Document:

Exhibit 4.3

 

PLACEMENT AGENT COMMON STOCK PURCHASE
WARRANT

 

ONCONOVA THERAPEUTICS, INC.

 

	Warrant Shares:	 	Issue Date: November 25, 2019

 

	 	 	Initial Exercise Date: November 25, 2019

 

THIS PLACEMENT AGENT COMMON STOCK PURCHASE
WARRANT (the “Warrant”) certifies that, for value received,                       
or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the
conditions hereinafter set forth, at any time on or after the date set forth above (the “Initial Exercise Date”)
and on or prior to 5:00 p.m. (New York City time) on November 21, 2024 (the “Termination Date”) but
not thereafter, to subscribe for and purchase from Onconova Therapeutics, Inc., a Delaware corporation (the “Company”),
up to                       
shares (as subject to adjustment hereunder, the “Warrant Shares”) of the Company’s Common Stock. The purchase
price of one share of Common Stock under this Warrant shall be equal to the Exercise Price, as defined in Section 2(b). 
This Warrant is issued pursuant to that certain engagement letter, dated as of September 20, 2019, by and between the Company and
H.C. Wainwright & Co., LLC (the “Engagement Letter”).

 

Section 1.             
Definitions.  In addition to the terms defined elsewhere in this Warrant, the following terms have the meanings indicated
in this Section 1:

 

“Affiliate” means any
Person that, directly or indirectly through one or more intermediaries, controls or is controlled by or is under common control
with a Person, as such terms are used in and construed under Rule 405 under the Securities Act.

 

“Bid Price” means, for
any date, the price determined by the first of the following clauses that applies: (a) if the Common Stock is then listed
or quoted on a Trading Market, the bid price of the Common Stock for the time in question (or the nearest preceding date) on the
Trading Market on which the Common Stock is then listed or quoted as reported by Bloomberg L.P. (based on a Trading Day from 9:30
a.m. (New York City time) to 4:02 p.m. (New York City time)), (b)  if OTCQB or OTCQX is not a Trading Market, the
volume weighted average price of the Common Stock for such date (or the nearest preceding date) on OTCQB or OTCQX as applicable,
(c) if the Common Stock is not then listed or quoted for trading on OTCQB or OTCQX and if prices for the Common Stock are
then reported on The Pink Open Market (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 (d) in all other cases, the fair market value of a share
of Common Stock as determined by an independent appraiser selected in good faith by the Holders of a majority in interest of the
Warrants then outstanding and reasonably acceptable to the Company, the fees and expenses of which shall be paid by the Company.

 

“Board of Directors” means
the board of directors of the Company.

 

“Commission” means the
United States Securities and Exchange Commission.

 

“Common Stock” means the
common stock of the Company, par value $0.01 per share, and any other class of securities into which such securities may hereafter
be reclassified or changed.

 

“Common Stock Equivalents”
means any securities of the Company or its subsidiaries which would entitle the holder thereof to acquire at any time shares of
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.

 

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

 

    

     

    

 

“Person” means an individual
or corporation, partnership, trust, incorporated or unincorporated association, joint venture, limited liability company, joint
stock company, government (or an agency or subdivision thereof) or other entity of any kind.

 

“Purchase Agreement” means
that certain Securities Purchase Agreement, dated as of November 21, 2019, by and among the Company and the purchasers signatory
thereto.

 

“Registration Statement”
means the Company’s registration statement on Form S-1 (File No. 333-234360), including the final prospectus filed
in connection with the transaction contemplated by the Purchase Agreement.

 

“Securities Act” means
the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

 

“Trading Day” means a day
on which the Common Stock is traded on a Trading Market.

 

“Trading Market” means
any of the following markets or exchanges on which the Common Stock is listed or quoted for trading on the date in question: the
NYSE American, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market or the New York Stock Exchange
(or any successors to any of the foregoing).

 

“Transfer Agent” means
EQ Shareowner Services, the current transfer agent of the Company, with a mailing address of P.O. Box 64945, St. Paul, MN
55164-0945 and any successor transfer agent of the Company.

 

“VWAP” means, for any date,
the price determined by the first of the following clauses that applies: (a) if the Common Stock is then listed or quoted
on a Trading Market, the daily volume weighted average price of the Common Stock for such date (or the nearest preceding date)
on the Trading Market on which the Common Stock is then listed or quoted as reported by Bloomberg L.P. (based on a Trading Day
from 9:30 a.m. (New York City time) to 4:02 p.m. (New York City time)), (b)  if OTCQB or OTCQX is not a Trading
Market, the volume weighted average price of the Common Stock for such date (or the nearest preceding date) on OTCQB or OTCQX as
applicable, (c) if the Common Stock is not then listed or quoted for trading on OTCQB or OTCQX and if prices for the Common
Stock are then reported on The Pink Open Market (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 (d) in all other cases, the fair market value of a
share of Common Stock as determined by an independent appraiser selected in good faith by the Holders of a majority in interest
of the Warrants then outstanding and reasonably acceptable to the Company, the fees and expenses of which shall be paid by the
Company.

 

“Warrants” means this Warrant
and other Placement Agent Common Stock purchase warrants issued by the Company pursuant to the Engagement Letter.

 

Section 2.             
Exercise.

 

a)            Exercise
of Warrant.  Exercise of the purchase rights represented by this Warrant may be made, in whole or in part, at any
time or times on or after the Initial Exercise Date and on or before the Termination Date by delivery to the Company of a
duly executed facsimile copy or PDF copy submitted by e-mail (or e-mail attachment) of the Notice of Exercise in the form
annexed hereto (the “Notice of Exercise”).  Within the earlier of (i) two (2) Trading Days
and (ii) the number of Trading Days comprising the Standard Settlement Period (as defined in
Section 2(d)(i) herein) following the date of exercise as aforesaid, the Holder shall deliver the aggregate
Exercise Price for the Warrant Shares specified in the applicable Notice of Exercise by wire transfer or cashier’s
check drawn on a United States bank unless the cashless exercise procedure specified in Section 2(c) below is
specified in the applicable Notice of Exercise.  No ink-original Notice of Exercise shall be required, nor shall any
medallion guarantee (or other type of guarantee or notarization) of any Notice of Exercise be required.  Notwithstanding
anything herein to the contrary, the Holder shall not be required to physically surrender this Warrant to the Company until
the Holder has purchased all of the Warrant Shares available hereunder and the Warrant has been exercised in full, in which
case, the Holder shall surrender this Warrant to the Company for cancellation within three (3) Trading Days of the date
on which the final Notice of Exercise is delivered to the Company. Partial exercises of this Warrant resulting in purchases
of a portion of the total number of Warrant Shares available hereunder shall have the effect of lowering the
outstanding number of Warrant Shares purchasable hereunder in an amount equal to the applicable number of Warrant Shares
purchased.  The Holder and the Company shall maintain records showing the number of Warrant Shares purchased and the
date of such purchases. The Company shall deliver any objection to any Notice of Exercise within one (1) Trading Day of
receipt of such notice.  The Holder and any assignee, by acceptance of this Warrant, acknowledge and agree that, by
reason of the provisions of this paragraph, following the purchase of a portion of the Warrant Shares hereunder, the number
of Warrant Shares available for purchase hereunder at any given time may be less than the amount stated on the face
hereof.

