrant Debt Securities Conferred By Warrants or Warrant
Certificates. No
Warrant Certificate or Warrant evidenced thereby shall entitle the holder
thereof to any of the rights of a holder of Warrant Debt Securities, including,
without limitation, the right to receive the payment of principal of (or premium,
if any) or interest, if any, on the Warrant Debt Securities or to enforce any
of the covenants in the Indenture.

 

3.2
Lost, Stolen, Mutilated or Destroyed Warrant Certificates. Upon receipt by the Warrant Agent of
evidence reasonably satisfactory to it and the Company of the ownership of and
the loss, theft, destruction or mutilation of any Warrant Certificate and/or
indemnity reasonably satisfactory to the Warrant Agent and the Company and, in
the case of mutilation, upon surrender of the mutilated Warrant Certificate to
the Warrant Agent for cancellation, then, in the absence of notice to the
Company or the Warrant Agent that such Warrant Certificate has been acquired by
a bona fide purchaser, the Company shall execute, and an authorized officer of the
Warrant Agent shall manually countersign and deliver, in exchange for or in
lieu of the lost, stolen, destroyed or mutilated Warrant Certificate, a new
Warrant Certificate of the same tenor and evidencing Warrants for a like
principal amount of Warrant Debt Securities. Upon the issuance of any new
Warrant Certificate under this Section 3.2, the Company may require the
payment of a sum sufficient to cover any tax or other governmental charge that
may be imposed in relation thereto and any other expenses (including the fees
and expenses of the Warrant Agent) in connection therewith. Every substitute
Warrant Certificate executed and delivered pursuant to this Section 3.2 in
lieu of any lost, stolen or destroyed Warrant Certificate shall represent an
additional contractual obligation of the Company, whether or not the lost,
stolen or destroyed Warrant Certificate shall be at any time enforceable by
anyone, and shall be entitled to the benefits of this Agreement equally and
proportionately with any and all other Warrant Certificates duly executed and
delivered hereunder. The provisions of this Section 3.2 are exclusive and
shall preclude (to the extent lawful) all other rights and remedies with
respect to the replacement of mutilated, lost, stolen or destroyed Warrant
Certificates.

 

3.3
Holder Of Warrant Certificate May Enforce Rights. Notwithstanding any of the provisions of
this Agreement, any holder of any Warrant Certificate, without the consent of
the Warrant Agent, the [Senior] [Subordinated] Trustee, the holder of any
Warrant Debt Securities or the holder of any other Warrant Certificate, may, in
such holder’s own behalf and for such holder’s own benefit, enforce, and may
institute and maintain any suit, action or proceeding against the Company
suitable to enforce, or otherwise in respect of, such holder’s right to
exercise the Warrants evidenced by such holder’s Warrant Certificate in the
manner provided in such holder’s Warrant Certificates and in this Agreement.

 

3.4
Merger, Sale, Conveyance or Lease. In case of (a) any share exchange, merger or
similar transaction of the Company with or into another person or entity (other
than a share exchange, merger or similar transaction in which the Company is
the acquiring or surviving corporation) or (b) the sale, exchange, lease,
transfer or other disposition of all or substantially all of the properties and

 

 

assets of the Company as
an entirety (in any such case, a “Reorganization Event”), then, as a condition
of such Reorganization Event, lawful provisions shall be made, and duly
executed documents evidencing the same from the Company’s successor shall be
delivered to the holders of the Warrants, so that such successor shall succeed
to and be substituted for the Company, and assume all the Company’s obligations
under, this Agreement and the Warrants. The Company shall thereupon be relieved
of any further obligation hereunder or under the Warrants, and the Company as
the predecessor corporation may thereupon or at any time thereafter be
dissolved, wound up or liquidated. Such successor or assuming entity thereupon
may cause to be signed, and may issue either in its own name or in the name of
the Company, any or all of the Warrants issuable hereunder which heretofore
shall not have been signed by the Company, and may execute and deliver
securities in its own name, in fulfillment of its obligations to deliver
Warrant Debt Securities upon exercise of the Warrants. All the Warrants so
issued shall in all respects have the same legal rank and benefit under this
Agreement as the Warrants theretofore or thereafter issued in accordance with
the terms of this Agreement as though all of such Warrants had been issued at
the date of the execution hereof. In any case of any such Reorganization Event,
such changes in phraseology and form (but not in substance) may be made in the
Warrants thereafter to be issued as may be appropriate. The Warrant Agent may
receive a written opinion of legal counsel as conclusive evidence that any such
Reorganization Event complies with the provisions of this Section 3.4.

