Document:

Exhibit 4.2

 

FORM OF PRE-FUNDED WARRANT

 

THIS WARRANT AND THE SHARES OF COMMON
STOCK ISSUED UPON ITS

EXERCISE ARE SUBJECT TO THE RESTRICTIONS
ON

          TRANSFER
SET FORTH IN SECTION 5 OF THIS WARRANT          

 

	Warrant No. PFCS-[●]	Number of Shares: [●]
	 	(subject to adjustment)
	Date of Issuance: [●], 20201	 
	 	 
	Original Issue Date (as defined in subsection 2(a)): [●], 20202	 

 

Entasis Therapeutics Holdings Inc.

 

Common Stock Purchase Warrant

 

(Void after [●], [2025])3

 

Entasis Therapeutics Holdings Inc., a Delaware
corporation (the “Company”), for value received, hereby certifies that [●], or its registered assigns
(the “Registered Holder”), is entitled, subject to the terms and conditions set forth below, to purchase from
the Company, at any time or from time to time on or after the date of issuance and on or before 5:00 p.m. (New York City time)
on [●], [2025]4 shares of Common Stock, $0.001
par value per share, of the Company (“Common Stock”), at a purchase price of $0.001 per share. The shares purchasable
upon exercise of this Warrant, and the purchase price per share, each as adjusted from time to time pursuant to the provisions
of this Warrant, are hereinafter referred to as the “Warrant Shares” and the “Purchase Price,”
respectively. This Warrant is one of the Warrants (the “Warrants”) issued pursuant to that certain Securities
Purchase Agreement, dated as of [●], 20205,
by and among the Company and each of the investors party thereto (the “Purchase Agreement”). Capitalized terms
used herein have the respective meanings ascribed thereto in the Purchase Agreement unless otherwise defined herein.

 

		1.	Exercise.

 

(a)          Exercise for Cash. Subject
to the limitations set forth in Section 1(e), the Registered Holder may elect to exercise this Warrant, in whole or in part
and at any time or from time to time, by surrendering this Warrant, with the purchase form appended hereto as Exhibit I
duly executed by or on behalf of the Registered Holder, at the principal office of the Company, or at such other office or agency
as the Company may designate, accompanied by payment in full, in lawful money of the United States, of the Purchase Price payable
in respect of the number of Warrant Shares purchased upon such exercise.

 

(b)          Cashless Exercise. Subject
to the limitations set forth in Section 1(e), the Registered Holder may also elect to exercise this Warrant, in whole or in
part, on a cashless basis, by surrendering this Warrant, with the purchase form appended hereto as Exhibit I duly executed
by or on behalf of the Registered Holder, at the principal office of the Company, or at such other office or agency as the Company
may designate, by canceling a portion of this Warrant in payment of the Purchase Price payable in respect of the number of Warrant
Shares purchased upon such exercise. In the event of an exercise pursuant to this subsection 1(b), the number of Warrant Shares
issued to the Registered Holder shall be determined according to the following formula:

 

 

1
To be dated the “Closing Date” under the Securities Purchase Agreement

2
To be dated the “Closing Date” under the Securities Purchase Agreement

3
To be dated five years from the “Closing Date” under the Securities Purchase Agreement

4
To be dated five years from the “Closing Date” under the Securities Purchase Agreement

5
To be dated the “Signing Date” under the Securities Purchase Agreement

 

     

     

    

 

   [(A-B)*(X)]   

(A)

 

	Where:	 
	 	 
	A =	the VWAP on the Trading Day immediately preceding the date of such election;
	 	 
	B =	the Purchase Price then in effect; and
	 	 
	X =	the number of Warrant Shares for which this Warrant is being exercised (which shall include both the number of Warrant Shares issued to the Registered Holder and the number of Warrant Shares subject to the portion of the Warrant being cancelled in payment of the Purchase Price).

 

The “VWAP” means, for any date, the price
determined by the first of the following clauses that applies: (i) if the Common Stock is then listed on the Nasdaq Global
Select Market, the Nasdaq Global Market, the Nasdaq Capital Market or the New York Stock Exchange (such market, the “Trading
Market”), the daily volume-weighted average price of the Common Stock for such date (or the nearest preceding date) on
the Trading Market as reported by Bloomberg Financial L.P. (based on a “Trading Day” from 9:30 a.m. Eastern
Time to 4:02 p.m. Eastern Time); (ii) the volume-weighted average price of the Common Stock for such date (or the nearest
preceding date) on the OTC Bulletin Board; (iii) if the Common Stock is not then listed on a Trading Market or quoted on the
OTC Bulletin Board and if prices for the Common Stock are then reported in the “Pink Sheets” published by the Pink
Sheets, LLC (or a similar organization or agency succeeding to its functions of reporting prices), the most recent bid price per
share of the Common Stock so reported; or (iv) in all other cases, the fair market value of a share of Common Stock as determined
by a good faith determination of the Company’s Board of Directors.

 

(c)          Exercise Date. Each exercise
of this Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this Warrant
shall have been surrendered to the Company as provided in subsection 1(a) or 1(b) above (the “Exercise Date”).
At such time, the person or persons in whose name or names any certificates for Warrant Shares shall be issuable upon such exercise
as provided in subsection 1(d) below shall be deemed to have become the holder or holders of record of the Warrant Shares
represented by such certificates.

 

(d)          Issuance Upon Exercise. As
soon as practicable after the exercise of this Warrant in whole or in part, and in any event within five (5) days thereafter,
the Company, at its expense, will cause to be issued in the name of, and delivered to, the Registered Holder, or as the Registered
Holder (upon payment by the Registered Holder of any applicable transfer taxes) may direct:

 

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(i)          a certificate or certificates
for the number of full Warrant Shares to which the Registered Holder shall be entitled upon such exercise transmitted by the transfer
agent of the Company to the Registered Holder in electronic book entry form to the account of such Registered Holder or, upon request
of the Registered Holder, by physical delivery to the address specified by the Registered Holder, plus, in lieu of any fractional
share to which the Registered Holder would otherwise be entitled, cash in an amount determined pursuant to Section 3 hereof;
and

 

(ii)         in case such exercise is in part
only, a new warrant or warrants (dated the date hereof) of like tenor, calling in the aggregate on the face or faces thereof for
the number of Warrant Shares equal (without giving effect to any adjustment therein) to the number of such shares called for on
the face of this Warrant minus the number of Warrant Shares for which this Warrant was so exercised (which, in the case of an exercise
pursuant to subsection 1(b), shall include both the number of Warrant Shares issued to the Registered Holder pursuant to such partial
exercise and the number of Warrant Shares subject to the portion of the Warrant being cancelled in payment of the Purchase Price).

 

(e)          [Limitations on Exercise.
Subject to the last sentence of this Section 1(e), the Company shall not effect the exercise of this Warrant, and the Registered
Holder shall not have the right to exercise this Warrant, to the extent that after giving effect to such exercise, such Registered
Holder (together with such Registered Holder’s Affiliates and any other Persons acting as a group together) would beneficially
own in excess of [9.999]%6 (the “Maximum
Percentage”) of the shares of Common Stock outstanding immediately after giving effect to such exercise. For purposes
of the foregoing sentence, the aggregate number of shares of Common Stock beneficially owned by such Person and its Affiliates
shall include the number of shares of Common Stock issuable upon exercise of this Warrant with respect to which the determination
of such sentence is being made, but shall exclude shares of Common Stock which would be issuable upon (i) exercise of the
remaining, unexercised portion of this Warrant beneficially owned by such Person and its Affiliates and (ii) exercise or conversion
of the unexercised or unconverted portion of any other securities of the Company beneficially owned by such Person and its Affiliates
(including, without limitation, any convertible notes or convertible preferred stock or warrants) subject to a limitation on conversion
or exercise analogous to the limitation contained herein. For purposes of this Warrant, in determining the number of outstanding
shares of Common Stock, the Registered Holder may rely on the number of outstanding shares of Common Stock as reflected in (1) the
Company’s most recent Form 10-K, Proxy Statement, Form 10-Q, Current Report on Form 8-K or other public filing
with the Securities and Exchange Commission, as the case may be, (2) a more recent public announcement by the Company or (3) any
other notice by the Company or the Company’s transfer agent setting forth the number of shares of Common Stock outstanding.
For any reason at any time, upon the written or oral request of the Registered Holder, where such request indicates that it is
being made pursuant to this Warrant, the Company shall within one (1) Trading Day confirm orally and in writing to the Registered
Holder the number of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall
be determined after giving effect to the conversion or exercise of securities of the Company, including the Warrants, by the Registered
Holder and its Affiliates since the date as of which such number of outstanding shares of Common Stock was reported. Upon delivery
of a written notice to the Company, the Registered Holder may from time to time increase or decrease the Maximum Percentage to
any other percentage as specified in such notice; provided that in no event shall such Maximum Percentage be increased to more
than 19.99%; provided, further, that (i) any such increase in the Maximum Percentage will not be effective until
the sixty-first (61st) day after such notice is delivered to the Company and (ii) any such increase or decrease will apply
only to the Registered Holder and not to any other holder of Warrants. For purposes of clarity, the shares of Common Stock issuable
pursuant to the terms of this Warrant in excess of the Maximum Percentage shall not be deemed to be beneficially owned by the Registered
Holder for any purpose including for purposes of Section 13(d) or Rule 16a-1(a)(1) of the 1934 Act. No prior
inability to exercise this Warrant pursuant to this paragraph shall have any effect on the applicability of the provisions of this
paragraph with respect to any subsequent determination of exercisability. The provisions of this paragraph shall be construed and
implemented in a manner otherwise than in strict conformity with the terms of this Section 1(e) to the extent necessary
to correct this paragraph or any portion of this paragraph which may be defective or inconsistent with the intended beneficial
ownership limitation contained in this Section 1(e) or to make changes or supplements necessary or desirable to properly
give effect to such limitation. The limitations set forth in this Section 1(e) shall not apply to exercises of this Warrant
that occur prior to and expressly in connection with the Company’s consummation of a Fundamental Transaction.]

 

 

6
Insert Maximum Percentage as indicated on the Buyer’s signature page attached to the Securities Purchase Agreement.
Not applicable to Innoviva, Inc.

 

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(f)          [Notwithstanding anything to the
contrary contained herein[, including Section 1(e),] and subject to the last sentence of this Section 1[(f)], the Company
shall not effect any exercise of this Warrant, and the Registered Holder shall not be entitled to exercise this Warrant for a number
of Warrant Shares in excess of that number of Warrant Shares which, upon giving effect to such exercise, would cause (i) the
aggregate number of shares of Common Stock beneficially owned by the Registered Holder and its Affiliates and any other Persons
whose beneficial ownership of Common Stock would be aggregated with the Registered Holder’s for purposes of Section 13(d) of
the 1934 Act and the rules and regulations promulgated thereunder, including any “group” of which the Registered
Holder is a member, to exceed 19.99% of the total number of issued and outstanding shares of Common Stock of the Company following
such exercise, or (ii) the combined voting power of the securities of the Company beneficially owned by the Registered Holder
and its Affiliates and any other Persons whose beneficial ownership of Common Stock would be aggregated with the Registered Holder’s
for purposes of Section 13(d) of the 1934 Act to exceed 19.99% of the combined voting power of all of the securities
of the Company then outstanding following such exercise. For purposes of this Section 1[(f)], the aggregate number of shares
of Common Stock or voting securities beneficially owned by the Registered Holder and its Affiliates and any other Persons whose
beneficial ownership of Common Stock would be aggregated with the Registered Holder’s for purposes of Section 13(d) of
the 1934 Act shall include the shares of Common Stock issuable upon the exercise of this Warrant with respect to which such determination
is being made, but shall exclude the number of shares of Common Stock which would be issuable upon (x) exercise of the remaining
unexercised and non-cancelled portion of this Warrant by the Registered Holder and (y) exercise or conversion of the unexercised,
non-converted or non-cancelled portion of any other securities of the Company that do not have voting power (including without
limitation any securities of the Company which would entitle the holder thereof to acquire at any time Common Stock, including
without limitation any debt, preferred stock, right, option, warrant or other instrument that is at any time convertible into or
exercisable or exchangeable for, or otherwise entitles the holder thereof to receive, Common Stock), is subject to a limitation
on conversion or exercise analogous to the limitation contained herein and is beneficially owned by the Registered Holder or any
of its Affiliates and other Persons whose beneficial ownership of Common Stock would be aggregated with the Registered Holder’s
for purposes of Section 13(d) of the 1934 Act. The limitations set forth in this Section 1[(f)] shall not apply
to exercises of this Warrant that occur prior to and expressly in connection with the Company’s consummation of a Fundamental
Transaction.]7

 

 

7
To be added only for investors which would otherwise acquire more than 19.99%. Not applicable to Innoviva, Inc.

 

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		2.	Adjustments.

 

(a)          Adjustment for Stock Splits and
Combinations. If the Company shall at any time or from time to time after the date on which this Warrant was first issued (or,
if this Warrant was issued upon partial exercise of, or in replacement of, another warrant of like tenor, then the date on which
such original warrant was first issued) (either such date being referred to as the “Original Issue Date”) effect
a subdivision of the outstanding Common Stock, the Purchase Price then in effect immediately before that subdivision shall be proportionately
decreased. If the Company shall at any time or from time to time after the Original Issue Date combine the outstanding shares of
Common Stock, the Purchase Price then in effect immediately before the combination shall be proportionately increased. Any adjustment
under this paragraph shall become effective at the close of business on the date the subdivision or combination becomes effective.

 

(b)          Adjustment for Certain Dividends
and Distributions. In the event the Company at any time, or from time to time after the Original Issue Date shall make or issue,
or fix a record date for the determination of holders of Common Stock entitled to receive, a dividend or other distribution payable
in additional shares of Common Stock, then and in each such event the Purchase Price then in effect immediately before such event
shall be decreased as of the time of such issuance or, in the event such a record date shall have been fixed, as of the close of
business on such record date, by multiplying the Purchase Price then in effect by a fraction:

 

(1)          the numerator of which shall be
the total number of shares of Common Stock issued and outstanding immediately prior to the time of such issuance or the close of
business on such record date, and

 

(2)          the denominator of which shall be
the total number of shares of Common Stock issued and outstanding immediately prior to the time of such issuance or the close of
business on such record date plus the number of shares of Common Stock issuable in payment of such dividend or distribution;

 

provided, however, that if such record date shall
have been fixed and such dividend is not fully paid or if such distribution is not fully made on the date fixed therefor, the Purchase
Price shall be recomputed accordingly as of the close of business on such record date and thereafter the Purchase Price shall be
adjusted pursuant to this paragraph as of the time of actual payment of such dividends or distributions.

 

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(c)          Adjustment in Number of Warrant
Shares. When any adjustment is required to be made in the Purchase Price pursuant to subsections 2(a) or 2(b), the
number of Warrant Shares purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an
amount equal to the number of shares issuable upon the exercise of this Warrant immediately prior to such adjustment, multiplied
by the Purchase Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after
such adjustment.

 

(d)          Other Dividends and Distributions.
In the event the Company at any time or from time to time after the Original Issue Date shall make or issue, or fix a record date
for the determination of holders of Common Stock entitled to receive, a dividend or other distribution payable in securities of
the Company (other than shares of Common Stock) or in cash or other property (other than regular cash dividends paid out of earnings
or earned surplus, determined in accordance with generally accepted accounting principles), then and in each such event provision
shall be made so that the Registered Holder shall receive the kind and amount of securities of the Company, cash or other property
which the Registered Holder would have been entitled to receive had this Warrant been exercised on the date of such event (or immediately
prior to the applicable record date therefor) and had the Registered Holder thereafter, during the period from the date of such
event to and including the Exercise Date, retained any such securities receivable during such period, giving application to all
adjustments called for during such period under this Section 2 with respect to the rights of the Registered Holder.