 

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b)           
Exercise Price.  The exercise price per share of Common Stock under this Warrant shall be $0.25, subject to
adjustment hereunder (the “Exercise Price”).

  

c)            
Cashless Exercise. If at the time of exercise hereof there is no effective registration statement registering, or the prospectus
contained therein is not available for the issuance or resale of the Warrant Shares to or by the Holder, then this Warrant may
also be exercised, in whole or in part, at such time by means of a “cashless exercise” in which the Holder shall be
entitled to receive a number of Warrant Shares equal to the quotient obtained by dividing [(A-B) (X)] by (A), where:

 

(A) = as applicable: (i) the
VWAP on the Trading Day immediately preceding the date of the applicable Notice of Exercise if such Notice of Exercise is (1) both
executed and delivered pursuant to Section 2(a) hereof on a day that is not a Trading Day or (2) both executed and
delivered pursuant to Section 2(a) hereof on a Trading Day prior to the opening of “regular trading hours”
(as defined in Rule 600(b)(68) of Regulation NMS promulgated under the federal securities laws) on such Trading Day, (ii) at
the option of the Holder, either (y) the VWAP on the Trading Day immediately preceding the date of the applicable Notice of
Exercise or (z) the Bid Price of the Common Stock on the principal Trading Market as reported by Bloomberg L.P. as of the
time of the Holder’s execution of the applicable Notice of Exercise if such Notice of Exercise is executed during “regular
trading hours” on a Trading Day and is delivered within two (2) hours thereafter (including until two (2) hours
after the close of “regular trading hours” on a Trading Day) pursuant to Section 2(a) hereof or (iii) the
VWAP on the date of the applicable Notice of Exercise if the date of such Notice of Exercise is a Trading Day and such Notice of
Exercise is both executed and delivered pursuant to Section 2(a) hereof after the close of “regular trading hours”
on such Trading Day;

 

(B) = the Exercise Price
of this Warrant, as adjusted hereunder; and

 

(X) = the number of Warrant
Shares that would be issuable upon exercise of this Warrant in accordance with the terms of this Warrant if such exercise were
by means of a cash exercise rather than a cashless exercise.

 

If Warrant Shares are issued in
such a cashless exercise, the parties acknowledge and agree that in accordance with Section 3(a)(9) of the Securities
Act, the Warrant Shares shall take on the registered characteristics of the Warrants being exercised.  The Company agrees
not to take any position contrary to this Section 2(c).

 

Notwithstanding anything herein
to the contrary, on the Termination Date, this Warrant shall be automatically exercised via cashless exercise pursuant to this
Section 2(c).

 

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d)           
Mechanics of Exercise.

 

i.                  Delivery
of Warrant Shares Upon Exercise.  The Company shall cause the Warrant Shares purchased hereunder to be
transmitted by the Transfer Agent to the Holder by crediting the account of the Holder’s or its designee’s
balance account with The Depository Trust Company through its Deposit or Withdrawal at Custodian system
(“DWAC”) if the Company is then a participant in such system and either (A) there is an effective
registration statement permitting the issuance of the Warrant Shares to or resale of the Warrant Shares by the Holder or
(B) this Warrant is being exercised via cashless exercise, and otherwise by physical delivery of a certificate,
registered in the Company’s share register in the name of the Holder or its designee, for the number of Warrant Shares
to which the Holder is entitled pursuant to such exercise to the address specified by the Holder in the Notice of Exercise by
the date that is the earlier of (A) the earlier of (i) two (2) Trading Days and (ii) the number of days
comprising the Standard Settlement Period, in each case after the delivery to the Company of the Notice of Exercise and
(B) one (1) Trading Day after delivery of the aggregate Exercise Price to the Company (such date, the
 “Warrant Share Delivery Date”). Upon delivery of the Notice of Exercise, the Holder shall be deemed for
all corporate purposes to have become the holder of record of the Warrant Shares with respect to which this Warrant has been
exercised, irrespective of the date of delivery of the Warrant Shares, provided that payment of the aggregate Exercise Price
(other than in the case of a cashless exercise) is received by the Warrant Share Delivery Date.  If the Company fails
for any reason to deliver to the Holder the Warrant Shares subject to a Notice of Exercise by the Warrant Share
Delivery Date, the Company shall pay to the Holder, in cash, as liquidated damages and not as a penalty, for each $1,000 of
Warrant Shares subject to such exercise (based on the VWAP of the Common Stock on the date of the applicable Notice of
Exercise), $10 per Trading Day (increasing to $20 per Trading Day on the fifth Trading Day after such liquidated damages
begin to accrue) for each Trading Day after such Warrant Share Delivery Date until such Warrant Shares are delivered or
Holder rescinds such exercise. The Company agrees to maintain a transfer agent that is a participant in the FAST program so
long as this Warrant remains outstanding and exercisable. As used herein, “Standard Settlement Period”
means the standard settlement period, expressed in a number of Trading Days, on the Company’s primary Trading Market
with respect to the Common Stock as in effect on the date of delivery of the Notice of Exercise.

 

ii.              
Delivery of New Warrants Upon Exercise.  If this Warrant shall have been exercised in part, the Company shall, at the
request of a Holder and upon surrender of this Warrant certificate, at the time of delivery of the Warrant Shares, deliver to the
Holder a new Warrant evidencing the rights of the Holder to purchase the unpurchased Warrant Shares called for by this Warrant,
which new Warrant shall in all other respects be identical with this Warrant.

 

iii.           
Rescission Rights.  If the Company fails to cause the Transfer Agent to transmit to the Holder the Warrant Shares pursuant
to Section 2(d)(i) by the Warrant Share Delivery Date, then the Holder will have the right to rescind such exercise.

 

iv.           Compensation
for Buy-In on Failure to Timely Deliver Warrant Shares Upon Exercise.  In addition to any other rights available to
the Holder, if the Company fails to cause the Transfer Agent to transmit to the Holder the Warrant Shares in accordance with
the provisions of Section 2(d)(i) above pursuant to an exercise on or before the Warrant Share Delivery Date,
and if after such date the Holder is required by its broker to purchase (in an open market transaction or otherwise) or the
Holder’s brokerage firm otherwise purchases, shares of Common Stock to deliver in satisfaction of a sale by the Holder
of the Warrant Shares which the Holder anticipated receiving upon such exercise (a “Buy-In”), then the
Company shall (A) pay in cash to the Holder the amount, if any, by which (x) the Holder’s total purchase
price (including brokerage commissions, if any) for the shares of Common Stock so purchased exceeds (y) the amount
obtained by multiplying (1) the number of Warrant Shares that the Company was required to deliver to the Holder in
connection with the exercise at issue times (2) the price at which the sell order giving rise to such purchase
obligation was executed, and (B) at the option of the Holder, either reinstate the portion of the Warrant and equivalent
number of Warrant Shares for which such exercise was not honored (in which case such exercise shall be deemed rescinded) or
deliver to the Holder the number of shares of Common Stock that would have been issued had the Company timely complied with
its exercise and delivery obligations hereunder.  For example, if the Holder purchases Common Stock having a total
purchase price of $11,000 to cover a Buy-In with respect to an attempted exercise of shares of Common Stock with an aggregate
sale price giving rise to such purchase obligation of $10,000, under clause (A) of the immediately preceding sentence
the Company shall be required to pay the Holder $1,000. The Holder shall provide the Company written notice indicating the
amounts payable to the Holder in respect of the Buy-In and, upon request of the Company, evidence of the amount of such
loss.  Nothing herein shall limit a Holder’s right to pursue any other remedies available to it hereunder, at law
or in equity including, without limitation, a decree of specific performance and/or injunctive relief with respect to
the Company’s failure to timely deliver shares of Common Stock upon exercise of the Warrant as required pursuant to the
terms hereof.