 

3.5
Notice To Warrantholders. In case the Company shall (a) effect any Reorganization Event or (b) make
any distribution on or in respect of the [title of Warrant Debt Securities] in
connection with the dissolution, liquidation or winding up of the Company, then
the Company shall mail to each holder of Warrants at such holder’s address as
it shall appear on the books of the Warrant Agent, at least ten days prior to
the applicable date hereinafter specified, a notice stating the date on which
such Reorganization Event, dissolution, liquidation or winding up is expected
to become effective, and the date as of which it is expected that holders of
[title of Warrant Debt Securities] of record shall be entitled to exchange
their shares of [title of Warrant Debt Securities] for securities or other
property deliverable upon such Reorganization Event, dissolution, liquidation
or winding up. No failure to mail such notice nor any defect therein or in the
mailing thereof shall affect any such transaction.

 

ARTICLE
4

 

EXCHANGE
AND TRANSFER OF WARRANT CERTIFICATES

 

4.1
Exchange and Transfer of Warrant Certificates. [If Other Securities with Warrants which are
immediately detachable—Upon] [If Other Securities with Warrants which are not
immediately detachable—Prior to the Detachable Date, a Warrant Certificate may
be exchanged or transferred only together with the Other Security to which the
Warrant Certificate was initially attached, and only for the purpose of
effecting or in conjunction with an exchange or transfer of such Other
Security. Prior to any Detachable Date, each transfer of the Other Security
shall operate also to transfer the related Warrant Certificates. After the
Detachable Date, upon] surrender at the corporate trust office of the Warrant
Agent, Warrant Certificates evidencing Warrants may be exchanged for Warrant
Certificates in other denominations evidencing such Warrants or the transfer
thereof may be registered in whole or in part; provided that such other Warrant
Certificates evidence Warrants for the same aggregate principal amount of
Warrant Debt Securities as the Warrant Certificates so surrendered. The Warrant
Agent shall keep, at its corporate trust office, books in which, subject to
such reasonable regulations as it may prescribe, it shall register Warrant
Certificates and exchanges and transfers of outstanding Warrant Certificates,
upon surrender of the Warrant Certificates to the Warrant Agent at its
corporate trust office for exchange or registration of transfer, properly endorsed
or accompanied by appropriate instruments of registration of transfer and
written instructions for transfer, all in form satisfactory to the Company and
the Warrant Agent. No service charge shall be made for any exchange or
registration of transfer of Warrant Certificates, but the Company may require
payment of a sum sufficient to cover any stamp or other tax or other
governmental charge that may be imposed in connection with any such exchange or
registration of transfer. Whenever any Warrant Certificates are so surrendered
for exchange or registration of transfer, an authorized officer of the Warrant
Agent shall manually countersign and deliver to the person or persons entitled
thereto a Warrant Certificate or Warrant Certificates duly authorized and
executed by the Company, as so requested. The Warrant Agent shall not be
required to effect any exchange or registration of transfer which will result
in the issuance of a Warrant Certificate evidencing a Warrant for a fraction of
a Warrant Debt Security or a number of Warrants for a whole number of Warrant
Debt Securities and a fraction of a Warrant Debt Security. All Warrant
Certificates issued upon any exchange or registration of transfer of Warrant
Certificates shall be the valid obligations of the Company, evidencing the same
obligations and entitled to the same benefits under this Agreement as the
Warrant Certificate surrendered for such exchange or registration of transfer.

 

4.2
Treatment of Holders of Warrant Certificates. [If Other Securities and Warrants are not immediately
detachable—Prior to the Detachable Date, the Company, the Warrant Agent and all
other persons may treat the owner of the Other Security as the owner of the
Warrant Certificates initially attached thereto for any purpose and as the
person entitled to exercise the rights represented by the Warrants evidenced by
such Warrant Certificates, any notice to the contrary notwithstanding. After
the Detachable Date and prior to due presentment of a Warrant Certificate for
registration of transfer, the] [The] Company, the Warrant Agent and all other
persons may treat the registered holder of a Warrant Certificate as the
absolute owner thereof for any purpose and as the person entitled to exercise
the rights represented by the Warrants evidenced thereby, any notice to the
contrary notwithstanding.