 

(e)          Adjustment for Reorganization.
If there shall occur any reorganization, recapitalization, reclassification, consolidation, merger or similar transaction involving
the Company in which the Common Stock is converted into or exchanged for securities, cash or other property (other than a transaction
covered by subsections 2(a), 2(b) or 2(d)) (collectively, a “Reorganization”), then, following such
Reorganization, the Registered Holder shall receive upon exercise hereof the kind and amount of securities, cash or other property
which the Registered Holder would have been entitled to receive pursuant to such Reorganization if such exercise had taken place
immediately prior to such Reorganization. In any such case, appropriate adjustment (as determined in good faith by the Board) shall
be made in the application of the provisions set forth herein with respect to the rights and interests thereafter of the Registered
Holder, to the end that the provisions set forth in this Section 2 (including provisions with respect to changes in and other
adjustments of the Purchase Price) shall thereafter be applicable, as nearly as reasonably may be, in relation to any securities,
cash or other property thereafter deliverable upon the exercise of this Warrant.

 

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(f)          Fundamental
Transactions. If the Company shall enter into or be party to a Fundamental Transaction (as defined below) and (i) if
the successor entity is a publicly traded corporation whose common stock is quoted on or listed for trading on an Eligible Market
(as defined below), the successor entity shall assume in writing all of the obligations
of the Company under this Warrant pursuant to written agreements in customary form, including agreements to deliver to each Registered
Holder of Warrants in exchange for such Warrants a written instrument issued by the successor entity substantially similar in form
and substance to this Warrant and exercisable for a corresponding number of shares of capital stock equivalent to the shares of
Common Stock acquirable and receivable upon exercise of this Warrant (without regard to any limitations on the exercise of this
Warrant) on or prior to the date of such Fundamental Transaction and (ii) if the successor entity is not a publicly traded
corporation whose common stock is quoted on or listed for trading on an Eligible Market, the successor entity shall assume in writing
all of the obligations of the Company under this Warrant pursuant to written agreements in customary form, including agreements
to deliver to each holder of Warrants in exchange for such Warrants a written instrument issued by the successor entity substantially
similar in form and substance to this Warrant exercisable for the consideration that would have been issuable in the Fundamental
Transaction in respect of the Warrant Shares had this Warrant been exercised immediately prior to the consummation of the Fundamental
Transaction. The provisions of this Section 2(f) shall apply similarly and equally to successive Fundamental Transactions
and shall be applied without regard to any limitations on the exercise of this Warrant. Notwithstanding the foregoing, in the event
of a Fundamental Transaction other than pursuant to clause (i) above, then, at the request of the Registered Holder delivered
before the 15th day after such Fundamental Transaction, the Company (or the successor entity) shall purchase this Warrant and all
other outstanding Warrants held by such Registered Holder by paying to such Registered Holder, within ten (10) business days
after such request (or, if later, on the effective date of the Fundamental Transaction), cash in an amount equal to the Black Scholes
Value (as defined below) of the remaining unexercised portion of each Warrant, as
applicable, on the date of such Fundamental Transaction. For the sake of clarity, such calculation shall assume full exercisability
of this Warrant.

 

“Black
Scholes Value” means the value of this Warrant based on the Black and Scholes Option Pricing Model obtained from the
“OV” function on Bloomberg determined as of the day immediately following the public announcement of the applicable
Fundamental Transaction and reflecting (i) a risk-free interest rate corresponding to the U.S. Treasury rate for a period
equal to the remaining term of this Warrant as of such date of request and (ii) an expected volatility equal to 70%.

 

“Eligible
Market” means any of the Nasdaq Global Select Market, the Nasdaq Global Market, the Nasdaq Capital Market or the
New York Stock Exchange (or any successors to any of the foregoing).

 

“Fundamental
Transaction” means that (A) the Company shall, directly or indirectly, in one or more related transactions, (i) consolidate
or merge with or into (whether or not the Company is the surviving corporation) another Person, or (ii) sell, assign, transfer,
convey or otherwise dispose of all or substantially all of the properties or assets of the Company to another Person, or (iii) allow
another Person to make a purchase, tender or exchange offer that is accepted by the holders of more than 50% of the outstanding
shares of Common Stock (not including any shares of Common Stock held by the Person or Persons making or party to, or associated
or affiliated with the Persons making or party to, such purchase, tender or exchange offer), or (iv) consummate a stock purchase
agreement or other business combination (including, without limitation, a reorganization, recapitalization, spin-off or
scheme of arrangement) with another Person whereby such other Person acquires more than 50% of the outstanding shares of Common
Stock (not including any shares of Common Stock held by the other Person or other Persons making or party to, or associated or
affiliated with the other Persons making or party to, such stock purchase agreement or other business combination) or (B) any
“person” or “group” (as these terms are used for purposes of Sections 13(d) and 14(d) of the
1934 Act) is or shall become the “beneficial owner” (as defined in Rule 13d-3 under
the 1934 Act), directly or indirectly, of more than 50% of the aggregate ordinary
voting power represented by issued and outstanding Common Stock.

 

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“Person” means an individual, a
limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity
and a government or any department or agency thereof.

 

(g)          Certificate as to Adjustments.
Upon the occurrence of each adjustment or readjustment of the Purchase Price pursuant to this Section 2, the Company at its
expense shall, as promptly as reasonably practicable but in any event not later than ten (10) days thereafter, compute such
adjustment or readjustment in accordance with the terms hereof and furnish to the Registered Holder a certificate setting forth
such adjustment or readjustment (including the kind and amount of securities, cash or other property for which this Warrant shall
be exercisable and the Purchase Price). The Company shall, as promptly as reasonably practicable after the written request at any
time of the Registered Holder (but in any event not later than ten (10) days thereafter), furnish or cause to be furnished
to the Registered Holder a certificate setting forth (i) the Purchase Price then in effect and (ii) the number of shares
of Common Stock and the amount, if any, of other securities, cash or property which then would be received upon the exercise of
this Warrant.

 

(h)          Calculations. All calculations
under this Section 2 shall be made to the nearest cent or the nearest 1/100th of a share, as the case may be.

 

3.            Fractional Shares. The Company
shall not be required upon the exercise of this Warrant to issue any fractional shares, but shall pay the value thereof to the
Registered Holder in cash on the basis of the VWAP used in connection with the calculation set forth in subsection 1(b) above
upon the applicable exercise.

 

		4.	Representations.

 

(a) The initial Registered
Holder represents and warrants to the Company as follows:

 

(i)          Investment. The Registered
Holder is acquiring the Warrant, and (if and when the Registered Holder exercises this Warrant) the Registered Holder will acquire
the Warrant Shares, for the Registered Holder’s own account for investment and not with a view to, or for sale in connection
with, any distribution thereof, nor with any present intention of distributing or selling the same; and the Registered Holder has
no present or contemplated agreement, undertaking, arrangement, obligation, indebtedness or commitment providing for the disposition
thereof.

 

(ii)         Accredited Investor. The
Registered Holder is an “accredited investor” as defined in Rule 501(a) under the 1933 Act.

 

(iii)        Experience. The Registered
Holder has made such inquiry concerning the Company and its business and personnel as the Registered Holder has deemed appropriate;
and the Registered Holder has sufficient knowledge and experience in finance and business that the Registered Holder is capable
of evaluating the risks and merits of the Registered Holder’s investment in the Company.

 

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(b) The Company represents
and warrants to the Registered Holder as follows:

 

		(a)	The shares of Common Stock which may be issued upon the exercise of the Warrants represented by this Warrant will, upon issuance
and payment therefor of the amount at which such shares of Common Stock may at the time be purchased pursuant to the provisions
hereof (including pursuant to a cashless exercise), be validly issued, fully paid and non-assessable and in each case, be free
and clear of any liens;

 

		(b)	The Company shall use its commercially reasonable efforts to maintain a listing of its Common Stock on the Nasdaq Global Market
or other Eligible Market, provided that nothing contained in this clause (c) shall be construed to limit (or to limit) the
right of the Company to engage in a transaction that may result in it ceasing to be so listed;

 

		(c)	The Company has taken and will take all such actions as may be reasonably necessary and as are within its power to ensure that
all those shares of Common Stock and Warrants issued or issuable pursuant to this Warrant may be so issued without violation of
applicable securities laws; and

 

		(d)	The Company will promptly advise the Registered Holder of any defaults under this Warrant.

 

		5.	Transfers, etc.

 

(a)          This Warrant and the Warrant Shares
shall not be sold or transferred unless either (i) they first shall have been registered under the Act, or (ii) the Company
first shall have been furnished with an opinion of legal counsel, reasonably satisfactory to the Company, to the effect that such
sale or transfer is exempt from the registration requirements of the Act.

 

(b)          The Registered Holder acknowledges
and agrees that the Warrant Shares shall be subject to the restrictive legend requirements set forth in the Purchase Agreement.

 

(c)          The Company will maintain a register
containing the name and address of the Registered Holder of this Warrant. The Registered Holder may change the Registered Holder’s
address as shown on the warrant register by written notice to the Company requesting such change.

 

(d)          Subject to the provisions of Section 5
hereof, this Warrant and all rights hereunder are transferable, in whole or in part, upon surrender of this Warrant with a properly
executed assignment (in the form of Exhibit II hereto) at the principal office of the Company (or, if another office
or agency has been designated by the Company for such purpose, then at such other office or agency).

 

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		6.	Notices of Record Date, etc. In the event:

 

(a)          the Company shall take a record
of the holders of its Common Stock (or other stock or securities at the time deliverable upon the exercise of this Warrant) for
the purpose of entitling or enabling them to receive any dividend or other distribution, or to receive any right to subscribe for
or purchase any shares of stock of any class or any other securities, or to receive any other right; or

 

(b)          of any capital reorganization of
the Company, any reclassification of the Common Stock of the Company, any consolidation or merger of the Company with or into another
corporation (other than a consolidation or merger in which the Company is the surviving entity and its Common Stock is not converted
into or exchanged for any other securities or property), or any transfer of all or substantially all of the assets of the Company;
or

 

(c)          of the voluntary or involuntary
dissolution, liquidation or winding-up of the Company,

 

then, and in each such case, the Company will send or cause
to be sent to the Registered Holder a notice specifying, as the case may be, (i) the record date for such dividend, distribution
or right, and the amount and character of such dividend, distribution or right, or (ii) the effective date on which such reorganization,
reclassification, consolidation, merger, transfer, dissolution, liquidation or winding-up is to take place, and the time, if any
is to be fixed, as of which the holders of record of Common Stock (or such other stock or securities at the time deliverable upon
the exercise of this Warrant) shall be entitled to exchange their shares of Common Stock (or such other stock or securities) for
securities or other property deliverable upon such reorganization, reclassification, consolidation, merger, transfer, dissolution,
liquidation or winding-up. Such notice shall be sent at least five (5) days prior to the record date or effective date for
the event specified in such notice, and the Registered Holder shall keep any such notice confidential.

 

7.            Reservation of Stock. The Company
will at all times reserve and keep available, solely for issuance and delivery upon the exercise of this Warrant, such number of
Warrant Shares and other securities, cash and/or property, as from time to time shall be issuable upon the exercise of this Warrant.
[Such reservation shall comply without regard to the provisions of [Section 1(e)] [and] [Section 1(f)].]

 

		8.	Exchange or Replacement of Warrants.

 

(a)          Upon the surrender by the Registered
Holder, properly endorsed, to the Company at the principal office of the Company, the Company will, subject to the provisions of
Section 5 hereof, issue and deliver to or upon the order of the Registered Holder, at the Company’s expense, a new Warrant
or Warrants of like tenor, in the name of the Registered Holder or as the Registered Holder (upon payment by the Registered Holder
of any applicable transfer taxes) may direct, calling in the aggregate on the face or faces thereof for the number of shares of
Common Stock (or other securities, cash and/or property) then issuable upon exercise of this Warrant.

 

(b)          Upon receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of this Warrant and (in the case of loss, theft or destruction)
upon delivery of an indemnity agreement (with surety if reasonably required) in an amount reasonably satisfactory to the Company,
or (in the case of mutilation) upon surrender and cancellation of this Warrant, the Company will issue, in lieu thereof, a new
Warrant of like tenor.

 

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9.            Notices. All notices and other
communications from the Company to the Registered Holder in connection herewith shall be mailed by certified or registered mail,
postage prepaid, or sent via a reputable nationwide overnight courier service guaranteeing next business day delivery, to the address
last furnished to the Company in writing by the Registered Holder. All notices and other communications from the Registered Holder
to the Company in connection herewith shall be mailed by certified or registered mail, postage prepaid, or sent via a reputable
nationwide overnight courier service guaranteeing next business day delivery, to the Company at its principal office set forth
below. If the Company should at any time change the location of its principal office to a place other than as set forth below,
it shall give prompt written notice to the Registered Holder and thereafter all references in this Warrant to the location of its
principal office at the particular time shall be as so specified in such notice. All such notices and communications shall be deemed
delivered (i) two (2) business days after being sent by certified or registered mail, return receipt requested, postage
prepaid, or (ii) one (1) business day after being sent via a reputable nationwide overnight courier service guaranteeing
next business day delivery.

 

10.          No
Rights as Stockholder. Until the exercise of this Warrant, the Registered Holder shall not have or exercise any rights by virtue
hereof as a stockholder of the Company. Notwithstanding the foregoing, in the event (i) the Company effects a split of the
Common Stock by means of a stock dividend and the Purchase Price of and the number of Warrant Shares are adjusted as of the date
of the distribution of the dividend (rather than as of the record date for such dividend), and (ii) the Registered Holder
exercises this Warrant between the record date and the distribution date for such stock dividend, the Registered Holder shall be
entitled to receive, on the distribution date, the stock dividend with respect to the shares of Common Stock acquired upon such
exercise, notwithstanding the fact that such shares were not outstanding as of the close of business on the record date for such
stock dividend.

 

		11.	General.

 

(a) Amendment or Waiver. Any term
of this Warrant may be amended or waived only by an instrument in writing signed by the party against which enforcement of the
change or waiver is sought. No waivers of any term, condition or provision of this Warrant, in any one or more instances, shall
be deemed to be, or construed as, a further or continuing waiver of any such term, condition or provision.

 

(b) Section Headings. The
section headings in this Warrant are for the convenience of the parties and in no way alter, modify, amend, limit or restrict the
contractual obligations of the parties.

 

(c) Governing Law; Trial by Jury.
This Warrant shall be governed by, and construed in accordance with, the internal laws of the State of New York without regard
to the choice of law principles thereof that would result in the application of the laws of any other jurisdiction. The Company
and the Holder each hereby irrevocably agree to the exclusive jurisdiction of the courts of the State of New York located in New
York County and the United States District Court for the Southern District of New York for the purposes of any action or legal
proceeding arising out of this Warrant and the rights and obligations arising hereunder, and irrevocably and unconditionally waives
any objection to the laying of venue of any such action or legal proceeding in any such court, and further irrevocably and unconditionally
waives and agrees not to plead or claim in any such court that any such action or legal proceeding has been brought in an inconvenient
forum. Each party hereto hereby waives, to the fullest extent permitted by applicable Law,
any right it may have to a trial by jury in respect of any action or legal proceeding directly or indirectly arising out of, under
or in connection with this Warrant.

 

    - 11 -

     

    

 

(d) Successors and Assigns. This
Warrant Certificate and all of its provisions shall inure to the benefit of the Registered Holder, and its heirs, executors, administrators,
successors, legal representatives and assigns and shall be binding upon the Company and its successors and permitted assigns.

 

(e) Counterparts. This Warrant
may be executed in counterparts, each of which shall be deemed an original, but all of which together shall be deemed to be one
and the same agreement. A signed copy of this Warrant delivered by facsimile, e-mail or other means of electronic transmission
shall be deemed to have the same legal effect as delivery of an original signed copy of this Warrant.