 

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v.           No
Fractional Shares or Scrip.  No fractional shares or scrip representing fractional shares shall be issued upon the exercise
of this Warrant.  As to any fraction of a share which the Holder would otherwise be entitled to purchase upon such exercise,
the Company shall round up to the next whole share.

 

vi          Charges,
Taxes and Expenses.  Issuance of Warrant Shares shall be made without charge to the Holder for any issue or transfer tax
or other incidental expense in respect of the issuance of such Warrant Shares, all of which taxes and expenses shall be paid by
the Company, and such Warrant Shares shall be issued in the name of the Holder or in such name or names as may be directed by the
Holder; provided, however, that in the event that Warrant Shares are to be issued in a name other than the name of
the Holder, this Warrant when surrendered for exercise shall be accompanied by the Assignment Form attached hereto duly executed
by the Holder and the Company may require, as a condition thereto, the payment of a sum sufficient to reimburse it for any transfer
tax incidental thereto.  The Company shall pay all Transfer Agent fees required for same-day processing of any Notice of Exercise
and all fees to the Depository Trust Company (or another established clearing corporation performing similar functions) required
for same-day electronic delivery of the Warrant Shares.

 

vii.           Closing of
Books.  The Company will not close its stockholder books or records in any manner which prevents the timely exercise of
this Warrant, pursuant to the terms hereof.

 

e)             Holder’s
Exercise Limitations.    The Company shall not effect any exercise of this Warrant, and a Holder shall not
have the right to exercise any portion of this Warrant, pursuant to Section 2 or otherwise, to the extent that after
giving effect to such issuance after exercise as set forth on the applicable Notice of Exercise, the Holder (together with
the Holder’s Affiliates, and any other Persons acting as a group together with the Holder or any of the
Holder’s Affiliates (such Persons, “Attribution Parties”)), would beneficially own in excess of the
Beneficial Ownership Limitation (as defined below).  For purposes of the foregoing sentence, the number of shares of
Common Stock beneficially owned by the Holder and its Affiliates and Attribution Parties shall include the number of shares
of Common Stock issuable upon 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 (i) exercise of the remaining, nonexercised
portion of this Warrant beneficially owned by the Holder or any of its Affiliates or Attribution Parties and
(ii) exercise or conversion of the unexercised or nonconverted portion of any other securities of the Company
(including, without limitation, any other Common Stock Equivalents) subject to a limitation on conversion or exercise
analogous to the limitation contained herein beneficially owned by the Holder or any of its Affiliates or Attribution
Parties.  Except as set forth in the preceding sentence, for purposes of this Section 2(e), beneficial ownership
shall be calculated in accordance with Section 13(d) of the Exchange Act and the rules and regulations
promulgated thereunder, it being acknowledged by the Holder that the Company is not representing to the Holder that such
calculation is in compliance with Section 13(d) of the Exchange Act and the Holder is solely responsible for
any schedules required to be filed in accordance therewith.   To the extent that the limitation contained in this
Section 2(e) applies, the determination of whether this Warrant is exercisable (in relation to other securities
owned by the Holder together with any Affiliates and Attribution Parties) and of which portion of this Warrant is exercisable
shall be in the sole discretion of the Holder, and the submission of a Notice of Exercise shall be deemed to be the
Holder’s determination of whether this Warrant is exercisable (in relation to other securities owned by the Holder
together with any Affiliates and Attribution Parties) and of which portion of this Warrant is exercisable, in each case
subject to the Beneficial Ownership Limitation, and the Company shall have no obligation to verify or confirm the accuracy of
such determination.   In addition, a determination as to any group status as contemplated above shall be determined
in accordance with Section 13(d) of the Exchange Act and the rules and regulations promulgated
thereunder.  For purposes of this Section 2(e), in determining the number of outstanding shares of Common Stock, a
Holder may rely on the number of outstanding shares of Common Stock as reflected in (A) the Company’s most recent
periodic or annual report filed with the Commission, as the case may be, (B) a more recent public announcement by the
Company or (C) a more recent written notice by the Company or the Transfer Agent setting forth the number of shares of
Common Stock outstanding.  Upon the written or oral request of a Holder, the Company shall within one
(1) Trading Day confirm orally and in writing to the 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 this Warrant, by the Holder or its Affiliates or Attribution Parties since
the date as of which such number of outstanding shares of Common Stock was reported.  The “Beneficial Ownership
Limitation” shall be 4.99% of the number of shares of the Common Stock outstanding immediately after giving effect
to the issuance of shares of Common Stock issuable upon exercise of this Warrant.  The Holder, upon notice to the
Company, may increase or decrease the Beneficial Ownership Limitation provisions of this Section 2(e), provided that the
Beneficial Ownership Limitation in no event exceeds 9.99% of the number of shares of the Common Stock outstanding immediately
after giving effect to the issuance of shares of Common Stock upon exercise of this Warrant held by the Holder and the
provisions of this Section 2(e) shall continue to apply.  Any increase in the Beneficial Ownership Limitation
will not be effective until the 61st day after such notice is delivered to the
Company.  The provisions of this paragraph shall be construed and implemented in a manner otherwise than in strict
conformity with the terms of this Section 2(e) to correct this paragraph (or any portion hereof) which may be
defective or inconsistent with the intended Beneficial Ownership Limitation herein contained or to make changes or
supplements necessary or desirable to properly give effect to such limitation. The limitations contained in this
paragraph shall apply to a successor holder of this Warrant.

 

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Section 3.             
Certain Adjustments.

 

a)           
Stock Dividends and Splits. If the Company, at any time while this Warrant is outstanding: (i) pays a stock dividend
or otherwise makes a distribution or distributions on shares of its Common Stock or any other equity or equity equivalent securities
payable in shares of Common Stock (which, for avoidance of doubt, shall not include any shares of Common Stock issued by the Company
upon exercise of this Warrant), (ii) subdivides outstanding shares of Common Stock into a larger number of shares, (iii) combines
(including by way of reverse stock split) outstanding shares of Common Stock into a smaller number of shares, or (iv) issues
by reclassification of shares of the Common Stock any shares of capital stock of the Company, then in each case the Exercise Price
shall be multiplied by a fraction of which the numerator shall be the number of shares of Common Stock (excluding treasury
shares, if any) outstanding immediately before such event and of which the denominator shall be the number of shares of Common
Stock outstanding immediately after such event, and the number of shares issuable upon exercise of this Warrant shall be proportionately
adjusted such that the aggregate Exercise Price of this Warrant shall remain unchanged.  Any adjustment made pursuant to this
Section 3(a) shall become effective immediately after the record date for the determination of stockholders entitled
to receive such dividend or distribution and shall become effective immediately after the effective date in the case of a subdivision,
combination or re-classification.