 

 

4.3
Cancellation of Warrant Certificates. Any Warrant Certificate surrendered for exchange,
registration of transfer or exercise of the Warrants evidenced thereby shall,
if surrendered to the Company, be delivered to the Warrant Agent and all
Warrant Certificates surrendered or so delivered to the Warrant Agent shall be
promptly canceled by the Warrant Agent and shall not be reissued and, except as
expressly permitted by this Agreement, no Warrant Certificate shall be issued
hereunder in exchange therefor or in lieu thereof. The Warrant Agent shall
deliver to the Company from time to time or otherwise dispose of canceled
Warrant Certificates in a manner satisfactory to the Company.

 

ARTICLE
5

 

CONCERNING
THE WARRANT AGENT

 

5.1
Warrant Agent.
The Company hereby appoints                     
as Warrant Agent of the Company in respect of the Warrants and the Warrant
Certificates upon the terms and subject to the conditions herein set forth, and
                    
hereby accepts such appointment. The Warrant Agent shall have the powers and
authority granted to and conferred upon it in the Warrant Certificates and
hereby and such further powers and authority to act on behalf of the Company as
the Company may hereafter grant to or confer upon it. All of the terms and
provisions with respect to such powers and authority contained in the Warrant
Certificates are subject to and governed by the terms and provisions hereof.

 

5.2
Conditions of Warrant Agent’s Obligations. The Warrant Agent accepts its obligations herein set
forth upon the terms and conditions hereof, including the following to all of
which the Company agrees and to all of which the rights hereunder of the
holders from time to time of the Warrant Certificates shall be subject:

 

(a) Compensation
and Indemnification.
The Company agrees promptly to pay the Warrant Agent the compensation to be
agreed upon with the Company for all services rendered by the Warrant Agent and
to reimburse the Warrant Agent for reasonable out-of-pocket expenses (including
reasonable counsel fees) incurred without negligence, bad faith or willful
misconduct by the Warrant Agent in connection with the services rendered
hereunder by the Warrant Agent. The Company also agrees to indemnify the
Warrant Agent for, and to hold it harmless against, any loss, liability or
expense incurred without negligence, bad faith or willful misconduct on the
part of the Warrant Agent, arising out of or in connection with its acting as
Warrant Agent hereunder, including the reasonable costs and expenses of
defending against any claim of such liability.

 

(b) Agent
for the Company.
In acting under this Warrant Agreement and in connection with the Warrant
Certificates, the Warrant Agent is acting solely as agent of the Company and
does not assume any obligations or relationship of agency or trust for or with
any of the holders of Warrant Certificates or beneficial owners of Warrants.

 

(c) Counsel. The Warrant Agent may consult with
counsel satisfactory to it, which may include counsel for the Company, and the
written advice of such counsel shall be full and complete authorization and
protection in respect of any action taken, suffered or omitted by it hereunder
in good faith and in accordance with the advice of such counsel.

 

(d) Documents. The Warrant Agent shall be protected
and shall incur no liability for or in respect of any action taken or omitted
by it in reliance upon any Warrant Certificate, notice, direction, consent,
certificate, affidavit, statement or other paper or document reasonably
believed by it to be genuine and to have been presented or signed by the proper
parties.

 

(e) Certain
Transactions. The
Warrant Agent, and its officers, directors and employees, may become the owner
of, or acquire any interest in, Warrants, with the same rights that it or they
would have if it were not the Warrant Agent hereunder, and, to the extent
permitted by applicable law, it or they may engage or be interested in any
financial or other transaction with the Company and may act on, or as
depositary, trustee or agent for, any committee or body of holders of Warrant
Debt Securities or other obligations of the Company as freely as if it were not
the Warrant Agent hereunder. Nothing in this Warrant Agreement shall be deemed
to prevent the Warrant Agent from acting as [Senior] [Subordinated] Trustee
under the [Senior] [Subordinated] Indenture.