 

(f) Specific Performance. The
parties hereto acknowledge and agree that irreparable damage would occur in the event that any of the provisions of this Warrant
were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties
hereto shall be entitled to an injunction or injunctions to prevent breaches or threatened breaches of this Warrant and to enforce
specifically the terms and provisions of this Warrant in any court of competent jurisdiction, in each case without proof of damages
or otherwise (and each party hereto hereby waives any requirement for the securing or posting of any bond in connection with such
remedy), this being in addition to any other remedy to which they are entitled at law or in equity. The parties hereto agree not
to assert that a remedy of specific enforcement is unenforceable, invalid, contrary to law or inequitable for any reason, nor to
assert that a remedy of monetary damages would provide an adequate remedy.

 

(g) Severability. If any one or
more of the provisions or parts thereof contained in this Warrant Certificate should be or become invalid, illegal or unenforceable
in any respect in any jurisdiction, the remaining provisions or parts thereof contained herein shall be and shall be conclusively
deemed to be, as to such jurisdiction, severable therefrom and:

 

(i) the validity, legality or enforceability
of such remaining provisions or parts thereof shall not in any way be affected or impaired by the severance of the provisions or
parts thereof severed;

 

(ii) the invalidity, illegality or
unenforceability of any provision or part thereof contained in this Warrant in any jurisdiction shall not affect or impair such
provision or part thereof or any other provisions of this Warrant Certificate in any other jurisdiction; and

 

(iii) the Company and the Holder shall
negotiate in good faith to modify this Warrant Certificate so as to effect the original intent of the Company and the Holder as
closely as possible in a mutually acceptable manner in order that the transactions contemplated hereby be consummated and the economic
benefits anticipated hereunder be as originally contemplated to the greatest extent possible.

 

[remainder of page intentionally left
blank]

 

    - 12 -

     

    

 

EXECUTED as of the Date of Issuance indicated
above.

 

 

	 	ENTASIS THERAPEUTICS HOLDINGS INC.
	 	 
	 	 
	 	By:	                            
	 	 
	 	Name:	 
	 	 
	 	Title:	 

 

    - 13 -

     

    

 

EXHIBIT I

 

PURCHASE FORM

 

	To:_________________	Dated:____________

 

The undersigned, pursuant to the provisions
set forth in the attached Warrant (No. ___), hereby elects to purchase (check applicable box):

 

 ̈          ____
shares of the Common Stock of Entasis Therapeutics Holdings Inc. covered by such Warrant; or

 

 ̈          the
maximum number of shares of Common Stock covered by such Warrant pursuant to the cashless exercise procedure set forth in subsection 1(b).

 

The undersigned herewith makes payment of
the full purchase price for such shares at the price per share provided for in such Warrant. Such payment takes the form of (check
applicable box or boxes):

 

		 ̈	$______ in lawful money of the United States; and/or

 

		 ̈	the cancellation of such number of Warrant Shares as is necessary, in accordance with the formula
set forth in subsection 1(b), to exercise this Warrant with respect to the maximum number of Warrant Shares purchasable pursuant
to the cashless exercise procedure set forth in subsection 1(b).

 

	 	Signature:  	 
	 	 	 
	 	Address:	 
	 	 	 
	 	 	 

 

    - 14 -

     

    

 

EXHIBIT II

 

ASSIGNMENT FORM

 

FOR VALUE RECEIVED, ________________________________________
hereby sells, assigns and transfers all of the rights of the undersigned under the attached Warrant (No. ____) with respect
to the number of shares of Common Stock of Entasis Therapeutics Holdings Inc. covered thereby set forth below, unto:

 

	Name of Assignee	Address	No. of Shares
	 	 	 
	 	 	 
	 	 	 
	 	 	 

 

	Dated:	 	 	Signature:	
	 	 	 	 
	Signature Guaranteed:	 	 	 
	 	 	 	 
	By:	       	 	 	 

 

    - 15 -Exhibit 10.1

 

Execution Version

 

THE SYMBOL “[***]” DENOTES
PLACES WHERE CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH (i) NOT MATERIAL, AND
(ii) WOULD LIKELY CAUSE COMPETITIVE HARM TO THE COMPANY IF PUBLICLY DISCLOSED

 

SECURITIES PURCHASE AGREEMENT

 

This SECURITIES PURCHASE AGREEMENT (this
“Agreement”) is made and entered into as of August 27, 2020 by and among Entasis Therapeutics Holdings
Inc., a Delaware corporation (the “Company”), and the Investors identified on Exhibit A attached
hereto (each an “Investor” and collectively the “Investors”).

 

Recitals

 

A.          The
Company and each Investor is executing and delivering this Agreement in reliance upon the exemption from securities registration
afforded by Section 4(a)(2) of the Securities Act of 1933, as amended (the “1933 Act”), and/or Rule 506
of Regulation D (“Regulation D”) as promulgated by the United States Securities and Exchange Commission (the
“SEC”) under the 1933 Act;

 

B.          The
Investors (on a several and not a joint basis) wish to purchase from the Company, and the Company wishes to sell and issue to the
Investors, upon the terms and subject to the conditions stated in this Agreement, (i) shares (the “Shares”)
of the Company’s Common Stock, par value $0.001 per share (the “Common Stock”), (ii) warrants to
purchase shares of Common Stock in the form attached hereto as Exhibit B-1 (each, a “Common Warrant”
and collectively, the “Common Warrants”) and (iii) in lieu of Shares, pre-funded warrants to purchase shares
of Common Stock in the form attached hereto as Exhibit B-2 (each, a “Pre-Funded Common Warrant”
and collectively, the “Pre-Funded Common Warrants” and, together with the Common Warrants, the “Warrants”);
and

 

C.          Contemporaneously
with the sale of the Shares and Warrants, the parties hereto will execute and deliver a Registration Rights Agreement, in the form
attached hereto as Exhibit C (the “Registration Rights Agreement”), pursuant to which the Company
will agree to provide certain registration rights in respect of the Shares and Common Warrant Shares (as defined below) under the
1933 Act, and the rules and regulations promulgated thereunder, and applicable state securities laws.

 

In consideration of the mutual promises
made herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties
hereto agree as follows:

 

1.          Definitions.
For the purposes of this Agreement, the following terms shall have the meanings set forth below:

 

“Affiliate” means, with
respect to any Person, any other Person which directly or indirectly through one or more intermediaries Controls, is controlled
by, or is under common Control with, such Person; provided, that for purposes of this Agreement, neither Purchaser nor any
of their respective Affiliates shall be deemed to be an Affiliate of the Company or any of its Subsidiaries.

 

     

     

    

 

“Business Day” means
a day, other than a Saturday or Sunday, on which banks in New York City are open for the general transaction of business.

 

“Closing” has the meaning
set forth in Section 3.1.

 

“Closing Date” has the
meaning set forth in Section 3.1.

 

“Closing Securities”
means the Shares and the Warrants.

 

“Common Warrants” has
the meaning set forth in the Recitals.

 

“Common Warrant Shares”
means the Shares of Common Stock Issuable upon exercise of the Common Warrants.

 

“Company’s Knowledge”
means the actual knowledge of the executive officers (as defined in Rule 405 under the 1933 Act) of the Company.

 

“Control” (including
the terms “controlling”, “controlled by” or “under common control with”) means the possession,
direct or indirect, of the power to direct or cause the direction of the management and policies of a Person, whether through the
ownership of voting securities, by contract or otherwise.

 

“Disclosure Schedules”
has the meaning set forth in Section 4.

 

“Environmental Laws”
has the meaning set forth in Section 4.16.

 

“FDA” has the meaning
set forth in Section 4.27.

 

“GAAP” has the meaning
set forth in Section 4.18.

 

“Intellectual Property”
means all patents, patent applications, trademarks, trademark applications, service marks, trade names, copyrights, trade secrets,
licenses, domain names, information and proprietary rights and processes.

 

“Investor Questionnaire”
has the meaning set forth in Section 3.1.

 

“Material Adverse Effect”
means a material adverse effect on (i) the assets, liabilities, results of operations, financial condition or business of
the Company and its Subsidiaries taken as a whole, (ii) the legality or enforceability of any of the Transaction Documents
or (iii) the ability of the Company to perform its obligations under the Transaction Documents.

 

“Material Contract” means
any contract, instrument or other agreement to which the Company is a party or by which it is bound which is material to the business
of the Company, including those that have been filed as an exhibit to the SEC Filings pursuant to Item 601(b)(10) of Regulation
S-K.

 

    	 	2	 

     

    

 

“Nasdaq” means The Nasdaq
Global Market.

 

“Person” means an individual,
corporation, partnership, limited liability company, trust, business trust, association, joint stock company, joint venture, sole
proprietorship, unincorporated organization, governmental authority or any other form of entity not specifically listed herein.

 

“Placement Agents” means
Cantor Fitzgerald & Co. and A.G.P. / Alliance Global Partner.

 

“Pre-Funded Common Warrants”
has the meaning set forth in the Recitals.

 

“Pre-Funded Common Warrant Shares”
means the shares of Common Stock issuable upon exercise of the Pre-Funded Common Warrants.

 

“Press Release” has the
meaning set forth in Section 9.7.

 

“Registration Rights Agreement”
has the meaning set forth in the Recitals.

 

“Rule 144” has the
meaning set forth in Section 7.5.

 

“SEC Filings” has the
meaning set forth in Section 4.

 

“Securities” means the
Shares, the Warrants and the Warrant Shares.

 

“Selling Stockholder Questionnaire”
has the meaning set forth in Section 3.1.

 

“Shares” has the meaning
set forth in the Recitals.

 

“Short Sales” means all
“short sales” as defined in Rule 200 of Regulation SHO under the 1934 Act (but shall not be deemed to include
the location and/or reservation of borrowable shares of Common Stock).

 

“Subscription Amount”
means, as to an Investor, the aggregate amount to be paid for the Closing Securities purchased hereunder as specified opposite
such Investor’s name on Exhibit A attached hereto, under the column entitled “Aggregate Purchase Price
of Closing Securities,” in U.S. Dollars and in immediately available funds.

 

“Subsidiaries” has the
meaning set forth in Section 4.1.

 

“Trading Day” means a
day on which Nasdaq is open for trading.

 

“Transfer Agent” has
the meaning set forth in Section 7.5.

 

“Transaction Documents”
means this Agreement, the Warrants and the Registration Rights Agreement.

 

“Warrants” has the meaning
set forth in the Recitals.

 

    	 	3	 

     

    

 

“Warrant Shares” means
the shares of Common Stock issuable upon exercise of the Warrants.

 

“1933 Act” has the meaning
set forth in the Recitals.

 

“1934 Act” means the
Securities Exchange Act of 1934, as amended, or any successor statute, and the rules and regulations promulgated thereunder.

 

2.          Purchase
and Sale of the Shares and Warrants. On the Closing Date, upon the terms and subject to the conditions set forth herein, the
Company will issue and sell, and the Investors will purchase, severally and not jointly, (i) the number of Shares set forth
opposite the name of such Investor under the heading “Number of Shares to be Purchased” on Exhibit A attached
hereto, at a price per Share equal to $2.675, (ii) the number of Common Warrants set forth opposite the name of such Investor
under the heading “Number of Common Warrants to be Purchased” on Exhibit A attached hereto, each with an
exercise price equal to $2.675 per Common Warrant Share (subject to adjustment as provided therein) and (iii) in lieu of Shares,
the number of Pre-Funded Common Warrants set forth opposite the name of such Investor under the heading “Number of Pre-Funded
Common Warrants to be Purchased” on Exhibit A attached hereto, each with an exercise price of $0.001 per Pre-Funded
Common Warrant Share (subject to adjustment as provided herein) and at a purchase price of $2.675 per Pre-Funded Common Warrant.

 

		3.	Closing.

 

3.1.          The
closing of the purchase and sale of the Closing Securities (which Closing Securities are set forth in the Schedule of Investors)
pursuant to this Agreement (the “Closing”) shall be held on the second Business Day after satisfaction or waiver
of the conditions set forth in Section 6.1 and Section 6.2 (other than those conditions that by their terms are to be
satisfied at the Closing, but subject to the satisfaction or waiver of those conditions) via the remote electronic exchange of
documents and signatures, or on such other date and place as may be agreed to by the Company and the Investors (the “Closing
Date”). At or prior to the Closing, each Investor and the Company shall execute any related agreements or other documents
required to be executed hereunder, dated on or before the Closing Date, including, with respect to any Investor who has not already
executed such form, the Investor Questionnaire and the Selling Stockholder Notice and Questionnaire in the forms attached hereto
as Appendix I and Appendix II (the “Investor Questionnaire” and the “Selling Stockholder
Questionnaire,” respectively).

 

3.2.          On
the Closing Date, each Investor shall deliver or cause to be delivered to the Company the Subscription Amount via wire transfer
(less any amounts owed to such Investor pursuant to Section 9.5) of immediately available funds pursuant to the wire instructions
delivered to such Investor by the Company at least two (2) Business Days prior to the Closing Date.

 

3.3.          At
or before the Closing, the Company shall deliver or cause to be delivered to each Investor (i) the number of Shares, registered
in the name of the Investor in book entry form (or, at an Investor’s request, reflected by a physical stock certificate),
in the amount set forth opposite the name of such Investor under the heading “Number of Shares to be Purchased” on
Exhibit A attached hereto, (ii) the number of Common Warrants set forth opposite the name of such Investor under
the heading “Number of Common Warrants to be Purchased” on Exhibit A attached hereto, registered in the
name of the Investor and (iii) the number of Pre-Funded Common Warrants set forth opposite the name of such Investor under
the heading “Number of Pre-Funded Common Warrants to be Purchase” on Exhibit A attached hereto, registered
in the name of such Investor.

 

    	 	4	 

     

    

 

4.          Representations
and Warranties of the Company. The Company hereby represents and warrants to the Investors that, except as set forth in the
schedules delivered herewith (collectively, the “Disclosure Schedules”), if any, and except as otherwise described
in the Company’s filings pursuant to the 1934 Act made prior to the date hereof (collectively, the “SEC Filings”)
(but excluding any forward-looking disclosures set forth in any “risk factors” section, any disclosures in any “forward-looking
statements” section and any other disclosures included therein to the extent they are predictive or forward-looking in nature),
which qualify these representations and warranties in their entirety, as of the date hereof:

 

4.1.          Organization,
Good Standing and Qualification. The Company is an entity duly incorporated, validly existing and in good standing under the
laws of the State of Delaware, with the requisite corporate power and authority to own or lease and use its properties and assets,
to execute and deliver the Transaction Documents, to carry out the provisions of the Transaction Documents, to issue and sell the
Closing Securities and to carry on its business as presently conducted and as proposed to be conducted as described in the SEC
Filings. Each of the Company’s Subsidiaries required to be disclosed pursuant to Item 601(b)(21) of Regulation S-K in
an exhibit to its annual report on Form 10-K filed with the SEC for the year ended December 31, 2019 (the “Subsidiaries”)
is an entity duly incorporated or otherwise organized, validly existing and in good standing (to the extent such concept exists
in the relevant jurisdiction) under the laws of the jurisdiction of its incorporation or organization, as applicable, and has all
requisite power and authority to carry on its business to own and use its properties. Neither the Company nor any of its Subsidiaries
is in violation or default of any of the provisions of its respective articles of association, charter, certificate of incorporation,
bylaws, limited partnership agreement or other organizational or constitutive documents. Each of the Company and its Subsidiaries
is duly qualified to do business as a foreign entity and is in good standing (to the extent such concept exists in the relevant
jurisdiction) in each jurisdiction in which the conduct of its business or its ownership or leasing of property makes such qualification
necessary, except to the extent any failure to so qualify has not had and would not reasonably be expected to have, individually
or in the aggregate, a Material Adverse Effect.

 

4.2.          Authorization.
The Company has the requisite corporate power and authority and has taken all requisite corporate action necessary for, and no
further action on the part of the Company, its officers, directors and stockholders is necessary for, (i) the authorization,
execution and delivery of the Transaction Documents, (ii) the authorization of the performance of all obligations of the Company
hereunder or thereunder, and (iii) the authorization, issuance (or reservation for issuance) and delivery of the Closing Securities.
The Company’s execution and delivery of each of the Transaction Documents and the consummation by it of the transactions
contemplated hereby and thereby have been duly and validly authorized by all necessary board and stockholder action. Each of the
Transaction Documents has been duly executed and delivered by the Company and, assuming due authorization, execution and delivery
by the Investors, constitutes valid and binding obligations of the Company enforceable in accordance with their terms, except (a) as
limited by applicable bankruptcy, insolvency, reorganization, moratorium or other laws of general application affecting enforcement
of creditors’ rights, (b) general principles of equity that restrict the availability of equitable remedies and (c) to
the extent that the enforceability of indemnification provisions may be limited by applicable laws.