 

b)           
Subsequent Rights Offerings.  In addition to any adjustments pursuant to Section 3(a) above, if at any time
the Company grants, issues or sells any Common Stock Equivalents or rights to purchase stock, warrants, securities or other property
pro rata to the record holders of any class of shares of Common Stock (the “Purchase Rights”), then the Holder
will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder
could have acquired if the Holder had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant
(without regard to any limitations on exercise hereof, including without limitation, the Beneficial Ownership Limitation) immediately
before the date on which a record is taken for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken,
the date as of which the record holders of shares of Common Stock are to be determined for the grant, issue or sale of such Purchase
Rights (provided, however, that to the extent that the Holder’s right to participate in any such Purchase Right
would result in the Holder exceeding the Beneficial Ownership Limitation, then the Holder shall not be entitled to participate
in such Purchase Right to such extent (or beneficial ownership of such shares of Common Stock as a result of such Purchase Right
to such extent) and such Purchase Right to such extent shall be held in abeyance for the Holder until such time, if ever, as its
right thereto would not result in the Holder exceeding the Beneficial Ownership Limitation).

 

c)            
Pro Rata Distributions.  During such time as this Warrant is outstanding, if the Company shall declare or make any
dividend or other distribution (other than cash) of its assets (or rights to acquire its assets) to holders of shares of Common
Stock, by way of return of capital or otherwise (including, without limitation, any distribution of stock or other securities,
property or options by way of a dividend, spin off, reclassification, corporate rearrangement, scheme of arrangement or other similar
transaction) (a “Distribution”), at any time after the issuance of this Warrant, then, in each such case, the
Holder shall be entitled to participate in such Distribution to the same extent that the Holder would have participated therein
if the Holder had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to
any limitations on exercise hereof, including without limitation, the Beneficial Ownership Limitation) immediately before the date
of which a record is taken for such Distribution, or, if no such record is taken, the date as of which the record holders of shares
of Common Stock are to be determined for the participation in such Distribution (provided, however, that to the extent
that the Holder’s right to participate in any such Distribution would result in the Holder exceeding the Beneficial Ownership
Limitation, then the Holder shall not be entitled to participate in such Distribution to such extent (or in the beneficial ownership
of any shares of Common Stock as a result of such Distribution to such extent) and the portion of such Distribution shall be held
in abeyance for the benefit of the Holder until such time, if ever, as its right thereto would not result in the Holder exceeding
the Beneficial Ownership Limitation).

 

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d)            Fundamental
Transaction. If, at any time while this Warrant is outstanding, (i) the Company, directly or indirectly, in one or
more related transactions effects any merger or consolidation of the Company with or into another Person,
(ii) the Company, directly or indirectly, effects any sale, lease, license, assignment, transfer, conveyance or other
disposition of all or substantially all of its assets in one or a series of related transactions, (iii) any, direct or
indirect, purchase offer, tender offer or exchange offer (whether by the Company or another Person) is completed pursuant to
which holders of Common Stock are permitted to sell, tender or exchange their shares for other securities, cash or property
and has been accepted by the holders of 50% or more of the outstanding Common Stock, (iv) the Company, directly or
indirectly, in one or more related transactions effects any reclassification, reorganization or recapitalization of the
Common Stock or any compulsory share exchange pursuant to which the Common Stock is effectively converted into or exchanged
for other securities, cash or property, or (v) the Company, directly or indirectly, in one or more related transactions
consummates a stock or share purchase agreement or other business combination (including, without limitation, a
reorganization, recapitalization, spin-off, merger or scheme of arrangement) with another Person or group of Persons whereby
such other Person or group 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 or share purchase agreement or other business combination) (each a “Fundamental
Transaction”), then, upon any subsequent exercise of this Warrant, the Holder shall have the right to receive, for
each Warrant Share that would have been issuable upon such exercise immediately prior to the occurrence of such Fundamental
Transaction, at the option of the Holder (without regard to any limitation in Section 2(e) on the exercise of this
Warrant), the number of shares of Common Stock of the successor or acquiring corporation or of the Company, if it is the
surviving corporation, and any additional consideration (the “Alternate Consideration”) receivable as a
result of such Fundamental Transaction by a holder of the number of shares of Common Stock for which this Warrant is
exercisable immediately prior to such Fundamental Transaction (without regard to any limitation in Section 2(e) on
the exercise of this Warrant).  For purposes of any such exercise, the determination of the Exercise Price shall be
appropriately adjusted to apply to such Alternate Consideration based on the amount of Alternate Consideration issuable in
respect of one share of Common Stock in such Fundamental Transaction, and the Company shall apportion the Exercise Price
among the Alternate Consideration in a reasonable manner reflecting the relative value of any different components of the
Alternate Consideration.  If holders of Common Stock are given any choice as to the securities, cash or property to be
received in a Fundamental Transaction, then the Holder shall be given the same choice as to the Alternate Consideration it
receives upon any exercise of this Warrant following such Fundamental Transaction.

 

Notwithstanding anything to the contrary, in
the event of a Fundamental Transaction, the Company or any Successor Entity (as defined below) shall, at the Holder’s
option, exercisable at any time concurrently with, or within 30 days after, the consummation of the Fundamental Transaction
(or, if later, the date of the public announcement of the applicable Fundamental Transaction), purchase this Warrant from the
Holder by paying to the Holder an amount of cash equal to the Black Scholes Value (as defined below) of the remaining
unexercised portion of this Warrant on the date of the consummation of such Fundamental Transaction; provided, however,
if the Fundamental Transaction is not within the Company’s control, including not approved by the Company’s Board
of Directors, Holder shall only be entitled to receive from the Company or any Successor Entity, as of the date of
consummation of such Fundamental Transaction, the same type or form of consideration (and in the same proportion), at the
Black Scholes Value (as defined below) of the unexercised portion of this Warrant, that is being offered and paid to the
holders of Common Stock of the Company in connection with the Fundamental Transaction, whether that consideration be in the
form of cash, stock or any combination thereof, or whether the holders of Common Stock are given the choice to receive from
among alternative forms of consideration in connection with the Fundamental Transaction. “Black Scholes
Value” means the value of this Warrant based on the Black Scholes Option Pricing Model obtained from the
 “OV” function on Bloomberg, L.P. (“Bloomberg”) determined as of the day of consummation of the
applicable Fundamental Transaction for pricing purposes and reflecting (A) a risk-free interest rate corresponding to
the U.S. Treasury rate for a period equal to the time between the date of the public announcement of the applicable
Fundamental Transaction and the Termination Date, (B) an expected volatility equal to the remaining term of this Warrant
obtained from the HVT function on Bloomberg as of the Trading Day immediately prior to the public announcement of the
applicable Fundamental Transaction or, if the Fundamental Transaction is not publicly announced, the date the Fundamental
Transaction is consummated, (C) the underlying price per share used in such calculation shall be the greater of (i) the sum
of the price per share being offered in cash, if any, plus the value of any non-cash consideration, if any, being offered in
such Fundamental Transaction and (ii) the greater of (x) the last VWAP immediately prior to the public announcement of such
Fundamental Transaction and (y) the last VWAP immediately prior to the consummation of such Fundamental Transaction and (D) a
remaining option time equal to the time between the date of the public announcement of the applicable Fundamental Transaction
and the Termination Date. The payment of the Black Scholes Value will be made by wire transfer of immediately available funds
within five (5) Trading Days of the Holder’s election (or, if later, on the effective date of the Fundamental
Transaction). The Company shall cause any successor entity in a Fundamental Transaction in which the Company is not the
survivor (the “Successor Entity”) to assume in writing all of the obligations of the Company under this
Warrant in accordance with the provisions of this Section 3(e) pursuant to written agreements in form and substance
reasonably satisfactory to the Holder and approved by the Holder (without unreasonable delay) prior to such Fundamental
Transaction and shall, at the option of the Holder, deliver to the Holder in exchange for this Warrant a security of the
Successor Entity evidenced by a written instrument substantially similar in form and substance to this Warrant which is
exercisable for a corresponding number of shares of capital stock of such Successor Entity (or its parent entity)
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) prior to such Fundamental Transaction, and with an exercise price which applies
the exercise price hereunder to such shares of capital stock (but taking into account the relative value of the shares of
Common Stock pursuant to such Fundamental Transaction and the value of such shares of capital stock, such number of shares of
capital stock and such exercise price being for the purpose of protecting the economic value of this Warrant immediately
prior to the consummation of such Fundamental Transaction), and which is reasonably satisfactory in form and substance to the
Holder. Upon the occurrence of any such Fundamental Transaction, the Successor Entity shall succeed to, and be substituted
for (so that from and after the date of such Fundamental Transaction, the provisions of this Warrant referring to the
 “Company” shall refer instead to the Successor Entity), and may exercise every right and power of the Company and
shall assume all of the obligations of the Company under this Warrant with the same effect as if such Successor Entity had
been named as the Company herein.