 

(f) No
Liability for Interest. Unless otherwise agreed with the Company, the Warrant Agent shall have
no liability for interest on any monies at any time received by it pursuant to
any of the provisions of this Agreement or of the Warrant Certificates.

 

(g) No
Liability for Invalidity. The Warrant Agent shall have no liability with respect to any
invalidity of this Agreement or any of the Warrant Certificates (except as to
the Warrant Agent’s countersignature thereon).

 

(h) No
Responsibility for Representations. The Warrant Agent shall not be responsible for any of
the recitals or representations herein or in the Warrant Certificates (except
as to the Warrant Agent’s countersignature thereon), all of which are made
solely by the Company.

 

(i) No
Implied Obligations.
The Warrant Agent shall be obligated to perform only such duties as are herein
and in the Warrant Certificates specifically set forth and no implied duties or
obligations shall be read into this Agreement or the Warrant Certificates
against the Warrant Agent. The Warrant Agent shall not be under any obligation
to take any action hereunder which may tend to involve it in any expense or
liability, the payment of which within a reasonable time is not, in its
reasonable opinion, assured to it. The

 

 

Warrant Agent shall not
be accountable or under any duty or responsibility for the use by the Company
of any of the Warrant Certificates authenticated by the Warrant Agent and
delivered by it to the Company pursuant to this Agreement or for the
application by the Company of the proceeds of the Warrant Certificates. The
Warrant Agent shall have no duty or responsibility in case of any default by
the Company in the performance of its covenants or agreements contained herein
or in the Warrant Certificates or in the case of the receipt of any written
demand from a holder of a Warrant Certificate with respect to such default, including,
without limiting the generality of the foregoing, any duty or responsibility to
initiate or attempt to initiate any proceedings at law or otherwise or, except
as provided in Section 6.2 hereof, to make any demand upon the Company.

 

5.3
Resignation , Removal and Appointment of Successors.

 

(a) The Company agrees, for the benefit of
the holders from time to time of the Warrant Certificates, that there shall at
all times be a Warrant Agent hereunder until all the Warrants have been
exercised or are no longer exercisable.

 

(b) The Warrant Agent may at any time resign
as agent by giving written notice to the Company of such intention on its part,
specifying the date on which its desired resignation shall become effective;
provided that such date shall not be less than three months after the date on
which such notice is given unless the Company otherwise agrees. The Warrant
Agent hereunder may be removed at any time by the filing with it of an
instrument in writing signed by or on behalf of the Company and specifying such
removal and the intended date when it shall become effective. Such resignation
or removal shall take effect upon the appointment by the Company, as
hereinafter provided, of a successor Warrant Agent (which shall be a bank or
trust company authorized under the laws of the jurisdiction of its organization
to exercise corporate trust powers) and the acceptance of such appointment by
such successor Warrant Agent. The obligation of the Company under Section 5.2(a) shall
continue to the extent set forth therein notwithstanding the resignation or
removal of the Warrant Agent.

 

(c) In case at any time the Warrant Agent
shall resign, or shall be removed, or shall become incapable of acting, or
shall be adjudged a bankrupt or insolvent, or shall commence a voluntary case
under the Federal bankruptcy laws, as now or hereafter constituted, or under
any other applicable Federal or state bankruptcy, insolvency or similar law or
shall consent to the appointment of or taking possession by a receiver,
custodian, liquidator, assignee, trustee, sequestrator (or other similar
official) of the Warrant Agent or its property or affairs, or shall make an
assignment for the benefit of creditors, or shall admit in writing its
inability to pay its debts generally as they become due, or shall take
corporate action in furtherance of any such action, or a decree or order for
relief by a court having jurisdiction in the premises shall have been entered
in respect of the Warrant Agent in an involuntary case under the Federal bankruptcy
laws, as now or hereafter constituted, or any other applicable Federal or state
bankruptcy, insolvency or similar law, or a decree or order by a court having
jurisdiction in the premises shall have been entered for the appointment of a
receiver, custodian, liquidator, assignee, trustee, sequestrator (or similar
official) of the Warrant Agent or of its property or affairs, or any public
officer shall take charge or control of the Warrant Agent or of its property or
affairs for the purpose of rehabilitation, conservation, winding up or
liquidation, a successor Warrant Agent, qualified as aforesaid, shall be
appointed by the Company by an instrument in writing, filed with the successor
Warrant Agent. Upon the appointment as aforesaid of a successor Warrant Agent
and acceptance by the successor Warrant Agent of such appointment, the Warrant
Agent shall cease to be Warrant Agent hereunder.