 

    	 	5	 

     

    

 

4.3.          Capitalization.
Schedule 4.3 sets forth as of the date hereof (i) the authorized capital stock of the Company; (ii) the number
of shares of capital stock issued and outstanding; (iii) the number of shares of capital stock issuable pursuant to the Company’s
stock plans; and (iv) the number of shares of capital stock issuable and reserved for issuance pursuant to securities (other
than the Closing Securities, Warrant Shares and any other shares of Common Stock being issued by the Company pursuant to this Agreement)
exercisable for, or convertible into or exchangeable for any shares of capital stock of the Company. All of the issued and outstanding
shares of the Company’s capital stock have been duly authorized and validly issued and are fully paid, nonassessable and
none of such shares were issued in violation of any pre-emptive rights and such shares were issued in compliance in all material
respects with applicable state and federal securities law and any rights of third parties. Except as described on Schedule 4.3,
no Person is entitled to pre-emptive or similar statutory or contractual rights with respect to the issuance by the Company of
any securities of the Company. Except as described on Schedule 4.3, there are no outstanding warrants, options, convertible
securities or other rights, agreements or arrangements of any character under which the Company is or may be obligated to issue
any equity securities of any kind and except as contemplated by this Agreement. Except as described on Schedule 4.3
and except for the Registration Rights Agreement, there are no voting agreements, buy-sell agreements, option or right of first
purchase agreements or other agreements of any kind among the Company and any of the security holders of the Company relating to
the securities of the Company held by them. Except as described on Schedule 4.3 and except as provided in the Registration
Rights Agreement, no Person has the right to require the Company to register any securities of the Company under the 1933 Act,
whether on a demand basis or in connection with the registration of securities of the Company for its own account or for the account
of any other Person. The issuance and sale of the Closing Securities hereunder will not obligate the Company to issue shares of
Common Stock or other securities to any other Person (other than the Investors) and will not result in the adjustment of the exercise,
conversion, exchange or reset price of any outstanding security.

 

4.4.          Valid
Issuance. The Shares have been duly and validly authorized and, when issued and paid for pursuant to this Agreement, will be
validly issued, fully paid and nonassessable, and shall be free and clear of all encumbrances and restrictions (other than those
waived or created by the Investors), except for restrictions on transfer set forth in the Transaction Documents or imposed by applicable
securities laws. The Warrants have been duly and validly authorized and, when issued and paid for pursuant to this Agreement, will
be validly issued. The Warrant Shares have been duly and validly authorized and reserved for issuance and, upon exercise of the
Warrants in accordance with their terms, including the payment of any exercise price therefor, will be validly issued, fully paid
and nonassessable and will be free and clear of all encumbrances and restrictions (other than those created by the Investors),
except for restrictions on transfer set forth in the Transaction Documents or imposed by applicable securities laws. Assuming the
accuracy of the representations and warranties of the Investors in this Agreement, the Closing Securities will be issued in compliance
with all applicable federal and state securities laws.

 

    	 	6	 

     

    

 

4.5.          Consents.
The execution, delivery and performance by the Company of the Transaction Documents and the offer, issuance and sale of the Closing
Securities require no consent of, action by or in respect of, or filing with, any Person, governmental body, agency, or official
other than filings that have been made pursuant to applicable state securities laws and post-sale filings pursuant to applicable
state and federal securities laws and the rules and regulations of the Nasdaq Stock Market (“Nasdaq”),
which the Company shall file within the applicable time periods, and other than the registration statement required to be filed
by the Registration Rights Agreement, except as have already been made, obtained or waived or where the failure to obtain any such
approval, authorization, consent, order or filing would not impair the ability of the Company to issue and sell the Shares or to
consummate the transactions contemplated by this Agreement.

 

4.6.          Delivery
of SEC Filings. True and complete copies of the SEC Filings have been made available by the Company to the Investors through
the Electronic Data Gathering, Analysis, and Retrieval system (the “EDGAR System”) (other than any information
for which the Company has received confidential treatment from the SEC).

 

4.7.          No
Material Adverse Change. Since June 30, 2020, except as specifically set forth in a subsequent SEC Filing, there has not
been:

 

(i)          any change in the assets, liabilities,
financial condition or operating results of the Company from that reflected in the financial statements included in the Company’s
Quarterly Report on Form 10-Q for the three months ended June 30, 2020, except for changes in the ordinary course of
business which have not had and would not reasonably be expected, individually or in the aggregate, to have a Material Adverse
Effect;

 

(ii)         any declaration or payment by
the Company of any dividend, or any authorization or payment by the Company of any distribution, on any of the capital stock of
the Company, or any redemption or repurchase by the Company of any securities of the Company;

 

(iii)        any material damage, destruction
or loss, whether or not covered by insurance, to any assets or properties of the Company;

 

(iv)        any waiver, not in the ordinary
course of business, by the Company of a material right or of a material debt owed to it;

 

(v)         any satisfaction or discharge
of a material lien, claim or encumbrance or payment of any obligation by the Company, except in the ordinary course of business;

 

(vi)        any change or amendment to the
Company’s Amended and Restated Certificate of Incorporation or Amended and Restated Bylaws, or termination of or material
amendment to any contract of the Company that the Company is required to file with the SEC pursuant to Item 601(b)(10) of
Regulation S-K;

 

    	 	7	 

     

    

 

(vii)       any material labor difficulties
or, to the Company’s Knowledge, labor union organizing activities with respect to employees of the Company;

 

(viii)      any material transaction entered
into by the Company other than in the ordinary course of business;

 

(ix)         the loss of the services of any
executive officer (as defined in Rule 405 under the 1933 Act) of the Company; or

 

(x)          any other event or condition that,
to the Company’s Knowledge, individually or in the aggregate, has had or would reasonably be expected to have a Material
Adverse Effect.

 

4.8.          SEC Filings. The Company has filed
all reports, schedules, forms, statements and other documents required to be filed by the Company under 1933 Act and the 1934 Act,
including pursuant to Section 13(a) or 15(d) thereof, for the one year preceding the date hereof (or such shorter
period as the Company was required by law or regulation to file such material). At the time of filing thereof, such SEC Filings
complied as to form in all material respects with the requirements of the 1933 Act or 1934 Act, as applicable, and, as of their
respective dates, did not contain any untrue statement of a material fact or omit to state any material fact required to be stated
therein or necessary in order to make the statements made therein, in the light of the circumstances under which they were made,
not misleading.

 

4.9.          No Conflict, Breach, Violation or
Default. The execution, delivery and performance of the Transaction Documents by the Company and the issuance and sale of the
Closing Securities in accordance with the provisions thereof will not (i) conflict with or result in a breach or violation
of (a) any of the terms and provisions of, or constitute a default under, the Company’s Amended and Restated Certificate
of Incorporation or Amended and Restated Bylaws, both as in effect on the date hereof (true and complete copies of which have been
made available to the Investors through the EDGAR system), or (b) assuming the accuracy of the representations and warranties
in Section 5, any applicable statute, rule, regulation or order of any governmental agency or body or any court, domestic
or foreign, having jurisdiction over the Company or its Subsidiaries, or any of their assets or properties, or (ii) conflict
with, or constitute a default (or an event that with notice or lapse of time or both would become a default) under, result in the
creation of any lien, encumbrance or other adverse claim upon any of the properties or assets of the Company or its Subsidiaries
or give to others any rights of termination, amendment, acceleration or cancellation (with or without notice, lapse of time or
both) of, any contract or agreement to which the Company is a party, except, in the case of clauses (i)(b) and (ii) only,
for such conflicts, breaches, violations and defaults as have not and would not reasonably be expected to have, individually or
in the aggregate, a Material Adverse Effect.

 

4.10.        Compliance.  The Company
is not (i) in default under or in violation of (and no event has occurred that has not been waived that, with notice or lapse
of time or both, would result in a default by the Company under), nor has the Company received notice of a claim that it is in
default under or that it is in violation of, any indenture, loan or credit agreement or any other agreement or instrument to which
it is a party or by which it or any of its properties is bound (whether or not such default or violation has been waived), (ii) in
violation of any judgment, decree or order of any court, arbitrator or governmental body or (iii) in violation of any statute,
rule, ordinance or regulation of any governmental authority, including without limitation all foreign, federal, state and local
laws relating to taxes, environmental protection, occupational health and safety, product quality and safety and employment and
labor matters, except in each case as would not have or reasonably be expected to result in, individually or in the aggregate,
a Material Adverse Effect.

 

    	 	8	 

     

    

 

4.11.        Tax Matters. The Company and
its Subsidiaries have filed all material tax returns (subject to permitted exceptions) required to have been filed by the Company
or its Subsidiaries with all appropriate governmental agencies and have paid all material taxes shown thereon or otherwise owed
by them, other than those being contested in good faith and for which adequate reserves have been provided. The Company has made
adequate charges, accruals and reserves in the applicable financial statements referred to in Section 4.18 below in respect
of all federal, state and foreign income and franchise taxes for all periods as to which the tax liability of the Company or its
Subsidiaries has not been finally determined, except to the extent of any inadequacy that would not, individually or in the aggregate,
reasonably be expected to result in a Material Adverse Effect. There are no material tax liens or claims pending or, to the Company’s
Knowledge, threatened against the Company or any of its Subsidiaries or any of their respective assets or property.

 

4.12.        Title to Properties. The Company
and its Subsidiaries have good and marketable title to all real properties and all other tangible properties and assets owned by
them, in each case free from liens, encumbrances and defects, except such as would not reasonably be expected, individually or
in the aggregate, to have a Material Adverse Effect; and the Company and its Subsidiaries hold any leased real or personal property
under valid, subsisting and enforceable leases with which the Company and its Subsidiaries are in compliance and with no exceptions,
except such as would not reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect and except
that the enforcement thereof may be subject to (i) bankruptcy, insolvency, reorganization, receivership, moratorium, fraudulent
convenience or other similar laws relating to creditor’s rights generally and (ii) general principles of equity and
the discretion of the court before which any proceeding therefor may be brought.

 

4.13.        Certificates, Authorities and Permits.
The Company and its Subsidiaries possess adequate certificates, authorities or permits issued by appropriate governmental agencies
or bodies necessary to conduct the business now operated by them, except where failure to so possess would not reasonably be expected
to, individually or in the aggregate, result in a Material Adverse Effect. The Company and its Subsidiaries have not received any
notice of proceedings relating to the revocation or modification of any such certificate, authority or permit that, if determined
adversely to the Company or its Subsidiaries, would reasonably be expected, individually or in the aggregate, to have a Material
Adverse Effect.

 

    	 	9	 

     

    

 

4.14.        Labor Matters.

 

(a)          Neither the Company nor its Subsidiaries
are parties to or bound by any collective bargaining agreements or other agreements with labor organizations.

 

(b)          No labor dispute before the National
Labor Relations Board with the employees of the Company or any of its Subsidiaries, or with the employees of any principal supplier,
manufacturer, customer or contractor of the Company, exists or, to the Company’s Knowledge, is threatened or imminent that
would reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect.

 

(c)          There are no claims pending against
the Company before the Equal Employment Opportunity Commission or any other administrative body or in any court asserting any violation
of Title VII of the Civil Rights Act of 1964, the Age Discrimination Act of 1967, 42 U.S.C. §§ 1981 or 1983 or any other
federal, state or local law, statute or ordinance barring discrimination of employment that would reasonably be expected, individually
or in the aggregate, to have a Material Adverse Effect.

 

4.15.        Intellectual Property. The Company
and its Subsidiaries own, possess, license or have other rights to use, the patents and patent applications, copyrights, trademarks,
service marks, trade names, service names and trade secrets as necessary or material for use in connection with its businesses
as described in the SEC Filings (collectively, the “Intellectual Property Rights”), and to the Company’s
Knowledge, there are no material liens, security interests or encumbrances that have been filed against any of these Intellectual
Property Rights. No actions, suits, proceedings or claims are pending, or to the Company’s Knowledge, asserted or threatened
against the Company or its Subsidiaries alleging infringement of a patent or other intellectual property right of others. To the
Company’s Knowledge, there is no existing infringement by another Person of any of the Intellectual Property Rights that
would materially affect the use thereof by the Company. To the Company’s Knowledge,
the Company is not liable for infringement with respect to any of the Company’s product candidates. To the Company’s
Knowledge, the development, manufacture, sale, and any currently proposed use of any of the products, proposed products or processes
of the Company referred to in the SEC Reports, in the current or proposed conduct of the business of the Company, do not currently,
and will not upon commercialization, to the Company’s Knowledge, infringe any right or valid patent claim of any third party.
To the Company’s Knowledge, there are no ownership rights of third parties to any Intellectual Property Rights in any field
of use that is exclusively licensed to the Company, other than any licensor to the Company of such Intellectual Property Rights.
To the Company’s Knowledge, no action, suit, claim or other proceeding, except for
routine patent and trademark prosecution proceedings in patent offices throughout the world, is pending or threatened challenging
the validity, enforceability, scope, registration, ownership or use of any of the Intellectual Property Rights. To the Company’s
Knowledge, no action, suit, claim or other proceeding is pending or threatened, challenging the Company’s rights in or to
any Intellectual Property Rights.  The Company and its Subsidiaries have security procedures to protect the secrecy,
confidentiality and value of their Intellectual Property Rights. To the Company’s Knowledge,
no employee is in or has been in violation in any material respect of any term of any employment contract, invention assignment
agreement, non-competition agreement,  or nondisclosure agreement with a former employer, executed prior to such
employee’s employment where the basis of such violation relates to such employee’s employment and such violation occurred
while employed and while the contract was valid and in effect. All material licenses or other material agreements under
which the Company is granted rights to Intellectual Property are, to the Company’s Knowledge, in full force and effect and,
to the Company’s Knowledge, there is no material default by any other party thereto. To the Company’s Knowledge, the
licensors under material licenses and other material agreements had all requisite power and authority to grant the rights to the
Intellectual Property purported to be granted thereby. To the Company’s Knowledge, the consummation of the transactions contemplated
hereby and by the other Transaction Documents will not result in the alteration, loss, impairment of or restriction on the Company’s
or any of its Subsidiaries’ ownership or right to use any Intellectual Property that is material to the conduct of the Company’s
business as now conducted.

 

    	 	10	 

     

    

 

4.16.        Environmental Matters. Except
as would not reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect, neither the Company nor
any of its Subsidiaries is in violation of any statute, rule, regulation, decision or order of any governmental agency or body
or any court, domestic or foreign, relating to the use, disposal or release of hazardous or toxic substances or relating to the
protection or restoration of the environment or human exposure to hazardous or toxic substances (collectively, “Environmental
Laws”), has released any hazardous substances regulated by Environmental Law on to any real property that it owns or
operates, or has received any written notice or claim that it is liable for any off-site disposal or contamination pursuant to
any Environmental Laws; and to the Company’s Knowledge, there is no pending or threatened investigation that would reasonably
be expected to lead to such a claim.

 

4.17.        Legal Proceedings. There are
no legal, governmental or regulatory investigations, actions, suits or proceedings, to the Company’s Knowledge, pending to
which the Company or any of its Subsidiaries is or may reasonably be expected to become a party or to which any property of the
Company is or may reasonably be expected to become the subject that, individually or in the aggregate, if determined adversely
to the Company or its Subsidiaries, would reasonably be expected to have a Material Adverse Effect. Neither the Company nor any
of its Subsidiaries, nor, to the Company’s Knowledge, any director or officer thereof (in their respective capacities as
such), is or has been the subject of any action involving a judicially filed claim of violation of or liability under federal or
state securities laws or a judicially filed claim of breach of fiduciary duty. There has not been, and to the Company’s Knowledge,
there is not pending, any investigation by the SEC involving the Company or any current or former director or officer of the Company
(in their respective capacities as such). The SEC has not issued any stop order or other order suspending the effectiveness of
any registration statement filed by the Company or any of its Subsidiaries under the 1933 Act or the 1934 Act.