 

    7

     

    

 

e)            
Calculations. All calculations under this Section 3 shall be made to the nearest cent or the nearest 1/100th of a share,
as the case may be. For purposes of this Section 3, the number of shares of Common Stock deemed to be issued and outstanding
as of a given date shall be the sum of the number of shares of Common Stock (excluding treasury shares, if any) issued and outstanding.

 

f)            
Notice to Holder.

 

i.                 
Adjustment to Exercise Price. Whenever the Exercise Price is adjusted pursuant to any provision of this Section 3,
the Company shall promptly deliver to the Holder by facsimile or email a notice setting forth the Exercise Price after such adjustment
and any resulting adjustment to the number of Warrant Shares and setting forth a brief statement of the facts requiring such adjustment.

 

ii.              
Notice to Allow Exercise by Holder. If (A) the Company shall declare a dividend (or any other distribution in whatever
form) on the Common Stock, (B) the Company shall declare a special nonrecurring cash dividend on or a redemption of the Common
Stock, (C) the Company shall authorize the granting to all holders of the Common Stock rights or warrants to subscribe for
or purchase any shares of capital stock of any class or of any rights, (D) the approval of any stockholders of the Company
shall be required in connection with any reclassification of the Common Stock, any consolidation or merger to which the Company
is a party, any sale or transfer of all or substantially all of the assets of the Company, or any compulsory share exchange whereby
the Common Stock is converted into other securities, cash or property, or (E) the Company shall authorize the voluntary or
involuntary dissolution, liquidation or winding up of the affairs of the Company, then, in each case, the Company shall cause to
be delivered by facsimile or email to the Holder at its last facsimile number or email address as it shall appear upon the Warrant
Register of the Company, at least 20 calendar days prior to the applicable record or effective date hereinafter specified, a notice
stating (x) the date on which a record is to be taken for the purpose of such dividend, distribution, redemption, rights or
warrants, or if a record is not to be taken, the date as of which the holders of the Common Stock of record to be entitled to such
dividend, distributions, redemption, rights or warrants are to be determined or (y) the date on which such reclassification,
consolidation, merger, sale, transfer or share exchange is expected to become effective or close, and the date as of which it is
expected that holders of the Common Stock of record shall be entitled to exchange their shares of the Common Stock for securities,
cash or other property deliverable upon such reclassification, consolidation, merger, sale, transfer or share exchange; provided
that the failure to deliver such notice or any defect therein or in the delivery thereof shall not affect the validity of the corporate
action required to be specified in such notice.  To the extent that any notice provided in this Warrant constitutes, or contains,
material, non-public information regarding the Company or any of its subsidiaries, the Company shall simultaneously file such notice
with the Commission pursuant to a Current Report on Form 8-K.  The Holder shall remain entitled to exercise this Warrant
during the period commencing on the date of such notice to the effective date of the event triggering such notice except as may
otherwise be expressly set forth herein.

 

    8

     

    

 

Section 4.             

Transfer of Warrant.

 

a)            
Transferability.  Pursuant to FINRA Rule 5110(g)(1), neither this Warrant nor any Warrant Shares issued upon exercise
of this Warrant shall be sold, transferred, assigned, pledged or hypothecated, or be the subject of any hedging, short sale, derivative,
put or call transaction that would result in the effective economic disposition of the securities by any person for a period of
180 days immediately following the date of effectiveness or commencement of sales of the offering pursuant to which this Warrant
is being issued, except the transfer of any security:

 

i.             by operation of law or by reason of reorganization of the Company;

 

ii.             to any FINRA member firm participating in the offering and the officers and partners thereof, if all securities so transferred
remain subject to the lock-up restriction in this Section 4(a) for the remainder of the time period;

 

iii.             if the aggregate amount of securities of the Company held by the Holder or related person do not exceed 1% of the securities being
offered;

 

iv.             that is beneficially owned on a pro-rata basis by all equity owners of an investment fund, provided that no participating member
manages or otherwise directs investments by the fund, and participating members in the aggregate do not own more than 10% of the
equity in the fund; or

 

v.             the exercise or conversion of any security, if all securities received remain subject to the lock-up restriction in this Section 4(a) for
the remainder of the time period.

 

Subject to the foregoing restriction,
this Warrant and all rights hereunder (including, without limitation, any registration rights) are transferable, in whole or in
part, upon surrender of this Warrant at the principal office of the Company or its designated agent, together with a written assignment
of this Warrant substantially in the form attached hereto duly executed by the Holder or its agent or attorney and funds sufficient
to pay any transfer taxes payable upon the making of such transfer.  Upon such surrender and, if required, such payment, the
Company shall execute and deliver a new Warrant or Warrants in the name of the assignee or assignees, as applicable, and in the
denomination or denominations specified in such instrument of assignment, and shall issue to the assignor a new Warrant evidencing
the portion of this Warrant not so assigned, and this Warrant shall promptly be cancelled.  Notwithstanding anything herein
to the contrary, the Holder shall not be required to physically surrender this Warrant to the Company unless the Holder has assigned
this Warrant in full, in which case, the Holder shall surrender this Warrant to the Company within three (3) Trading Days
of the date on which the Holder delivers an assignment form to the Company assigning this Warrant in full.  The Warrant, if
properly assigned in accordance herewith, may be exercised by a new holder for the purchase of Warrant Shares without having a
new Warrant issued.

 

b)             New Warrants. This Warrant may be divided or combined with other Warrants upon presentation hereof at the aforesaid office
of the Company, together with a written notice specifying the names and denominations in which new Warrants are to be issued, signed
by the Holder or its agent or attorney.  Subject to compliance with Section 4(a), as to any transfer which may be involved
in such division or combination, the Company shall execute and deliver a new Warrant or Warrants in exchange for the Warrant or
Warrants to be divided or combined in accordance with such notice. All Warrants issued on transfers or exchanges shall be dated
the Issue Date of this Warrant and shall be identical with this Warrant except as to the number of Warrant Shares issuable pursuant
thereto.