 

(d) Any successor Warrant Agent appointed
hereunder shall execute, acknowledge and deliver to its predecessor and to the
Company an instrument accepting such appointment hereunder, and thereupon such
successor Warrant Agent, without any further act, deed or conveyance, shall
become vested with all the authority, rights, powers, trusts, immunities,
duties and obligations of such predecessor with like effect as if originally
named as Warrant Agent hereunder, and such predecessor, upon payment of its
charges and disbursements then unpaid, shall thereupon become obligated to
transfer, deliver and pay over, and such successor Warrant Agent shall be
entitled to receive, all monies, securities and other property on deposit with
or held by such predecessor, as Warrant Agent hereunder.

 

(e) Any corporation into which the Warrant
Agent hereunder may be merged or converted or any corporation with which the
Warrant Agent may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which the Warrant Agent shall be a
party, or any corporation to which the Warrant Agent shall sell or otherwise
transfer all or substantially all the assets and business of the Warrant Agent,
provided that it shall be qualified as aforesaid, shall be the successor
Warrant Agent under this Agreement without the execution or filing of any paper
or any further act on the part of any of the parties hereto.

 

ARTICLE
6

 

MISCELLANEOUS

 

6.1
Amendment. This
Agreement may be amended by the parties hereto, without the consent of the
holder of any Warrant Certificate, for the purpose of curing any ambiguity, or
of curing, correcting or supplementing any defective provision contained
herein, or making any other provisions with respect to matters or questions
arising under this Agreement as the Company and the Warrant Agent may deem
necessary or desirable; provided that such action shall not materially
adversely affect the interests of the holders of the Warrant Certificates.

 

 

6.2
Notices and Demands to the Company and Warrant Agent. If the Warrant Agent shall receive any
notice or demand addressed to the Company by the holder of a Warrant
Certificate pursuant to the provisions of the Warrant Certificates, the Warrant
Agent shall promptly forward such notice or demand to the Company.

 

6.3
Addresses. Any
communication from the Company to the Warrant Agent with respect to this Agreement
shall be addressed to                      
, Attention:                       and any communication from the Warrant Agent
to the Company with respect to this Agreement shall be addressed to AMAG
Pharmaceuticals, Inc., 100 Hayden Avenue, Lexington, Massachusetts 02421,
Attention: Chief Financial Officer (or such other address as shall be specified
in writing by the Warrant Agent or by the Company).

 

6.4
Governing Law.
This Agreement and each Warrant Certificate issued hereunder shall be governed
by and construed in accordance with the laws of the State of New York.

 

6.5
Delivery Of Prospectus. The Company shall furnish to the Warrant Agent sufficient copies of a
prospectus meeting the requirements of the Securities Act of 1933, as amended,
relating to the Warrant Debt Securities deliverable upon exercise of the
Warrants (the “Prospectus”), and the Warrant Agent agrees that upon the
exercise of any Warrant, the Warrant Agent will deliver to the holder of the
Warrant Certificate evidencing such Warrant, prior to or concurrently with the
delivery of the Warrant Debt Securities issued upon such exercise, a
Prospectus. The Warrant Agent shall not, by reason of any such delivery, assume
any responsibility for the accuracy or adequacy of such Prospectus.

 

6.6
Obtaining of Governmental Approvals. The Company will from time to time take all action
which may be necessary to obtain and keep effective any and all permits,
consents and approvals of governmental agencies and authorities and securities
act filings under United States Federal and state laws (including without
limitation a registration statement in respect of the Warrants and Warrant Debt
Securities under the Securities Act of 1933, as amended), which may be or
become requisite in connection with the issuance, sale, transfer, and delivery
of the Warrant Debt Securities issued upon exercise of the Warrants, the
issuance, sale, transfer and delivery of the Warrants or upon the expiration of
the period during which the Warrants are exercisable.