 

4.18.        Financial Statements. The financial
statements included in each SEC Filing comply in all material respects with applicable accounting requirements and the rules and
regulations of the SEC with respect thereto as in effect at the time of filing (or to the extent corrected by a subsequent restatement)
and present fairly, in all material respects, the financial position of the Company as of the dates shown and its results of operations
and cash flows for the periods shown, subject in the case of unaudited financial statements to normal, immaterial year-end audit
adjustments, and such financial statements have been prepared in conformity with United States generally accepted accounting principles
applied on a consistent basis during the periods involved (“GAAP”) (except as may be disclosed therein or in
the notes thereto, and except that the unaudited financial statements may not contain all footnotes required by GAAP, and, in the
case of quarterly financial statements, as permitted by Form 10-Q under the 1934 Act).

 

    	 	11	 

     

    

 

4.19.        Insurance Coverage. The Company
and each of the Subsidiaries maintain insurance covering their respective properties, operations, personnel and businesses as the
Company reasonably deems adequate; the Company reasonably believes such insurance insures against such losses and risks in accordance
with customary industry practice to protect the Company and the Subsidiaries and their respective businesses and which is commercially
reasonable for the current conduct of their respective businesses; to the Company’s Knowledge, all such insurance is fully
in force on the date hereof.

 

4.20.        Compliance with Nasdaq Continued
Listing Requirements. The Company is in compliance with applicable Nasdaq continued listing requirements. There are no proceedings
pending or, to the Company’s Knowledge, threatened against the Company relating to the continued listing of the Common Stock
on Nasdaq and the Company has not received any notice of, nor to the Company’s Knowledge is there any reasonable basis for,
the delisting of the Common Stock from Nasdaq.

 

4.21.        Brokers and Finders. Other than
the Placement Agents, no Person will have, as a result of the transactions contemplated by the Transaction Documents, any valid
right, interest or claim against or upon the Company or an Investor for any commission, fee or other compensation pursuant to any
agreement, arrangement or understanding entered into by or on behalf of the Company.

 

4.22.        No Directed Selling Efforts or General
Solicitation. Neither the Company nor any of its Subsidiaries nor any Person acting on their behalf has conducted any general
solicitation or general advertising (as those terms are used in Regulation D) in connection with the offer or sale of any
of the Closing Securities.

 

4.23.        No Integrated Offering. Neither
the Company nor any of its Subsidiaries nor any Person acting on their behalf has, directly or indirectly, made any offers or sales
of any Company security or solicited any offers to buy any Company security, under circumstances that would adversely affect reliance
by the Company on Section 4(a)(2) for the exemption from registration for the transactions contemplated hereby or would
require registration of the Closing Securities under the 1933 Act.

 

4.24.        Questionable Payments.
Neither the Company nor any of its Subsidiaries nor, to the Company’s Knowledge, any of the current or former directors,
officers, employees, agents or other Persons acting on behalf of the Company or its Subsidiaries, has taken any action, directly
or indirectly, that would result in a violation by such persons of the Foreign Corrupt Practices Act of 1977, as amended, and the
rules and regulations thereunder, or the OECD Convention on Bribery of Foreign Public Officials in International Business
Transactions.

 

    	 	12	 

     

    

 

4.25.        Internal Controls. The Company
has established and maintains disclosure controls and procedures (as defined in Rules 13a-15(c) and 15d-15(e) of
the 1934 Act) for the Company and designed such disclosure controls and procedures to ensure that material information relating
to the Company and required to be disclosed by the Company in the reports that it files or submits under the 1934 Act is made known
to the certifying officers by others within the Company. The Company maintains a system of internal accounting controls sufficient
to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific
authorizations, (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with
GAAP and to maintain asset and liability accountability, and (iii) access to assets or incurrence of liabilities is permitted
only in accordance with management’s general or specific authorization. The Company’s certifying officers have evaluated
the effectiveness of the Company’s controls and procedures as of the end of the period covered by the most recently filed
periodic report under the 1934 Act (such date, the “Evaluation Date”). The Company presented in its most recently
filed periodic report under the 1934 Act the conclusions of the certifying officers about the effectiveness of the disclosure controls
and procedures based on their evaluations as of the Evaluation Date. Since the end of the Company’s most recent audited fiscal
year, to the Company’s Knowledge, there have been no significant deficiencies or material weaknesses detected in the Company’s
internal control over financial reporting (whether or not remediated) and no change in the Company’s internal control over
financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control
over financial reporting. The Company is not aware of any change in its internal control over financial reporting that has occurred
during its most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Company’s
internal control over financial reporting. The Company maintains a standard system of accounting established and administered in
accordance with GAAP and the applicable requirements of the 1934 Act.

 

4.26.        Investment Company. The Company
is not required to be registered as, and immediately following the Closing will not be required to register as, an “investment
company” within the meaning of the Investment Company Act of 1940, as amended.

 

4.27.        Tests and Preclinical and Clinical
Trials. The studies, tests and preclinical and clinical trials conducted by or, to the Company’s Knowledge, on behalf
of the Company were and, if still pending, are being, conducted in all material respects in accordance with the protocols submitted
to the U.S. Food and Drug Administration (the “FDA”) or any foreign governmental body exercising comparable
authority, procedures and controls pursuant to, where applicable, good clinical practice, informed consent and all applicable laws,
regulations and requirements. The Company has filed with the FDA or other appropriate governmental entity all material required
notices, and annual or other reports, including notices of adverse experiences and reports of serious and unexpected adverse experiences,
related to the use of its product candidates in clinical trials. The descriptions of the studies, tests and preclinical and clinical
trials conducted by or, to the Company’s Knowledge, on behalf of the Company, contained in the SEC Filings are accurate and
complete in all material respects; the Company is not aware of any other studies, tests or preclinical and clinical trials, the
results of which call into question the results described in the SEC Filings; and the Company has not received any notices or correspondence
from the FDA, any foreign, state or local governmental body exercising comparable authority or any Institutional Review Board requiring
the termination, suspension, material modification or clinical hold of any studies, tests or preclinical or clinical trials conducted
by or on behalf of the Company. The properties, business and operations of the Company have been and are being conducted in all
material respects in accordance with all applicable laws, rules and regulations of the FDA and any other governmental entity. The
Company has not been informed by the FDA or any other governmental entity that the FDA or any other governmental entity will prohibit
the testing, distribution, marketing, sale, license or use of any product proposed to be developed, produced, tested, distributed
or marketed by the Company. Neither the Company nor, to the Company’s Knowledge, any of its officers or employees has committed
any act, made any statement or failed to make any statement that would reasonably be expected to provide a basis for the FDA to
invoke its policy with respect to “Fraud, Untrue Statements of Material Facts, Bribery, and Illegal Gratuities” set
forth in 56 Fed. Reg. 46191 (Sept. 10, 1991) and any amendments thereto. Neither the Company nor, to the Company’s Knowledge,
any officer or employee of the Company has been convicted of any crime or engaged in any conduct that has resulted in or would
reasonably be expected to result in (i) debarment under 21 U.S.C. Section 335a or any similar state law or (ii) exclusion
under 42 U.S.C. Section 1320a-7 or any similar state law or regulation.

 

    	 	13	 

     

    

 

4.28.        Manipulation of Price. 
The Company has not taken, and, to the Company’s Knowledge, no Person acting on its behalf has taken, directly or indirectly,
any action designed to cause or to result in the stabilization or manipulation of the price of any security of the Company to facilitate
the sale or resale of any of the Securities.

 

4.29.        Bad Actor Disqualification. None
of the Company, any predecessor or affiliated issuer of the Company nor, to the Company’s Knowledge, any director or executive
officer of the Company or any promoter connected with the Company in any capacity, is subject to any of the “bad actor”
disqualifications within the meaning of Rule 506(d) under the 1933 Act, except for a disqualification event covered by
Rule 506(d)(2) or (d)(3).

 

4.30.        Foreign Corrupt Practices. 
Neither the Company nor its Subsidiaries has, and to the Company’s Knowledge, no agent or other person acting on behalf of
the Company or its Subsidiaries has (i) directly or indirectly, used any funds for unlawful contributions, gifts, entertainment
or other unlawful expenses related to foreign or domestic political activity, (ii) made any unlawful payment to foreign or
domestic government officials or employees or to any foreign or domestic political parties or campaigns from corporate funds, (iii) failed
to disclose fully any contribution made by the Company or its Subsidiaries (or made by any person acting on behalf of the Company
or its Subsidiaries which the Company is aware) which is in violation of law, or (iv) violated in any material respect any
provision of the Foreign Corrupt Practices Act of 1977, as amended.

 

4.31.        Transactions with Affiliates. 
No transaction with the Company required to be disclosed in the SEC Filings pursuant to Item 404 of Regulation S-K exists as of
the date hereof that has not so been disclosed.

 

4.32.        Health Care Laws.  The Company
has operated and currently is in compliance in all material respects with all applicable Health Care Laws (defined herein), including,
without limitation, the rules and regulations of the FDA, the U.S. Department of Health and Human Services Office of Inspector
General, the Centers for Medicare & Medicaid Services, the Office for Civil Rights, the Department of Justice or any other
governmental agency or body having jurisdiction over the Company or any of its properties, and has not engaged in activities which
are, as applicable, cause for false claims liability, civil penalties, or mandatory or permissive exclusion from Medicare, Medicaid,
or any other state or federal health care program. For purposes of this Agreement, “Health Care Laws” shall
mean the federal Anti-kickback Statute (42 U.S.C. § 1320a-7b(b)), the Physician Payment Sunshine Act (42 U.S.C. § 1320a-7h),
the civil False Claims Act (31 U.S.C. §§ 3729 et seq.), the criminal False Claims Act (42 U.S.C. § 1320a-7b(a)),
all criminal laws relating to health care fraud and abuse, including but not limited to 18 U.S.C. Sections 286 and 287, and the
health care fraud criminal provisions under the Health Insurance Portability and Accountability Act of 1996 (42 U.S.C. § 1320d
et seq.) (“HIPAA”), the exclusion laws (42 U.S.C. § 1320a-7), the civil monetary penalties law (42 U.S.C.
§ 1320a-7a), HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act (42 U.S.C. §§
17921 et seq.), the patient privacy, data security and breach notification provisions under HIPAA, the Federal Food, Drug, and
Cosmetic Act (21 U.S.C. §§ 301 et seq.), Medicare (Title XVIII of the Social Security Act), Medicaid (Title XIX of the
Social Security Act), the regulations promulgated pursuant to such laws, and any other similar local, state or federal law and
regulations. The Company has not received any FDA Form 483, notice of adverse finding, warning letter, untitled letter or
other correspondence, communication or notice from the FDA or any other governmental or regulatory authority alleging or asserting
noncompliance with any Health Care Laws applicable to the Company. The Company is not a party to nor has any ongoing reporting
obligations pursuant to any corporate integrity agreements, deferred prosecution agreements, monitoring agreements, consent decrees,
settlement orders, plans of correction or similar agreements with or imposed by any governmental or regulatory authority. Neither
the Company nor any of its employees, officers, directors or, to the Company’s Knowledge, consultants has been excluded,
suspended or debarred from participation in any U.S. state or federal health care program or human clinical research or, to the
Company’s Knowledge, is subject to a governmental inquiry, investigation, proceeding, or other similar action that could
reasonably be expected to result in debarment, suspension, or exclusion.

 

    	 	14	 

     

    

 

4.33.        Stock Option Plans.  Each
stock option granted by the Company under the Company’s stock option plans was granted in accordance with the terms of the
applicable Company stock option plan. No stock option granted under the Company’s stock option plans has been backdated.

 

4.34.        Off Balance Sheet Arrangements. 
There is no transaction, arrangement, or other relationship between the Company and an unconsolidated or other off balance sheet
entity that would have or reasonably be expected to result in, individually or in the aggregate, a Material Adverse Effect.

 

4.35.        Acknowledgment Regarding Investors’
Purchase of Closing Securities.  The Company acknowledges and agrees that each of the Investors is acting solely in the
capacity of an arm’s length investor with respect to the Transaction Documents and the transactions contemplated hereby and
thereby. The Company further acknowledges that no Investor is acting as a financial advisor or fiduciary of the Company (or in
any similar capacity) with respect to the Transaction Documents and the transactions contemplated thereby and any advice given
by any Investor or any of their respective representatives or agents in connection with the Transaction Documents and the transactions
contemplated thereby is merely incidental to the Investors’ purchase of the Closing Securities. The Company further represents
to each Investor that the Company’s decision to enter into this Agreement and the other Transaction Documents has been based
solely on the independent evaluation of the transactions contemplated hereby by the Company and its representatives.

 

    	 	15	 

     

    

 

4.36.        Use of Form S-3.  The
Company meets the registration and transaction requirements for use of Form S-3 (including pursuant to General Instruction
I.B.6 of Form S-3, as applicable) for the registration of the Shares and the Common Warrant Shares for resale by the Investors.

 

4.37.        Takeover Protections; Rights Agreements. 
The Company and the Board of Directors of the Company have taken all necessary action, if any, in order to render inapplicable
any control share acquisition, business combination, poison pill (including any distribution under a rights agreement) or other
similar anti-takeover provision under the Company’s charter documents or the laws of its state of incorporation that is or
could reasonably be expected to become applicable to any of the Investors as a result of the Investors and the Company fulfilling
their obligations or exercising their rights under the Transaction Documents, including, without limitation, the Company’s
issuance of the Closing Securities and the Investors’ ownership of the Closing Securities.

 

4.38.        Disclosure. Except with respect
to the material terms and conditions of the transactions contemplated by the Transaction Documents, the Company confirms that neither
it nor, to the Company’s Knowledge, any other Person acting on its behalf has provided any of the Investors with any information
that it believes constitutes material, non-public information that will not otherwise be disclosed in the SEC Filings on or prior
to the Closing Date. The Company understands and confirms that the Investors will rely on the foregoing representation in effecting
transactions in securities of the Company.

 

5.          Representations
and Warranties of the Investors. Each of the Investors hereby, severally and not jointly, represents and warrants to the Company
that:

 

5.1.          Organization
and Existence. Unless such Investor is an individual, such Investor is a validly existing corporation, limited partnership
or limited liability company and has all requisite corporate, partnership or limited liability company power and authority to enter
into and consummate the transactions contemplated by the Transaction Documents and to carry out its obligations hereunder and thereunder,
and to invest in the Securities pursuant to this Agreement.

 

5.2.          Authorization.
The execution, delivery and performance by such Investor of the Transaction Documents to which such Investor is a party have been
duly authorized and each has been duly executed and when delivered will constitute the valid and legally binding obligation of
such Investor, enforceable against such Investor in accordance with their respective terms, except: (i) as limited by general
equitable principles and applicable bankruptcy, insolvency, reorganization, moratorium and other laws of general application affecting
enforcement of creditors’ rights generally, (ii) as limited by laws relating to the availability of specific performance,
injunctive relief or other equitable remedies and (iii) insofar as indemnification and contribution provisions may be limited
by applicable law.

 

5.3.          Purchase
Entirely for Own Account. The Securities to be received by such Investor hereunder will be acquired for such Investor’s
own account, not as nominee or agent, and not with a view to the resale or distribution of any part thereof in violation of the
1933 Act, and such Investor has no present intention of selling, granting any participation in, or otherwise distributing the same
in violation of the 1933 Act without prejudice, however, to such Investor’s right at all times to sell or otherwise dispose
of all or any part of such Securities in compliance with applicable federal and state securities laws. Nothing contained herein
shall be deemed a representation or warranty by any Investor to hold the Securities for any period of time. Such Investor is not
a broker-dealer registered with the SEC under the 1934 Act or an entity engaged in a business that would require it to be so registered.