 

c)             Warrant Register. The Company shall register this Warrant, upon records to be maintained by the Company for that purpose
(the “Warrant Register”), in the name of the record Holder hereof from time to time.  The Company may deem
and treat the registered Holder of this Warrant as the absolute owner hereof for the purpose of any exercise hereof or any distribution
to the Holder, and for all other purposes, absent actual notice to the contrary.

 

    9

     

    

 

Section 5.             

Miscellaneous.

 

a)             No Rights as Stockholder Until Exercise; No Settlement in Cash.  This Warrant does not entitle the Holder to any voting
rights, dividends or other rights as a stockholder of the Company prior to the exercise hereof as set forth in Section 2(d)(i),
except as expressly set forth in Section 3.  Without limiting the rights of a Holder to receive Warrant Shares on
a “cashless exercise,” in no event will the Company be required to net cash settle an exercise of this Warrant.

 

b)             Loss, Theft, Destruction or Mutilation of Warrant. The Company covenants that upon receipt by the Company of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of this Warrant or any stock certificate relating to the Warrant
Shares, and in case of loss, theft or destruction, of indemnity or security reasonably satisfactory to it (which, in the case of
the Warrant, shall not include the posting of any bond), and upon surrender and cancellation of such Warrant or stock certificate,
if mutilated, the Company will make and deliver a new Warrant or stock certificate of like tenor and dated as of such cancellation,
in lieu of such Warrant or stock certificate.

 

c)             Saturdays, Sundays, Holidays, etc.  If the last or appointed day for the taking of any action or the expiration
of any right required or granted herein shall not be a Trading Day, then, such action may be taken or such right may be exercised
on the next succeeding Trading Day.

 

d)            Authorized Shares.

 

The Company covenants that, during
the period the Warrant is outstanding, it will reserve from its authorized and unissued Common Stock a sufficient number of shares
to provide for the issuance of the Warrant Shares upon the exercise of any purchase rights under this Warrant.  The Company
further covenants that its issuance of this Warrant shall constitute full authority to its officers who are charged with the duty
of issuing the necessary Warrant Shares upon the exercise of the purchase rights under this Warrant.  The Company will take
all such reasonable action as may be necessary to assure that such Warrant Shares may be issued as provided herein without violation
of any applicable law or regulation, or of any requirements of the Trading Market upon which the Common Stock may be listed. 
The Company covenants that all Warrant Shares which may be issued upon the exercise of the purchase rights represented by this
Warrant will, upon exercise of the purchase rights represented by this Warrant and payment for such Warrant Shares in accordance
herewith, be duly authorized, validly issued, fully paid and nonassessable and free from all taxes, liens and charges created by
the Company in respect of the issue thereof (other than taxes in respect of any transfer occurring contemporaneously with such
issue).

 

Except and to the extent as waived
or consented to by the Holder, the Company shall not by any action, including, without limitation, amending its certificate of
incorporation or through any reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale of securities
or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant, but will
at all times in good faith assist in the carrying out of all such terms and in the taking of all such actions as may be necessary
or appropriate to protect the rights of Holder as set forth in this Warrant against impairment.  Without limiting the generality
of the foregoing, the Company will (i) not increase the par value of any Warrant Shares above the amount payable therefor
upon such exercise immediately prior to such increase in par value, (ii) take all such action as may be necessary or appropriate
in order that the Company may validly and legally issue fully paid and nonassessable Warrant Shares upon the exercise of this Warrant
and (iii) use commercially reasonable efforts to obtain all such authorizations, exemptions or consents from any public regulatory
body having jurisdiction thereof, as may be, necessary to enable the Company to perform its obligations under this Warrant.

 

Before taking any action
which would result in an adjustment in the number of Warrant Shares for which this Warrant is exercisable or in the Exercise
Price, the Company shall obtain all such authorizations or exemptions thereof, or consents thereto, as may be necessary from
any public regulatory body or bodies having jurisdiction thereof.

 

    10

     

    

 

e)             Governing Law. All questions concerning the construction, validity, enforcement and interpretation of this Warrant shall
be governed by and construed and enforced in accordance with the internal laws of the State of New York, without regard to the
principles of conflicts of law thereof. Each party agrees that all legal proceedings concerning the interpretations, enforcement
and defense of the transactions contemplated by this Warrant (whether brought against a party hereto or their respective affiliates,
directors, officers, shareholders, partners, members, employees or agents) shall be commenced exclusively in the state and federal
courts sitting in the City of New York. Each party hereby irrevocably submits to the exclusive jurisdiction of the state and federal
courts sitting in the City of New York, Borough of Manhattan for the adjudication of any dispute hereunder or in connection herewith
or with any transaction contemplated hereby or discussed herein, and hereby irrevocably waives, and agrees not to assert in any
suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit,
action or proceeding is improper or is an inconvenient venue for such proceeding. Each party hereby irrevocably waives personal
service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof via registered
or certified mail or overnight delivery (with evidence of delivery) to such party at the address in effect for notices to it under
this Warrant and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained
herein shall be deemed to limit in any way any right to serve process in any other manner permitted by law. If either party shall
commence an action, suit or proceeding to enforce any provisions of this Warrant, the prevailing party in such action, suit or
proceeding shall be reimbursed by the other party for their reasonable attorneys’ fees and other costs and expenses incurred
with the investigation, preparation and prosecution of such action or proceeding.

 

f)             Restrictions.  The Holder acknowledges that the Warrant Shares acquired upon the exercise of this Warrant, if not registered,
and the Holder does not utilize cashless exercise, will have restrictions upon resale imposed by state and federal securities laws.

 

g)             Nonwaiver and Expenses.  No course of dealing or any delay or failure to exercise any right hereunder on the part of
Holder shall operate as a waiver of such right or otherwise prejudice the Holder’s rights, powers or remedies, notwithstanding
the fact that the right to exercise this Warrant terminates on the Termination Date.  Without limiting any other provision
of this Warrant, if the Company willfully and knowingly fails to comply with any provision of this Warrant, which results in any
material damages to the Holder, the Company shall pay to the Holder such amounts as shall be sufficient to cover any costs and
expenses including, but not limited to, reasonable attorneys’ fees, including those of appellate proceedings, incurred by
the Holder in collecting any amounts due pursuant hereto or in otherwise enforcing any of its rights, powers or remedies hereunder.

 

h)             Notices. 
Any and all notices or other communications or deliveries to be provided by the holders hereunder including, without limitation,
any Notice of Exercise, shall be in writing and delivered personally, by facsimile or e-mail, or sent by a nationally recognized
overnight courier service, addressed to the Company, at 375 Pheasant Run, Newtown, PA 18940, Attention: Mark Guerin, Chief Financial
Officer, email address: MGuerin@onconova.us, facsimile: (267) 759-3681, or such other facsimile number, email address or address
as the Company may specify for such purposes by notice to the Holders. Any and all notices or other communications or deliveries
to be provided by the Company hereunder shall be in writing and delivered personally, by facsimile or e-mail, or sent by a nationally
recognized overnight courier service addressed to each Holder at the facsimile number, e-mail address or address of such Holder
appearing on the books of the Company. Any notice or other communication or deliveries hereunder shall be deemed given and effective
on the earliest of (i) the time of transmission, if such notice or communication is delivered via facsimile at the facsimile
number or via e-mail at the e-mail address set forth in this Section prior to 5:30 p.m. (New York City time) on any
date, (ii) the next Trading Day after the date of transmission, if such notice or communication is delivered via facsimile
at the facsimile number or via e-mail at the e-mail address set forth in this Section on a day that is not a Trading Day
or later than 5:30 p.m. (New York City time) on any Trading Day, (iii) the second Trading Day following the date of
mailing, if sent by U.S. nationally recognized overnight courier service, or (iv) upon actual receipt by the party to whom
such notice is required to be given.