 

6.7
Persons Having Rights Under Warrant Agreement. Nothing in this Agreement shall give to any person
other than the Company, the Warrant Agent and the holders of the Warrant
Certificates any right, remedy or claim under or by reason of this Agreement.

 

6.8
Headings. The
descriptive headings of the several Articles and Sections of this Agreement are
inserted for convenience only and shall not control or affect the meaning or
construction of any of the provisions hereof.

 

6.9
Counterparts.
This Agreement may be executed in any number of counterparts, each of which as
so executed shall be deemed to be an original, but such counterparts shall
together constitute but one and the same instrument.

 

6.10
Inspection of Agreement. A copy of this Agreement shall be available at all reasonable times at
the principal corporate trust office of the Warrant Agent for inspection by the
holder of any Warrant Certificate. The Warrant Agent may require such holder to
submit his Warrant Certificate for inspection by it.

 

 

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

 

	
   

  	
  AMAG PHARMACEUTICALS, INC.

  
	
   

  	
   

  
	
   

  	
  By

  
	
   

  	
   

  
	
   

  	
  Its

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  WARRANT AGENT

  
	
   

  	
   

  
	
   

  	
  By

  
	
   

  	
   

  
	
   

  	
  Its

  

 

 

[SIGNATURE PAGE TO
DEBT SECURITIES WARRANT AGREEMENT]

 

 

 

EXHIBIT
A

 

FORM OF
WARRANT CERTIFICATE

[FACE
OF WARRANT CERTIFICATE]

 

	
  [[Form if Warrants
  are attached to Other Securities and are not immediately detachable.]

  	
   

  	
  [Prior
  to                    ,
  this Warrant Certificate cannot be transferred or exchanged unless attached
  to a [Title of Other Securities].]

  
	
   

  	
   

  	
   

  
	
  [Form of Legend if
  Warrants are not immediately exercisable.]

  	
   

  	
  [Prior
  to                    ,
  Warrants evidenced by this Warrant Certificate cannot be exercised.]

  

 

EXERCISABLE ONLY
IF COUNTERSIGNED BY THE WARRANT AGENT AS

PROVIDED HEREIN

 

VOID AFTER [     ] P.M.,
[CITY] TIME, ON                     ,

 

 

AMAG
PHARMACEUTICALS, INC.

WARRANT
CERTIFICATE REPRESENTING

WARRANTS
TO PURCHASE

[TITLE
OF WARRANT DEBT SECURITIES]

 

	
  No.

  	
   

  	
  Warrants

  

 

This certifies that                     
or registered assigns is the registered owner of the above indicated number of
Warrants, each Warrant entitling such owner [If Warrants are attached to Other
Securities and are not immediately detachable —, subject to the registered owner
qualifying as a “Holder” of this Warrant Certificate, as hereinafter defined)]
to purchase, at any time [after [       ] p.m.,
[City] time, on                        and] on or before [      
] p.m., [City] time, on                      
, $         principal amount of [Title of Warrant Debt
Securities] (the “Warrant Debt Securities”), of AMAG Pharmaceuticals, Inc.
(the “Company”), issued or to be issued under the Indenture (as hereinafter
defined), on the following basis: during the period from                      
, through and including                      
, each Warrant shall entitle the Holder thereof, subject to the provisions of
this Agreement, to purchase the principal amount of Warrant Debt Securities
stated in the Warrant Certificate at the warrant price (the “Warrant Price”) of
       % of the
principal amount thereof [plus accrued amortization, if any, of the original
issue discount of the Warrant Debt Securities] [plus accrued interest, if any,
from the most recent date from which interest shall have been paid on the
Warrant Debt Securities or, if no interest shall have been paid on the Warrant
Debt Securities, from the date of their original issuance]. [The original issue
discount ($         for each $1,000 principal amount of Warrant
Debt Securities) will be amortized at a 
      % annual rate, computed on a[n]
[semi-]annual basis [using a 360-day year consisting of twelve 30-day months].
The Holder may exercise the Warrants evidenced hereby by providing certain
information set forth on the back hereof and by paying in full, in lawful money
of the United States of America, [in cash or by certified check or official
bank check in New York Clearing House funds] [by bank wire transfer in
immediately available funds], the Warrant Price for each Warrant Debt Security
with respect to which this Warrant is exercised to the Warrant Agent (as
hereinafter defined) and by surrendering this Warrant Certificate, with the
purchase form on the back hereof duly executed, at the corporate trust office
of [name of Warrant Agent], or its successor as warrant agent (the “Warrant
Agent”), which is, on the date hereof, at the address specified on the reverse
hereof, and upon compliance with and subject to the conditions set forth herein
and in the Warrant Agreement (as hereinafter defined).