 

    	 	16	 

     

    

 

5.4.          Investment
Experience. Such Investor acknowledges that it can bear the economic risk and complete loss of its investment in the Securities
and has such knowledge and experience in financial or business matters that it is capable of evaluating the merits and risks of
the investment contemplated hereby.

 

5.5.          Disclosure
of Information. Such Investor has had an opportunity to receive, review and understand all information related to the Company
requested by it and to ask questions of and receive answers from the Company regarding the Company, its business and the terms
and conditions of the offering of the Securities, and has conducted and completed its own independent due diligence. Such Investor
acknowledges receipt of copies of the SEC Filings. Based on the information such Investor has deemed appropriate, and without reliance
upon any Placement Agent, it has independently made its own analysis and decision to enter into the Transaction Documents. Such
Investor is relying exclusively on its own sources of information, investment analysis and due diligence (including professional
advice it deems appropriate) with respect to the execution, delivery and performance of the Transaction Documents, the Securities
and the business, condition (financial and otherwise), management, operations, properties and prospects of the Company, including
but not limited to all business, legal, regulatory, accounting, credit and tax matters. Neither such inquiries nor any other due
diligence investigation conducted by such Investor shall modify, limit or otherwise affect such Investor’s right to rely
on the Company’s representations and warranties contained in this Agreement.

 

5.6.          Restricted
Securities. Such Investor understands that the Securities are characterized as “restricted securities” under the
U.S. federal securities laws inasmuch as they are being acquired from the Company in a transaction not involving a public offering
and that under such laws and applicable regulations such securities may be resold without registration under the 1933 Act only
in certain limited circumstances.

 

5.7.          Legends.
It is understood that, except as provided below, certificates evidencing the Securities may bear the following or any similar legend:

 

		(i)	“The securities represented hereby have not been registered with the Securities
and Exchange Commission or the securities commission of any state in reliance upon an exemption from registration under the Securities
Act of 1933, as amended, and, accordingly, may not be transferred unless (i) such securities have been registered for sale
pursuant to the Securities Act of 1933, as amended, (ii) such securities may be sold pursuant to Rule 144 UNDER THE SECURITIES
ACT OF 1933, AS AMENDED, or (iii) the Company has received an opinion of counsel reasonably satisfactory to it that such transfer
may lawfully be made without registration under the Securities Act of 1933, as amended. These securities are subject to transfer
and other restrictions set forth in a SECURITIES Purchase Agreement, dated August 27, 2020, copies of which are on file with
the Company. NOTWITHSTANDING THE FOREGOING, THE SECURITIES MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR
OTHER LOAN OR FINANCING ARRANGEMENT SECURED BY THE SECURITIES.”

 

    	 	17	 

     

    

 

		(ii)	If required by the authorities of any state in connection with the issuance of sale of the Securities, the legend required
by such state authority.

 

5.8.          Accredited Investor. At the time
such Investor was offered the Closing Securities, it was and, as of the date hereof, such Investor is an “accredited investor”
within the meaning of Rule 501 under the 1933 Act and has executed and delivered to the Company its Investor Questionnaire,
which such Investor represents and warrants is true, correct and complete. Such Investor is a sophisticated institutional investor
with sufficient knowledge, sophistication and experience in business, including transactions involving private placements in public
equity, to properly evaluate the risks and merits of its purchase of the Securities. Such Investor has determined based on its
own independent review and such professional advice as it deems appropriate that its purchase of the Securities and participation
in the transactions contemplated by the Transaction Documents (i) have been duly authorized and approved by all necessary
action and (ii) do not and will not violate or constitute a default under such Investor’s charter, bylaws or other constituent
document, if applicable, under any law, rule, regulation, agreement or other obligation by which such Investor is bound.

 

5.9.          Placement Agents. Such Investor
hereby acknowledges and agrees that it has independently evaluated the merits of its decision to purchase the Securities, and that
(i) no disclosure or offering document has been prepared by the Placement Agents in connection with the offer and sale of
the Securities, (ii) each Placement Agent is acting solely as placement agent in connection with the execution, delivery and
performance of the Transaction Documents and is not acting as an underwriter or in any other capacity and is not and shall not
be construed as a fiduciary for such Investor, the Company or any other person or entity in connection with the execution, delivery
and performance of the Transaction Documents, (iii) the Placement Agents and each of their respective directors, officers,
employees, representatives and controlling persons have made no independent investigation with respect to the Company or the Securities
or the accuracy, completeness or adequacy of any information supplied to such Investor or by the Company, (iv) the Placement
Agents have not made and will not make any representation or warranty, whether express or implied, of any kind or character and
have not provided any advice or recommendation in connection with the execution, delivery and performance of the Transaction Documents,
and (v) the Placement Agents will not have any responsibility with respect to (a) any representations, warranties or
agreements made by any person or entity under or in connection with the execution, delivery and performance of the Transaction
Documents, or the execution, legality, validity or enforceability (with respect to any person) thereof, or (b) the business,
affairs, financial condition, operations, properties or prospects of, or any other matter concerning the Company. On behalf of
itself and its affiliates, such Investor hereby (a) acknowledges that the Placement Agents shall have no liability or obligation
to the Investors or their affiliates in respect of the Transaction Documents or the transactions contemplated thereby, (b) waives
any claims that it otherwise might assert against the Placement Agents in respect of the transactions contemplated by the Transaction
Documents, and (c) releases the Placement Agents in respect of any losses, claims, damages, obligations, penalties, judgments,
awards, liabilities, costs, expenses or disbursements related to the Transaction Documents or the transactions contemplated thereby.

 

    	 	18	 

     

    

 

5.10.         No
General Solicitation. Such Investor did not learn of the investment in the Securities as a result of any general solicitation
or general advertising.

 

5.11.         Brokers
and Finders. No Person will have, as a result of the transactions contemplated by the Transaction Documents, any valid right,
interest or claim against or upon the Company or an Investor for any commission, fee or other compensation pursuant to any agreement,
arrangement or understanding entered into by or on behalf of such Investor.

 

5.12.         Short
Sales and Confidentiality Prior to the Date Hereof.  Other than consummating the transactions contemplated hereunder,
such Investor has not, nor has any Person acting on behalf of or pursuant to any understanding with such Investor, directly or
indirectly executed any purchases or sales, including Short Sales, of the securities of the Company during the period commencing
as of the time that such Investor was first contacted by the Company, the Placement Agents or any other Person regarding the transactions
contemplated hereby and ending immediately prior to the date hereof.  Notwithstanding the foregoing, in the case of an Investor
that is a multi-managed investment vehicle whereby separate portfolio managers manage separate portions of such Investor’s
assets and the portfolio managers have no direct knowledge of the investment decisions made by the portfolio managers managing
other portions of such Investor’s assets, the representation set forth above shall only apply with respect to the portion
of assets managed by the portfolio manager that made the investment decision to purchase the Securities covered by this Agreement. 
Such Investor, its Affiliates and, to the knowledge of such Investor, authorized representatives and advisors of such Investor
who are aware of the transactions contemplated hereby, maintained the confidentiality of all disclosures made to it in connection
with this transaction (including the existence and terms of this transaction). Notwithstanding the foregoing, for avoidance of
doubt, nothing contained herein shall constitute a representation or warranty, or preclude any actions, with respect to the identification
of the availability of, or securing of, available shares to borrow in order to effect Short Sales or similar transactions in the
future.

 

5.13.         No
Government Recommendation or Approval. Such Investor understands that no United States federal or state agency, or similar
agency of any other country, has reviewed, approved, passed upon, or made any recommendation or endorsement of the Company or the
purchase of the Securities.

 

5.14.         No
Intent to Effect a Change of Control; Ownership. Such Investor has no present intent to effect a “change of control”
of the Company as such term is understood under the rules promulgated pursuant to Section 13(d) of the 1934 Act
and under the rules of Nasdaq, it being understood that by virtue of its current equity ownership as set forth in the Selling
Stockholder Questionnaire, Innoviva, Inc. may be deemed to control the Company. Except as set forth in its Selling Stockholder
Questionnaire, as of the date hereof, neither the Investor nor any of its Affiliates is the owner of record or the beneficial owner
of shares of Common Stock or securities convertible into or exchangeable for Common Stock.

 

    	 	19	 

     

    

 

5.15.         No
Conflicts. The execution, delivery and performance by such Investor of the Transaction Documents and the consummation by such
Investor of the transactions contemplated hereby and thereby will not (i) result in a violation of the organizational documents
of such Investor or (ii) conflict with, or constitute a default (or an event which with notice or lapse of time or both would
become a default) under, or give to others any rights of termination, amendment, acceleration or cancellation of, any agreement,
indenture or instrument to which such Investor is a party, or (iii) result in a violation of any law, rule, regulation, order,
judgment or decree (including federal and state securities laws) applicable to such Investor, except in the case of clauses (ii) and
(iii) above, for such conflicts, defaults, rights or violations which would not, individually or in the aggregate, reasonably
be expected to have a material adverse effect on the ability of such Investor to perform its obligations hereunder.

 

5.16.         No
Rule 506 Disqualifying Activities. Such Investor has not taken any of the actions set forth in, and is not subject to,
the disqualification provisions of Rule 506(d)(1) of the 1933 Act.

 

5.17.         Residency.
Such Investor is a resident of or an entity organized under the jurisdiction specified below its address on the Schedule of Investors.

 

5.18.         ERISA.
If Investor is (1) an employee benefit plan subject to Title I of the Employee Retirement Income Security Act of 1974, as
amended (“ERISA”), (2) a plan or account subject to Section 4975 of the Internal Revenue Code of 1986
(the “Code”) or (3) an entity deemed to hold “plan assets” of any such plan or account, Investor
hereby represents and warrants, solely for purposes of assisting the Placement Agents in relying on the exception from fiduciary
status under U.S. Department of Labor Regulations set forth in Section 29 CFR 2510.3-21(c)(1), that a fiduciary acting on
its behalf is causing the Investor to enter into this Agreement and the transactions contemplated hereby and that such fiduciary:

 

(i)              is
an entity specified in Section 29 CFR 2510.3-21(c)(1)(i)(A)-(E);

 

(ii)             is
independent (for purposes of Section 29 CFR 2510.3-21(c)(1)) of the Placement Agents;

 

(iii)            is
capable of evaluating investment risks independently, both in general and with regard to particular transactions and investment
strategies, including the Investor’s transactions hereunder;

 

(iv)            has
been advised that, with respect to the Placement Agents, neither the Placement Agents nor any of their respective Affiliates has
undertaken or will undertake to provide impartial investment advice, or has given or will give advice in a fiduciary capacity,
in connection with the Investor’s transactions contemplated hereby;

 

    	 	20	 

     

    

 

(v)            is
a “fiduciary” under Section 3(21)(a) of ERISA or Section 4975(e)(3) of the Code, or both, as applicable,
with respect to, and is responsible for exercising independent judgment in evaluating, the Investor’s transactions contemplated
hereby; and

 

(vi)          understands
and acknowledges that no fees, compensation arrangements or financial interests provided for in connection with the transactions
contemplated hereby is a fee or other compensation for the provision of investment advice, and that neither the Placement Agents
nor any of their respective Affiliates, nor any of their respective directors, officers, members, partners, employees, principals
or agents, has received or will receive a fee or other compensation from Investor or such fiduciary for the provision of investment
advice in connection with the Investor’s transactions contemplated hereby.

 

The Company acknowledges and agrees that the representations
contained in this Section 5 shall not modify, amend or affect such Investor’s right to rely on the Company’s representations
and warranties contained in this Agreement or any representations and warranties contained in any other Transaction Document or
any other document or instrument executed and/or delivered in connection with this Agreement or the consummation of the transactions
contemplated hereby.

 

6.            Conditions
to Closing.

 

6.1.            Conditions
to the Investors’ Obligations. The obligation of each Investor to purchase Closing Securities at the Closing is subject
to the fulfillment to such Investor’s satisfaction, on or prior to the Closing Date, of the following conditions, any of
which may be waived by such Investor (as to itself only):

 

(i)              The
representations and warranties made by the Company in Section 4 hereof shall be true and correct in all material respects
(except for those representations and warranties which are qualified as to materiality or by Material Adverse Effect, in which
case such representations and warranties shall be true and correct in all respects) as of the date hereof and on the Closing Date,
except to the extent any such representation or warranty expressly speaks as of an earlier date, in which case such representation
or warranty shall be true and correct as of such earlier date. The Company shall have performed in all material respects all obligations
and covenants herein required to be performed by it on or prior to the Closing Date.

 

(ii)            The
Company shall have obtained any and all consents, permits, approvals, registrations and waivers necessary for consummation of the
purchase and sale of the Closing Securities and the consummation of the other transactions contemplated by the Transaction Documents,
including the waiver of any applicable registration rights that could affect the rights of the Investors under the Registration
Rights Agreement, all of which shall be in full force and effect.

 

(iii)           The
Company shall have executed and delivered the Registration Rights Agreement.

 

(iv)          The
Company shall have filed with Nasdaq a Notification Form: Listing of Additional Shares for the listing of the Shares and the Warrant
Shares, a copy of which shall have been provided to the Investors.

 

    	 	21	 

     

    

 

(v)           No
judgment, writ, order, injunction, award or decree of or by any court, or judge, justice or magistrate, including any bankruptcy
court or judge, or any order of or by any governmental authority, shall have been issued, and no action or proceeding shall have
been instituted by any governmental authority, enjoining or preventing (or seeking to enjoin or prevent) the consummation of the
transactions contemplated hereby or in the other Transaction Documents and no law shall have been enacted or made effective that
makes illegal or otherwise prohibits the consummation of the transactions contemplated hereby.

 

(vi)          The
Investors shall have received an opinion from Covington & Burling LLP, the Company’s counsel, dated as of the Closing
Date, in a customary form reasonably acceptable to the Investors.

 

(vii)         No
stop order or suspension of trading shall have been imposed by Nasdaq, the SEC or any other governmental or regulatory body with
respect to public trading in the Common Stock.

 

(viii)        A
certificate of the Secretary of the Company (the “Secretary’s Certificate”), dated as of the Closing Date,
(a) certifying the resolutions adopted by the Board of Directors of the Company or a duly authorized committee thereof approving
the transactions contemplated by this Agreement and the other Transaction Documents and the issuance of the Closing Securities,
and (b) certifying the current versions of the Amended and Restated Certificate of Incorporation and Amended and Restated
Bylaws of the Company.

 

(ix)          A
Lock-Up Agreement, substantially in the form of Exhibit D hereto (the “Lock-Up Agreement”) executed
by each executive officer and director of the Company, and each such Lock-Up Agreement shall be in full force and effect on the
Closing Date.

 

(x)            Since
the date of this Agreement, there shall not have occurred a Material Adverse Effect.

 

6.2.           Conditions
to Obligations of the Company. The Company’s obligation to sell and issue Closing Securities at the Closing is subject
to the fulfillment to the satisfaction of the Company on or prior to the Closing Date of the following conditions, any of which
may be waived by the Company:

 

(i)            The
representations and warranties made by the Investors in Section 5 hereof shall be true and correct in all material respects
(except for those representations and warranties which are qualified as to materiality, in which case such representations and
warranties shall be true and correct in all respects) when made, and shall be true and correct in all material respects (except
for those representations and warranties which are qualified as to materiality, in which case such representations and warranties
shall be true and correct in all respects) on the Closing Date with the same force and effect as if they had been made on and as
of said date.

 

(ii)            The
Investors shall have performed in all material respects all obligations and covenants herein required to be performed by them on
or prior to the Closing Date.

 

    	 	22	 

     

    

 

(iii)           Each
Investor shall have executed and delivered the Registration Rights Agreement, and if required, an Investor Questionnaire and a
Selling Stockholder Questionnaire.

 

(iv)          Any
Investor purchasing Closing Securities at the Closing shall have paid in full its Subscription Amount to the Company.