 

    11

     

    

 

i)            
Limitation of Liability.  No provision hereof, in the absence of any affirmative action by the Holder to exercise this
Warrant to purchase Warrant Shares, and no enumeration herein of the rights or privileges of the Holder, shall give rise to any
liability of the Holder for the purchase price of any Common Stock or as a stockholder of the Company, whether such liability is
asserted by the Company or by creditors of the Company.

 

j)             Remedies.  The Holder, in addition to being entitled to exercise all rights granted by law, including recovery of damages,
will be entitled to specific performance of its rights under this Warrant.  The Company agrees that monetary damages would
not be adequate compensation for any loss incurred by reason of a breach by it of the provisions of this Warrant and hereby agrees
to waive and not to assert the defense in any action for specific performance that a remedy at law would be adequate.

 

k)             Successors and Assigns.  Subject to applicable securities laws, this Warrant and the rights and obligations evidenced
hereby shall inure to the benefit of and be binding upon the successors and permitted assigns of the Company and the successors
and permitted assigns of Holder.  The provisions of this Warrant are intended to be for the benefit of any Holder from time
to time of this Warrant and shall be enforceable by the Holder or holder of Warrant Shares.

 

l)             Amendment.  This Warrant may be modified or amended or the provisions hereof waived with the written consent of the
Company and the Holder.

 

m)             Severability.  Wherever possible, each provision of this Warrant shall be interpreted in such manner as to be effective
and valid under applicable law, but if any provision of this Warrant shall be prohibited by or invalid under applicable law, such
provision shall be ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of such provisions
or the remaining provisions of this Warrant.

 

n)             Headings.  The headings used in this Warrant are for the convenience of reference only and shall not, for any purpose,
be deemed a part of this Warrant.

 

********************

 

(Signature Page Follows)

 

    12

     

    

 

IN WITNESS WHEREOF, the Company has caused
this Warrant to be executed by its officer thereunto duly authorized as of the date first above indicated.

 

	 	ONCONOVA THERAPEUTICS, INC.
	 	 	 
	 	By:  	          
                                
	 	 	Name:
	 	 	Title:

 

    13

     

    

 

NOTICE OF EXERCISE

 

TO:              
ONCONOVA THERAPEUTICS, INC.

 

(1)        
The undersigned hereby elects to purchase          Warrant Shares of the Company pursuant
to the terms of the attached Warrant (only if exercised in full), and tenders herewith payment of the exercise price in full, together
with all applicable transfer taxes, if any.

 

(2)        
Payment shall take the form of (check applicable box):

 

 ̈ in lawful
money of the United States; or

 

 ̈ if permitted
the cancellation of such number of Warrant Shares as is necessary, in accordance with the formula set forth in subsection 2(c),
to exercise this Warrant with respect to the maximum number of Warrant Shares purchasable pursuant to the cashless exercise procedure
set forth in subsection 2(c).

 

(3)        
Please issue said Warrant Shares in the name of the undersigned or in such other name as is specified below:

 

(4)        
The time of day this Notice of Exercise is being executed is:

 

The Warrant Shares shall be delivered to the following DWAC
Account Number:

 

[SIGNATURE OF HOLDER]

 

	Name of Investing Entity:	 
	Signature of Authorized Signatory of Investing Entity:	 
	Name of Authorized Signatory:	 
	Title of Authorized Signatory:	 
	Date:	 
	 	 	 	 

 

    14

     

    

 

EXHIBIT B

 

ASSIGNMENT FORM

 

(To assign the foregoing Warrant, execute
this form and supply required information.  Do not use this form to exercise the Warrant to purchase shares.)

 

FOR VALUE RECEIVED, the foregoing Warrant
and all rights evidenced thereby are hereby assigned to

 

	Name:	 	 
	 	 	(Please Print)
	 	 	 
	Address:	 	 
	 	 	(Please Print)
	 	 	 
	Phone Number:	 	 
	 	 	 
	Email Address:	 	 
	 	 	 
	Dated:                   ,	 	 
	 	 	 
	Holder’s Signature:	 	 	 
	 	 	 	 
	Holder’s Address:	 	 	 

 

    15Exhibit
10.1

 

SECURITIES
PURCHASE AGREEMENT

 

This Securities Purchase
Agreement (this “Agreement”) is dated as of November 21, 2019, between Onconova Therapeutics, Inc., a Delaware
corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its
successors and assigns, a “Purchaser” and collectively the “Purchasers”).

 

WHEREAS, subject to
the terms and conditions set forth in this Agreement and pursuant to an effective registration statement under the Securities Act
of 1933, as amended (the “Securities Act”), the Company desires to issue and sell to each Purchaser, and each
Purchaser, severally and not jointly, desires to purchase from the Company, securities of the Company as more fully described in
this Agreement.

 

NOW, THEREFORE, IN
CONSIDERATION of the mutual covenants contained in this Agreement, and for other good and valuable consideration the receipt and
adequacy of which are hereby acknowledged, the Company and each Purchaser agree as follows:

 

ARTICLE I.

DEFINITIONS

 

1.1           
 Definitions. In addition to the terms defined elsewhere in this Agreement, for all purposes of this Agreement, the
following terms have the meanings set forth in this Section 1.1:

 

“Acquiring Person”
shall have the meaning ascribed to such term in Section 4.5.

 

“Action”
shall have the meaning ascribed to such term in Section 3.1(j).

 

“Affiliate”
means any Person that, directly or indirectly through one or more intermediaries, controls or is controlled by or is under common
control with a Person as such terms are used in and construed under Rule 405 under the Securities Act.

 

“Board
of Directors” means the board of directors of the Company.

 

“Business
Day” means any day except any Saturday, any Sunday, any day which is a federal legal holiday in the United States or
any day on which banking institutions in the State of New York are authorized or required by law or other governmental action to
close.

 

“Class
A Units” means each Class A unit consisting of (a) one Share, and (b) one Series A Warrant to purchase one (1) Series
A Warrant Share(s).

 

“Class
A Unit Purchase Price” equals $0.20 per each Class A Unit, subject to adjustment for reverse and forward stock splits,
stock dividends, stock combinations and other similar transactions of the Common Stock that occur after the date of this Agreement
and prior to the Closing Date.

 

    

     

    

 

“Class
B Units” means each Class B unit consisting of (a) one Pre-Funded Warrant to initially purchase one Pre-Funded Warrant
Share, and (b) one Series A Warrant to purchase one (1) Series A Warrant Share(s).

 

“Class
B Unit Purchase Price” equals $0.1999 per each Class B Unit, subject to adjustment for reverse and forward stock splits,
stock dividends, stock combinations and other similar transactions of the Common Stock that occur after the date of this Agreement
and prior to the Closing Date.

 

“Closing”
means the closing of the purchase and sale of the Securities pursuant to Section 2.1.