 

The term “Holder” as used
herein shall mean [If Warrants are attached to Other Securities and are not
immediately detachable—, prior to                      
,         (the “Detachable Date”), the registered owner
of the Company’s [title of Other Securities] to which this Warrant Certificate
was initially attached, and after such Detachable Date,] the person in whose
name at the time this Warrant Certificate shall be registered upon the books to
be maintained by the Warrant Agent for that purpose pursuant to Section 4
of the Warrant Agreement.

 

The Warrants evidenced by
this Warrant Certificate may be exercised to purchase Warrant Debt Securities
in the principal amount of $1,000 or any integral multiple thereof in
registered form. Upon any exercise of fewer than all of the Warrants evidenced
by this Warrant Certificate, there shall be issued to the Holder hereof a new
Warrant Certificate evidencing Warrants for the aggregate principal amount of
Warrant Debt Securities remaining unexercised.

 

This Warrant Certificate
is issued under and in accordance with the Warrant Agreement dated as of                     ,
      (the “Warrant Agreement”), between the Company
and the Warrant Agent and is subject to the terms and provisions contained in
the Warrant Agreement, to all of which terms and provisions the Holder of this
Warrant Certificate consents by acceptance hereof. Copies of the Warrant
Agreement are on file at the above-mentioned office of the Warrant Agent.

 

The Warrant Debt Securities
to be issued and delivered upon the exercise of Warrants evidenced by this
Warrant Certificate will be issued under and in accordance with an Indenture,
[dated as of 
                    
,         (the “Senior Indenture”), between the Company
and                      
, as trustee (such trustee, and any successors to such trustee, the “Senior
Trustee”)] [dated as of 
                    
,                      
, (the “Subordinated Indenture”), between the Company and
                    
, as trustee (such trustee, and any successors to such trustee, the “Subordinated
Trustee”)] and will be subject to the terms and provisions contained in the
Warrant Debt Securities and in the Indenture. Copies of the [Senior]
[Subordinated] Indenture, including the form of the Warrant Debt Securities,
are on file at the corporate trust office of the Trustee.

 

[If Warrants are attached
to Other Securities and are not immediately detachable—Prior to the Detachable
Date, this Warrant Certificate may be exchanged or transferred only together
with the [Title of Other Securities] (the “Other Securities”) to which this
Warrant Certificate was initially attached, and only for the purpose of
effecting or in conjunction with, an exchange or transfer of such Other
Security. Additionally, on or prior to the Detachable Date, each transfer of
such Other Security on the register of the Other

 

 

Securities shall operate
also to transfer this Warrant Certificate. After such date, transfer of this]
[If Warrants are attached to Other Securities and are immediately
detachable—Transfer of this] Warrant Certificate may be registered when this
Warrant Certificate is surrendered at the corporate trust office of the Warrant
Agent by the registered owner or such owner’s assigns, in the manner and
subject to the limitations provided in the Warrant Agreement.

 

[If Other Securities with
Warrants which are not immediately detachable-Except as provided in the
immediately preceding paragraph, after] [If Other Securities with Warrants
which are immediately detachable or Warrants alone—After] countersignature by
the Warrant Agent and prior to the expiration of this Warrant Certificate, this
Warrant Certificate may be exchanged at the corporate trust office of the
Warrant Agent for Warrant Certificates representing Warrants for the same
aggregate principal amount of Warrant Debt Securities.

 

This Warrant Certificate
shall not entitle the Holder hereof to any of the rights of a holder of the
Warrant Debt Securities, including, without limitation, the right to receive
payments of principal of (and premium, if any) or interest, if any, on the
Warrant Debt Securities or to enforce any of the covenants of the Indenture.

 

Reference is hereby made
to the further provisions of this Warrant Certificate set forth on the reverse
hereof, which further provisions shall for all purposes have the same effect as
if set forth at this place.