 

6.3.          Termination
of Obligations to Effect Closing; Effects.

 

(i)            The
obligations of the Company, on the one hand, and the Investors, on the other hand, to effect the Closing shall terminate as follows:

 

(a)            Upon
the mutual written consent of the Company and an Investor (but only with respect to such Investor);

 

(b)            By
the Company if any of the conditions set forth in Section 6.2 shall have become incapable of fulfillment, and shall not have
been waived by the Company; or

 

(c)            By
an Investor (with respect to itself only) if any of the conditions set forth in Section 6.1 shall have become incapable of
fulfillment, and shall not have been waived by the Investor;

 

provided, however, that, except in the case of
clause (a) above, the party seeking to terminate its obligation to effect the Closing shall not then be in breach of any of
its representations, warranties, covenants or agreements contained in this Agreement or the other Transaction Documents if such
breach has resulted in the circumstances giving rise to such party’s seeking to terminate its obligation to effect the Closing.

 

(ii)            In
the event of a termination pursuant to this Section 6.3, written notice thereof shall be given to the other Investors by the
Company and the other Investors shall have the right to terminate their obligations to effect the Closing upon written notice to
the Company and the other Investors. Nothing in this Section 6.3 shall be deemed to release any party from any liability for
any breach by such party of the terms and provisions of this Agreement or the other Transaction Documents or to impair the right
of any party to compel specific performance by any other party of its obligations under this Agreement or the other Transaction
Documents.

 

(iii)            Upon
termination of this Agreement pursuant to this Section 6.3, this Agreement shall forthwith become void (in the case of a termination
with respect to only one Investor, only with respect to such Investor) and there shall be no further obligations or liabilities
on the part of the Company and such Investor(s); provided, that, this Section 4, Section 9.4 through Section 9.10
and Section 9.10 shall survive the termination of this Agreement; provided further that nothing set forth in this Agreement
shall relieve any party from liability for any breach of this Agreement occurring prior to such termination.

 

7.            Covenants
and Agreements of the Company.

 

7.1.            Information.
From the date hereof until the Closing, the Company will make reasonably available to the Investors’ representatives, consultants
and their respective counsels for inspection, such information and documents as the Investor reasonably requests, and will make
available at reasonable times and to a reasonable extent officers and employees of the Company to discuss the business and affairs
of the Company; provided, however, that in no event shall the Company be required to disclose material nonpublic
information to the Investors, or to advisors to or representatives of the Investors.

 

    	 	23	 

     

    

 

7.2.            Nasdaq
Listing. The Company will use commercially reasonable efforts to continue the listing and trading of its Common Stock on Nasdaq
and, in accordance, therewith, will use commercially reasonable efforts to comply in all respects with the Company’s reporting,
filing and other obligations under the bylaws or rules of such market or exchange, as applicable. The provisions of this Section 7.2
shall terminate and be of no further force and effect on the date on which the Company’s obligations under the Registration
Rights Agreement to register or maintain the effectiveness of any registration covering the Registrable Securities (as such term
is defined in the Registration Rights Agreement) shall terminate.

 

7.3.            Acknowledgment
of Dilution. The Company acknowledges that the issuance of the Closing Securities may result in dilution of the outstanding
shares of Common Stock, which dilution may be substantial under certain market conditions. The Company further acknowledges that
its obligations under the Transaction Documents, including, without limitation, its obligation to issue the Closing Securities
pursuant to this Agreement, are unconditional and absolute and not subject to any right of set off, counterclaim, delay or reduction,
regardless of the effect of any such dilution or any claim the Company may have against any Investor and regardless of the dilutive
effect that such issuance may have on the ownership of the other stockholders of the Company.

 

7.4.            Form D.
The Company agrees to timely file a Form D with respect to the Securities as required under Regulation D and to provide a
copy thereof, promptly upon request of an Investor.

 

7.5.            Removal
of Legends. In connection with any sale or disposition of the Shares or the Warrant Shares by an Investor pursuant to Rule 144
under the 1933 Act (“Rule 144”) or pursuant to any other exemption under the 1933 Act such that the purchaser
acquires freely tradable shares and upon compliance by the Investor with the requirements of this Agreement, if requested by the
Investor, the Company shall cause the transfer agent for the Common Stock (the “Transfer Agent”) to timely remove
any restrictive legends related to such Shares or Warrant Shares, as applicable, and make a new, unlegended entry or certificate,
as the case may be, for such Shares or Warrant Shares sold or disposed of without restrictive legends, provided that the Company
has received customary representations and other documentation reasonably acceptable to the Company in connection therewith. Subject
to receipt by the Company of customary representations and other documentation reasonably acceptable to the Company in connection
therewith, upon the earliest of such time as the Shares or Warrant Shares, as applicable, (i) have been sold or transferred
pursuant to an effective registration statement, (ii)  have been sold pursuant to Rule 144, or (iii) are eligible
for resale under Rule 144(b)(1) or any successor provision, the Company shall (A) deliver to the Transfer Agent
irrevocable instructions that the Transfer Agent shall make a new, unlegended entry (or issue a new, unlegended certificate) for
such Shares or Warrant Shares, and (B) cause its counsel to deliver to the Transfer Agent one or more opinions to the effect
that the removal of such legends in such circumstances may be effected under the 1933 Act. The Company shall be responsible for
the fees of its Transfer Agent and all DTC fees associated with such issuance. The Company acknowledges that a breach by it of
its obligations under this Section 7.5 may cause irreparable harm to an Investor. Accordingly, the Company acknowledges that
the remedy at law for a breach of its obligations under this Section 7.5 may be inadequate and agrees, in the event of a breach
or threatened breach by the Company of the provisions of this Section 7.5, that an Investor shall be entitled, in addition
to all other available remedies, to an order and/or injunction restraining any breach and requiring immediate issuance and transfer,
without the necessity of showing economic loss and without any bond or other security being required.

 

    	 	24	 

     

    

 

7.6.           Reservation
of Common Stock. The Company shall take all action necessary to at all times have authorized, and reserved for the purpose
of issuance from and after the Closing Date, the number of shares of Common Stock issuable upon exercise of the Warrants issued
at the Closing (without taking into account any limitations on exercise of the Warrants set forth therein).

 

7.7.           Fees.
The Company shall be responsible for the payment of any placement agent fees, financial advisory fees, or broker’s commissions
(other than for Persons engaged by any Investor) relating to or arising out of the transactions contemplated hereby, including,
without limitation, any fees or commissions payable to the Placement Agents.

 

7.8.           Subsequent
Equity Sales. From the date hereof until the later of (i) the date that is 75 days after the date of this Agreement and
(ii) the date that is 30 trading days after the date that a registration statement covering the resale of the Shares and the
Warrant Shares is declared effective by the SEC (the “Lock-Up Period”), neither the Company nor any Subsidiary
shall issue, enter into any agreement to issue or announce the issuance or proposed issuance of any shares of Common Stock or securities
of the Company or the Subsidiaries which would entitle the holder thereof to acquire at any time Common Stock, including, without
limitation, any debt, preferred stock, right, option, warrant or other instrument that is at any time convertible into or exercisable
or exchangeable for, or otherwise entitles the holder thereof to receive, Common Stock, except, in each case, for (i) issuances
of Common Stock upon the conversion of convertible securities, including preferred stock, the exercise of options or warrants and
the vesting of restricted stock outstanding on the date hereof, in each case, as included or described in the SEC Filings, (ii) the
issuance of shares of Common Stock or stock options pursuant to employee benefit or equity incentive plans described in the SEC
Filings, and (iii) the issuance of up to 5% of the outstanding Common Stock (measured as of the date hereof) in connection
with (A) the acquisition or license of the securities, business, property, technologies or other assets of another person
or entity, including pursuant to an employee benefit plan assumed by the Company or its subsidiaries in connection with such acquisition
or (B) joint ventures, commercial relationships or other strategic transactions, and in the case of each of clauses (A) and
(B), the filing of a registration statement with respect thereto.

 

    	 	25	 

     

    

 

7.9.           Short
Sales and Confidentiality After the Date Hereof. Each Investor covenants that neither it nor any Affiliates acting on its behalf
or pursuant to any understanding with it will execute any Short Sales during the period from the date hereof until the earlier
of such time as (i) after the transactions contemplated by this Agreement are first publicly announced or (ii) this Agreement
is terminated in full. Except as otherwise required by law, each Investor covenants that until such time as the transactions contemplated
by this Agreement are publicly disclosed by the Company, such Investor will maintain the confidentiality of all disclosures made
to it in connection with this transaction (including the existence and terms of this transaction). Each Investor understands and
acknowledges that the SEC currently takes the position that coverage of short sales of shares of the Common Stock “against
the box” prior to effectiveness of a resale registration statement with securities included in such registration statement
would be a violation of Section 5 of the 1933 Act, as set forth in Item 239.10 of the 1933 Act Rules Compliance and Disclosure
Interpretations compiled by the Office of Chief Counsel, Division of Corporation Finance.

 

7.10.         Adjustments
in Share Numbers and Prices. In the event of any stock split, subdivision, dividend or distribution payable in shares of Common
Stock (or other securities or rights convertible into, or entitling the holder thereof to receive directly or indirectly shares
of Common Stock), combination or other similar recapitalization or event occurring after the date hereof and prior to the Closing,
each reference in any Transaction Document to a number of shares or a price per share shall be deemed to be amended to appropriately
and fully account for such event.

 

8.            Survival
and Indemnification.

 

8.1.           Survival.
Subject to applicable statutes of limitations, the representations, warranties, covenants, and agreements contained in this Agreement
shall survive the Closing for a period of two (2) years after the date hereof and thereafter shall have no further force and
effect.

 

8.2.           Indemnification
by the Company. The Company agrees to indemnify and hold harmless each of the Investors, the officers, directors, partners,
members, and employees of each Investor, each Affiliate of any such Investor (within the meaning of Section 15 of the 1933
Act or Section 20 of the 1934 Act) and the officers, directors, partners, members and employees of each such Affiliate (each,
an “Indemnified Party”), against any losses, claims, damages, liabilities or expenses (“Losses”),
joint or several, to which such Indemnified Party may become subject, insofar as such losses, claims, damages, liabilities or expenses
(or actions in respect thereof as contemplated below) arise out of or are based in whole or in part on the inaccuracy in the representations
and warranties of the Company contained in this Agreement or the failure of the Company to perform its obligations hereunder, and
will reimburse each Indemnified Party for legal and other expenses reasonably incurred as such expenses are reasonably incurred
by such Indemnified Party in connection with investigating, defending, settling, compromising or paying such loss, claim, damage,
liability, expense or action; provided, however, that the Company will not be liable in any such case to the extent
that any such loss, claim, damage, liability or expense arises out of or is based upon (i) the failure of such Indemnified
Party to comply with the covenants and agreements contained herein, or (ii) the inaccuracy of any representations made by
such Indemnified Party herein.

 

    	 	26	 

     

    

 

8.3.            Indemnification
Procedure. Promptly after any Indemnified Party has received notice of any indemnifiable claim hereunder, or the commencement
of any action, suit or proceeding by a third Person, which the Indemnified Party believes in good faith is an indemnifiable claim
under this Agreement, the Indemnified Party shall give the indemnitor hereunder (the “Indemnifying Party”) written
notice of such claim or the commencement of such action, suit or proceeding, but failure to so notify the Indemnifying Party will
not relieve the Indemnifying Party from any liability it may have to such Indemnified Party hereunder except to the extent that
the Indemnifying Party is materially prejudiced by such failure. Such notice shall state the nature and the basis of such claim
to the extent then known. The Indemnifying Party shall have the right to defend and settle, at its own expense and by its own counsel
who shall be reasonably acceptable to the Indemnified Party, any such matter as long as the Indemnifying Party acknowledges that
the Indemnifying Party is responsible for indemnifying the Indemnified Party with respect to such matter and pursues the same diligently
and in good faith and so long as (i) such matter does not involve criminal liability and (ii) equitable relief is not
sought against the Indemnified Party. If the Indemnifying Party undertakes to defend or settle, it shall promptly notify the Indemnified
Party of its intention to do so, and the Indemnified Party shall cooperate with the Indemnifying Party and its counsel in all commercially
reasonable respects in the defense thereof and the settlement thereof. Such cooperation shall include, but shall not be limited
to, furnishing the Indemnifying Party with any books, records and other information reasonably requested by the Indemnifying Party
and in the Indemnified Party’s possession or control. Such cooperation of the Indemnified Party shall be at the cost of the
Indemnifying Party. After the Indemnifying Party has notified the Indemnified Party of its intention to undertake to defend or
settle any such asserted liability, and for so long as the Indemnifying Party diligently pursues such defense, the Indemnifying
Party shall not be liable for any additional legal expenses incurred by the Indemnified Party in connection with any defense or
settlement of such asserted liability; provided, however, that the Indemnified Party shall be entitled (i) at
its expense, to participate in the defense of such asserted liability and the negotiations of the settlement thereof and (ii) if
(a) the Indemnifying Party has failed to assume the defense or employ counsel reasonably acceptable to the Indemnified Party
or (b) if counsel to the Indemnified Party shall have concluded that there may be reasonable defenses available to the Indemnified
Party that are different from or in addition to those available to the Indemnifying Party or if the interests of the Indemnified
Party reasonably may be deemed to conflict with the interests of the Indemnifying Party, then the Indemnified Party shall have
the right to select a separate counsel and to assume such legal defense and otherwise to participate in the defense of such action,
with the expenses and fees of such separate counsel and other expenses related to such participation to be reimbursed by the Indemnifying
Party as incurred. Notwithstanding any other provision of this Agreement, the Indemnifying Party shall not settle any indemnified
claim without the consent of the Indemnified Party, unless the settlement thereof imposes no liability or obligation on, and includes
a complete release from liability of, and does not include any admission of wrongdoing or malfeasance by, the Indemnified Party.

 

8.4.            Gross-Up.
For the avoidance of doubt, the amount of any Losses subject to indemnification pursuant to this Section 8 paid to an
Indemnified Party shall include a gross-up to take into account such Indemnified Party’s and its Affiliates’ equity
ownership in the Company such that, after payment of the grossed-up amount, such Indemnified Party will not have suffered any Losses.

 

8.5.           Treatment.
All amounts paid pursuant to this Section 8 shall, to the extent permitted by applicable law, be treated as adjustments to
the purchase price for all tax purposes.

 

    	 	27	 

     

    

 

9.            Miscellaneous.

 

9.1.            Successors
and Assigns. This Agreement may not be assigned by a party hereto without the prior written consent of the Company or the Investors,
as applicable; provided, however, that an Investor may assign its rights and delegate its duties hereunder in whole
or in part to an Affiliate without the prior written consent of the Company or the other Investors, provided such assignee agrees
in writing to be bound by the provisions hereof that apply to Investors. The provisions of this Agreement shall inure to the benefit
of and be binding upon the respective permitted successors and assigns of the parties. Without limiting the generality of the foregoing,
in the event that the Company is a party to a merger, consolidation, share exchange or similar business combination transaction
in which the Common Stock is converted into the equity securities of another Person, from and after the effective time of such
transaction, such Person shall, by virtue of such transaction, be deemed to have assumed the obligations of the Company hereunder,
the term “Company” shall be deemed to refer to such Person and the term “Securities” shall be deemed to
refer to the securities received by the Investors in connection with such transaction. Nothing in this Agreement, express or implied,
is intended to confer upon any party other than the parties hereto or their respective permitted successors and assigns any rights,
remedies, obligations, or liabilities under or by reason of this Agreement, except as expressly provided in this Agreement.

 

9.2.            Counterparts;
Faxes; E-mail. This Agreement may be executed in one or more counterparts, each of which shall be deemed an original, but all
of which together shall constitute one and the same instrument. This Agreement may also be executed via facsimile or e-mail, which
shall be deemed an original.

 

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

 

9.4.            Notices.
All notices and other communications under this Agreement must be in writing and are deemed duly delivered when (i) delivered,
if delivered personally or by nationally recognized overnight courier service (costs prepaid), (ii) sent by email with confirmation
of receipt by the recipient or (iii) received or rejected by the addressee, if sent by United States of America certified
or registered mail, return receipt requested; in each case to the following addresses or facsimile numbers and marked to the attention
of the individual (by name or title) designated below (or to such other address, facsimile number or individual as a party may
designate by notice to the other parties):

 

If to the Company:

 

Entasis Therapeutics Holdings Inc.

35 Gatehouse Drive

Waltham, MA 02451

Attention: Elizabeth Keiley

Telephone: (781) 870-0120

E-mail: betzy.keiley@entasistx.com

 

    	 	28	 

     

    

 

With a copy (which will not constitute notice)
to:

 

Covington & Burling LLP

The New York Times Building

620 Eighth Avenue

New York, New York 10018

Attention: Brian K. Rosenzweig and Jack S.
Bodner

Telephone: (212) 841-1108

Facsimile: (646) 441-9108

E-mail: brosenzweig@cov.com

 

If to the Investors:

 

to the addresses set forth on the
signature pages hereto.

 

9.5.           Expenses.
The parties hereto shall pay their own costs and expenses in connection herewith regardless of whether the transactions contemplated
hereby are consummated; it being understood that each of the Company and each Investor has relied on the advice of its own respective
counsel. The Company shall pay any Transfer Agent fees, stamp taxes and other taxes and duties levied in connection with the sale
and issuance of the Closing Securities to the Investors. Notwithstanding the foregoing or anything to the contrary contained herein,
upon the earlier of the Closing and the valid termination of this Agreement (other than due to a breach by the Investor seeking
reimbursement), the Company shall promptly reimburse each Investor for all reasonable and documented fees and expenses of such
Investor and its Affiliates and representatives (including the fees and expenses of counsel) incurred prior to, on or after the
date hereof in connection with the examination, review, due diligence investigation, documentation, negotiation, closing and funding
of the transactions contemplated by this Agreement. Notwithstanding anything to the contrary herein, this Section 9.5 shall
survive the termination of this Agreement.

 

9.6.           Amendments
and Waivers. Any term of this Agreement may be amended and the observance of any term of this Agreement may be waived (either
generally or in a particular instance and either retroactively or prospectively), only with the written consent of the Company
and (i) prior to the Closing, each of the Investors and (ii) following the Closing, the Required Investors. Notwithstanding
the foregoing, Sections 4, 5 and 9.10 of this Agreement may not be amended, terminated or waived in a manner that is material and
adverse to the Placement Agents without the written consent of the Placement Agents. Any amendment or waiver effected in accordance
with this paragraph shall be binding upon (a) prior to Closing, each Investor and (b) following the Closing, each holder
of any Securities purchased under this Agreement at the time outstanding, and in each case, each future holder of all such Securities
and the Company.

 

9.7.           Publicity.
Except as set forth below, no public release or announcement concerning the transactions contemplated hereby shall be issued by
the Company or the Investors without the prior written consent of the Company (in the case of a release or announcement by the
Investors) or the Investors (in the case of a release or announcement by the Company), except as such release or announcement may
be required by law or the applicable rules or regulations of any securities exchange or securities market, in which case the
Company or the Investors, as the case may be, shall allow the Investors or the Company, as applicable, to the extent reasonably
practicable in the circumstances, reasonable time to comment on such release or announcement in advance of such issuance. By 9:00
A.M. (New York City time) on the Closing Date, the Company shall issue a press release in a form reasonably acceptable to
the Investors disclosing all material terms of transactions contemplated by this Agreement (the “Press Release”).
No later than 5:30 p.m. (New York City time) on the fourth Business Day following the date of this Agreement, the Company
will file a Current Report on Form 8-K (the “8-K”) attaching the press release described in the foregoing
sentence as well as copies of the Transaction Documents. The Company shall provide the 8-K to the Investors at least two (2) Business
Days prior to the date of filing and shall consider in good faith any comments to the 8-K proposed by the Investors.

 

    	 	29	 

     

    

 

9.8            Provision
Respecting Legal Representation. Each Investor hereby agrees, on its own behalf and on behalf of its directors, members, partners,
officers, employees and affiliates, that Covington & Burling LLP (“Covington”) has served as counsel
to the Company (and not such Investor or any of its directors, members, partners, officers, employees or affiliates) in connection
with the negotiation, preparation, execution and delivery of this Agreement and the consummation of the transactions contemplated
hereby. By purchasing Securities pursuant to this Agreement, such Investor irrevocably waives any conflict of interest arising
from such representation of the Company, even though the interests of such Investor may be directly adverse to the Company and
even though Covington may be handling ongoing unrelated matters for such Investor. Such Investor also hereby agrees that, following
consummation of the transactions contemplated hereby, Covington (or any successor) may serve as counsel to the Company in connection
with any amendment, modification, waiver or consent under or in respect of this Agreement, and such Investor hereby irrevocably
consents thereto and irrevocably waives any conflict of interest arising therefrom, and such Investor shall cause its affiliates
to irrevocably consent to waive any conflict of interest arising from such representation, even though the interests of the Investor
may be directly adverse to the Company, and even though Covington may be handling ongoing unrelated matters for such Investor.

 

9.9.           Severability.
Any provision of this Agreement that is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof but shall be interpreted
as if it were written so as to be enforceable to the maximum extent permitted by applicable law, and any such prohibition or unenforceability
in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction. To the extent permitted
by applicable law, the parties hereby waive any provision of law which renders any provision hereof prohibited or unenforceable
in any respect.

 

9.10.         No
Third-Party Beneficiaries. The Placement Agents shall be third-party beneficiaries of Section 4, Section 5 and this
Section 9.10 hereof and are entitled to the rights and benefits thereunder and may enforce the provisions thereof as if they
were parties thereto. This Agreement is intended for the benefit of the parties hereto and their respective successors and permitted
assigns and is not for the benefit of, nor may any provision hereof be enforced by, any other Person, except as otherwise set forth
in Section 8 and this Section 9.10.

 

    	 	30	 

     

    

 

9.11.         Entire
Agreement. This Agreement, including the signature pages, Exhibits and the Disclosure Schedules, the other Transaction Documents
and any oral or written agreement between the Company and any Investor regarding confidentiality matters that was entered into
in connection with the transactions contemplated hereby constitute the entire agreement among the parties hereof with respect to
the subject matter hereof and thereof and supersede all prior agreements and understandings, both oral and written, between the
parties with respect to the subject matter hereof and thereof.

 

9.12.         Further
Assurances. The parties shall execute and deliver all such further instruments and documents and take all such other actions
as may reasonably be required to carry out the transactions contemplated hereby and to evidence the fulfillment of the agreements
herein contained.

 

9.13.         Governing
Law; Consent to Jurisdiction; Waiver of Jury Trial. This Agreement shall be governed by, and construed in accordance with,
the internal laws of the State of New York without regard to the choice of law principles thereof (other than Sections 5-1401 and
5-1402 of the General Obligations Law). Each of the parties hereto irrevocably submits to the exclusive jurisdiction of the courts
of the State of New York located in New York County and the United States District Court for the Southern District of New York
for the purpose of any suit, action, proceeding or judgment relating to or arising out of this Agreement and the transactions contemplated
hereby. Service of process in connection with any such suit, action or proceeding may be served on each party hereto anywhere in
the world by the same methods as are specified for the giving of notices under this Agreement. Each of the parties hereto irrevocably
consents to the jurisdiction of any such court in any such suit, action or proceeding and to the laying of venue in such court.
Each party hereto irrevocably waives any objection to the laying of venue of any such suit, action or proceeding brought in such
courts and irrevocably waives any claim that any such suit, action or proceeding brought in any such court has been brought in
an inconvenient forum. EACH OF THE PARTIES HERETO WAIVES ANY RIGHT TO REQUEST A TRIAL BY JURY IN ANY LITIGATION WITH RESPECT
TO THIS AGREEMENT AND REPRESENTS THAT COUNSEL HAS BEEN CONSULTED SPECIFICALLY AS TO THIS WAIVER.

 

9.14.         Specific
Performance. It is understood and agreed by the parties that irreparable damage would occur if any provision of this Agreement
were not performed in accordance with the terms hereof and that the parties shall be entitled to an injunction or injunctions without
the necessity of posting a bond to prevent breaches of this Agreement or to enforce specifically the performance of the terms and
provisions hereof, in addition to any other remedy to which they are entitled at law or in equity. Unless otherwise expressly stated
in this Agreement, no right or remedy described or provided in this Agreement is intended to be exclusive or to preclude a Party
from pursuing other rights and remedies to the extent available under this Agreement, at law or in equity.

 

9.15.         Independent
Nature of Investors’ Obligations and Rights. The obligations of each Investor under any Transaction Document are several
and not joint with the obligations of any other Investor, and no Investor shall be responsible in any way for the performance of
the obligations of any other Investor under any Transaction Document. The decision of each Investor to purchase Closing Securities
pursuant to the Transaction Documents has been made by such Investor independently of any other Investor. Nothing contained herein
or in any Transaction Document, and no action taken by any Investor pursuant thereto, shall be deemed to constitute the Investors
as a partnership, an association, a joint venture or any other kind of entity, or create a presumption that the Investors are in
any way acting in concert or as a group with respect to such obligations or the transactions contemplated by the Transaction Documents.
Each Investor acknowledges that no other Investor has acted as agent for such Investor in connection with making its investment
hereunder and that no Investor will be acting as agent of such Investor in connection with monitoring its investment in the Closing
Securities or enforcing its rights under the Transaction Documents. Each Investor shall be entitled to independently protect and
enforce its rights, including, without limitation, the rights arising out of this Agreement or out of the other Transaction Documents,
and it shall not be necessary for any other Investor to be joined as an additional party in any proceeding for such purpose.

 

    	 	31	 

     

    

 

9.16.         No
Recourse. Notwithstanding anything that may be expressed or implied in this Agreement, each party covenants, agrees and acknowledges
that no recourse under this Agreement or any documents or instruments delivered in connection with this Agreement shall be had
against any party’s Affiliates, or any of such party’s or such party’s Affiliates’ former, current or future
director, officer, agent, employee, general or limited partner, member, manager or stockholder (collectively “Related
Parties”), in each case other than the parties to this Agreement and each of their respective successors and permitted
assigns under this Agreement, whether by the enforcement of any assessment or by any legal or equitable proceeding, or by virtue
of any applicable Law, it being expressly agreed and acknowledged that no personal liability whatsoever shall attach to, be imposed
on or otherwise be incurred by any of the Related Parties, as such, for any obligation or liability of any party under this Agreement
or any documents or instruments delivered in connection herewith for any claim based on, in respect of or by reason of such obligations
or liabilities or their creation; provided, however, that nothing in this Section 9.16 shall relieve or otherwise limit the
liability of any party hereto or any of their respective successors or permitted assigns for any breach or violation of its obligations
under this Agreement or such other documents or instruments. For the avoidance of doubt, none of the parties will have any recourse,
be entitled to commence any proceeding or make any claim under this Agreement or in connection with the transactions contemplated
hereby except against any of the parties or their respective successors and permitted assigns, as applicable.

 

[remainder of page intentionally left
blank]

 

    	 	32	 

     

    

 

IN WITNESS WHEREOF, the parties have executed
this Agreement or caused their duly authorized officers to execute this Agreement as of the date first above written.

 

 

	COMPANY:	ENTASIS THERAPEUTICS HOLDINGS INC.
	 	 
	 	 
	 	By:	/s/ Manoussos Perros, Ph.D.
	 	 	Name:	Manoussos Perros, Ph.D.
	 	 	Title:	President and Chief Executive Officer

 

     

     

    

 

[PURCHASER SIGNATURE PAGES TO ENTASIS THERAPEUTICS HOLDINGS
INC. SECURITIES PURCHASE AGREEMENT]

 

IN WITNESS WHEREOF, the undersigned have
caused this Securities Purchase Agreement to be duly executed by their respective authorized signatories as of the date first indicated
above.

 

Name of Purchaser: Armistice Capital Master Fund Ltd.

 

	Signature of Authorized Signatory of Purchaser: 	 	/s/ Steve Boyd

Name of Authorized Signatory: Steve Boyd

Title of Authorized Signatory: CIO of Armistice Capital, LLC,
the Investment Manager

Email Address of Authorized Signatory: [***]

Facsimile Number of Authorized Signatory: [***]

Address for Notice to Purchaser: [***]

Address for Delivery of Warrants to Purchaser (if not the same
as address for notice):

Subscription Amount: ______

Shares: ______

Warrant Shares: ______Beneficial Ownership Blocker: x4.99%
or  ̈9.99% or  ̈19.99%

Tax Identification Number: [***]

 ̈ Notwithstanding anything contained in this Agreement to the
contrary, by checking this box (i) the obligations of the above-signed to purchase the securities set forth in this Agreement
to be purchased from the Company by the above-signed, and the obligations of the Company to sell such securities to the above-signed,
shall be unconditional and all conditions to Closing shall be disregarded, (ii) the Closing shall occur by the second (2nd)
Trading Day following the date of this Agreement and (iii) any condition to Closing contemplated by this Agreement (but prior
to being disregarded by clause (i) above) that required delivery by the Company or the above-signed of any agreement, instrument,
certificate or the like or purchase price (as applicable) shall no longer be a condition and shall instead be an unconditional
obligation of the Company or the above-signed (as applicable) to deliver such agreement, instrument, certificate or the like or
purchase price (as applicable) to such other party on the Closing Date.

 

[SIGNATURE PAGES CONTINUE]

 

     

     

    

 

	INNOVIVA, INC.	 
	 	 
	 	By:	/s/ Pavel Raifeld
	 	 	Name:	Pavel Raifeld
	 	 	Title:	CEO

 

	Investor Information	 
	Entity Name:	Innoviva, Inc.
	Contact Person:	[***]
	Address:	[***]
	City:	[***]
	State:	[***]
	Zip Code:	[***]
	Telephone:	[***]
	Facsimile:	[***]
	Email:	[***]
	With a copy, which shall not constitute notice to: 	[***]
	Tax ID # or Social Security #:	[***]
	Name in which Shares should be issued:	Innoviva, Inc.

 

[Signature Page to Securities Purchase Agreement]

 

     

     

    

 

Schedule 4.3

 

[***]

 

     

     

    

 

EXHIBIT A

 

Schedule of Investors

 

	Investor Name	 	Number of

 Shares 

to be

 Purchased	 	 	Aggregate

 Purchase

 Price of

 Shares	 	 	Number of

 Common

 Warrants 

to be

 Purchased	 	 	Aggregate

 Purchase

 Price of

 Common

 Warrants	 	 	Number of

 Pre-Funded

 Common

 Warrants 

to the

 Purchased	 	 	Aggregate

 Purchase

 Price of

 Pre-Funded

 Common

 Warrants	 	 	Aggregate

 Purchase

 Price of

 Closing

 Securities	 
	Innoviva, Inc.	 	 	4,672,897	 	 	$	12,499,999.48	 	 	 	4,672,897	 	 	 	-	 	 	 	-	 	 	 	-	 	 	$	12,499,999.48	 
	Armistice Capital Master Fund Ltd.	 	 	3,510,981	 	 	$	9,391,874.18	 	 	 	4,672,897	 	 	 	-	 	 	 	1,161,916	 	 	$	3,108,125.30	 	 	$	12,499,999.48	 
	Totals:	 	 	8,183,878	 	 	$	21,891,873.66	 	 	 	9,345,794	 	 	 	-	 	 	 	1,161,916	 	 	$	3,108,125.30	 	 	$	24,999,998.96	 

 

     

     

    

 

EXHIBIT B-1

 

Form of Warrant

 

     

     

    

 

EXHIBIT B-2

 

Form of Pre-Funded Warrant

 

     

     

    

 

EXHIBIT C

 

Form of Registration Rights Agreement

 

     

     

    

 

EXHIBIT D

 

Form of Lock-Up Agreement

 

     

     

    

 

APPENDIX I

 

Form of Investor Questionnaire

 

     

     

    

 

APPENDIX II

 

Form of Selling Stockholder Questionnaire

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