 

This Warrant Certificate
shall not be valid or obligatory for any purpose until countersigned by the
Warrant Agent.

 

IN WITNESS WHEREOF, the Company has caused this Warrant to be executed in
its name and on its behalf by the facsimile signatures of its duly authorized
officers.

 

	
  Dated:

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  AMAG PHARMACEUTICALS, INC.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  By

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  Its

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  Countersigned:

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  As Warrant Agent

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  By

  	
   

  
	
   

  	
   

  	
   

  	
  Authorized
  Signature

  

 

 

[REVERSE
OF WARRANT CERTIFICATE]

 

(Instructions
for Exercise of Warrant)

 

To exercise any Warrants
evidenced hereby for Warrant Debt Securities (as hereinafter defined), the
Holder must pay, in lawful money of the United States of America, [in cash or
by certified check or official bank check in New York Clearing House funds] [by
bank wire transfer in immediately available funds], the Warrant Price in full
for Warrants exercised, to [Warrant Agent] [address of Warrant Agent], Attn:                      
, which payment must specify the name of the Holder and the number of Warrants
exercised by such Holder. In addition, the Holder must complete the information
required below and present this Warrant Certificate in person or by mail
(certified or registered mail is recommended) to the Warrant Agent at the
appropriate address set forth above. This Warrant Certificate, completed and
duly executed, must be received by the Warrant Agent within five business days
of the payment.

 

(To be executed
upon exercise of Warrants)

 

The undersigned hereby
irrevocably elects to exercise                     Warrants,
represented by this Warrant Certificate, to purchase $        principal amount of the [Title of Warrant
Debt Securities] (the “Warrant Debt Securities”) of AMAG Pharmaceuticals, Inc.
and represents that he has tendered payment for such Warrant Debt Securities,
in lawful money of the United States of America, [in cash or by certified check
or official bank check in New York Clearing House funds] [by bank wire transfer
in immediately available funds], to the order of AMAG Pharmaceuticals, Inc.,
c/o [insert name and address of Warrant Agent], in the amount of $
       in
accordance with the terms hereof. The undersigned requests that said principal
amount of Warrant Debt Securities be in fully registered form in the authorized
denominations, registered in such names and delivered all as specified in
accordance with the instructions set forth below.

 

If the number of Warrants
exercised is less than all the Warrants evidenced hereby, the undersigned
requests that a new Warrant Certificate evidencing the Warrants for the
aggregate principal amount of Warrant Debt Securities remaining unexercised be
issued and delivered to the undersigned unless otherwise specified in the
instructions below.

 

	
  Dated

  	
   

  	
  Name

  	
   

  
	
   

  	
  Please Print

  
	
   

  	
   

  
	
  Address:

  	
   

  
	
   

  	
   

  	
   

  
					

 

 

	
  (Insert Social Security
  or Other Identifying Number of Holder)

  	
   

  

 

 

	
  Signature Guaranteed

  	
   

  	
   

  
	
   

  	
  Signature

  	
   

  

 

(Signature must conform
in all respects to name of holder as specified on the face of this Warrant
Certificate and must bear a signature guarantee by a FINRA member firm).

 

This Warrant may be
exercised at the following addresses:

 

By hand at

 

By mail at

 

 

[Instructions as to form
and delivery of Warrant Debt Securities and, if applicable, Warrant
Certificates evidencing Warrants for the number of Warrant Debt Securities
remaining unexercised—complete as appropriate.]

 

 

ASSIGNMENT

 

[Form of
assignment to be executed if Warrant Holder desires to transfer Warrant]

 

FOR VALUE
RECEIVED,                     
hereby sells, assigns and transfers unto:

 

	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  (Please print name and
  address including zip code)

  	
   

  	
  Please print Social
  Security or other identifying number

  

 

the right represented by
the within Warrant to purchase $      aggregate
principal amount of [Title of Warrant Debt Securities] of AMAG Pharmaceuticals, Inc.
to which the within Warrant relates and appoints                        attorney to transfer such right on the books
of the Warrant Agent with full power of substitution in the premises.

 

	
  Dated:

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  Signature

  

 

(Signature must conform
in all respects to name of holder as specified on the face of the Warrant)

 

Signature
Guaranteed

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