 

“Closing
Date” means the Trading Day on which all of the Transaction Documents have been executed and delivered by the applicable
parties thereto, and all conditions precedent to (i) the Purchasers’ obligations to pay the Subscription Amount and (ii)
the Company’s obligations to deliver the Securities, in each case, have been satisfied or waived, but in no event later than
the second (2nd) Trading Day following the date hereof.

 

“Commission”
means the United States Securities and Exchange Commission.

 

“Common
Stock” means the common stock of the Company, par value $0.01 per share, and any other class of securities into which
such securities may hereafter be reclassified or changed.

 

“Common
Stock Equivalents” means any 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.

 

“Company
Counsel” means Morgan, Lewis & Bockius LLP, with offices located at 1701 Market Street, Philadelphia, PA 19103.

 

“Disclosure
Schedules” means the Disclosure Schedules of the Company delivered concurrently herewith.

 

“Disclosure
Time” means, (i) if this Agreement is signed on a day that is not a Trading Day or after 9:00 a.m. (New York City time)
and before midnight (New York City time) on any Trading Day, 9:01 a.m. (New York City time) on the Trading Day immediately following
the date hereof, unless otherwise instructed as to an earlier time by the Placement Agent, and (ii) if this Agreement is signed
between midnight (New York City time) and 9:00 a.m. (New York City time) on any Trading Day, no later than 9:01 a.m. (New York
City time) on the date hereof, unless otherwise instructed as to an earlier time by the Placement Agent.

 

“Evaluation
Date” shall have the meaning ascribed to such term in Section 3.1(s).

 

    2

     

    

 

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

 

“Exempt
Issuance” means the issuance of (a) shares of Common Stock or options to employees, officers or directors of the Company
pursuant to any stock or option plan duly adopted for such purpose, by a majority of the non-employee members of the Board of Directors
or a majority of the members of a committee of non-employee directors established for such purpose for services rendered to the
Company, (b) securities upon the exercise or exchange of or conversion of any Securities issued hereunder and/or other securities
exercisable or exchangeable for or convertible into shares of Common Stock issued and outstanding on the date of this Agreement,
provided that such securities have not been amended since the date of this Agreement to increase the number of such securities
or to decrease the exercise price, exchange price or conversion price of such securities (other than in connection with stock splits
or combinations) or to extend the term of such securities, and (c) securities issued pursuant to acquisitions or strategic transactions
approved by a majority of the disinterested directors of the Company, provided that such securities are issued as “restricted
securities” (as defined in Rule 144) and carry no registration rights that require or permit the filing of any registration
statement in connection therewith during the prohibition period in Section 4.12(a) herein, and provided that any such issuance
shall only be to a Person (or to the equityholders of a Person) which is, itself or through its subsidiaries, an operating company
or an owner of an asset in a business synergistic with the business of the Company and shall provide to the Company additional
benefits in addition to the investment of funds, but shall not include a transaction in which the Company is issuing securities
primarily for the purpose of raising capital or to an entity whose primary business is investing in securities and (d) up to $11,050,000.0
of Units, including the shares of Common Stock, Pre-Funded Warrants and Series A Warrants issued to other purchasers pursuant to
the Prospectus concurrently with the Closing at the applicable Class A Unit Purchase Price or Class B Unit Purchase Price, less
such aggregate dollar amount of Units sold pursuant to this Agreement.

 

“FCPA”
means the Foreign Corrupt Practices Act of 1977, as amended.

 

“FDA”
shall have the meaning ascribed to such term in Section 3.1(hh).

 

“FDCA”
shall have the meaning ascribed to such term in Section 3.1(hh).

 

“GAAP”
shall have the meaning ascribed to such term in Section 3.1(h).

 

“Indebtedness”
shall have the meaning ascribed to such term in Section 3.1(aa).

 

“Intellectual
Property Rights” shall have the meaning ascribed to such term in Section 3.1(p).

 

“Liens”
means a lien, charge, pledge, security interest, encumbrance, right of first refusal, preemptive right or other restriction.

 

    3

     

    

 

“Lock-Up
Agreement” means the Lock-Up Agreement, dated as of the date hereof, by and among the Company and the directors and officers,
in the form of Exhibit B attached hereto.

 

“Material
Adverse Effect” shall have the meaning assigned to such term in Section 3.1(b).

 

“Material
Permits” shall have the meaning ascribed to such term in Section 3.1(n).

 

“Person”
means an individual or corporation, partnership, trust, incorporated or unincorporated association, joint venture, limited liability
company, joint stock company, government (or an agency or subdivision thereof) or other entity of any kind.

 

“Pharmaceutical
Product” shall have the meaning ascribed to such term in Section 3.1(hh).

 

“Placement
Agent” means H.C. Wainwright & Co., LLC.

 

“Pre-Funded
Warrants” means, collectively, the Pre-Funded Common Stock purchase warrants delivered to the Purchasers at the Closing
in accordance with Section 2.2(a) hereof, which Pre-Funded Warrants shall be exercisable immediately and shall expire when exercised
in full, in the form of Exhibit A-2 attached hereto.

 

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

 

“Preliminary
Prospectus” means the preliminary prospectus dated November 21, 2019.

 

“Proceeding”
means an action, claim, suit, investigation or proceeding (including, without limitation, an informal investigation or partial
proceeding, such as a deposition), whether commenced or threatened.

 

“Prospectus”
means the final prospectus to be filed pursuant to the Registration Statement.

 

“Purchaser
Party” shall have the meaning ascribed to such term in Section 4.8.

 

“Registration
Statement” means the effective registration statement with Commission file No. 333-234360 which registers the sale of
the Shares, the Warrants and the Warrant Shares to the Purchasers, including all information, documents and exhibits filed with
or incorporated by reference into such registration statement.

 

“Required
Approvals” shall have the meaning ascribed to such term in Section 3.1(e).

 

“Rule
144” means Rule 144 promulgated by the Commission pursuant to the Securities Act, as such Rule may be amended or
interpreted from time to time, or any similar rule or regulation hereafter adopted by the Commission having substantially the
same purpose and effect as such Rule.

 

    4

     

    

 

“Rule
424” means Rule 424 promulgated by the Commission pursuant to the Securities Act, as such Rule may be amended or interpreted
from time to time, or any similar rule or regulation hereafter adopted by the Commission having substantially the same purpose
and effect as such Rule.

 

“SEC
Reports” shall have the meaning ascribed to such term in Section 3.1(h).

 

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

 

“Securities
Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

 

“Series
A Warrants” means, collectively, the Series A Common Stock purchase warrants delivered to the Purchasers at the Closing
in accordance with Section 2.2(a) hereof, which Series A Warrants shall be exercisable immediately upon issuance and have a term
of exercise equal to five (5) years following the initial exercise date, in the form of Exhibit A-1 attached hereto.

 

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

 

“Shares”
means the shares of Common Stock issued or issuable to each Purchaser pursuant to this Agreement.

 

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

 

“Subscription
Amount” means, as to each Purchaser, the aggregate amount to be paid for the Class A Units and/or Class B Units purchased
hereunder as specified below such Purchaser’s name on the signature page of this Agreement and next to the heading “Subscription
Amount,” in United States dollars and in immediately available funds.

 

“Subsidiary”
means any subsidiary of the Company as set forth in the SEC Reports, and shall, where applicable, also include any direct or indirect
subsidiary of the Company formed or acquired after the date hereof.

 

“Trading
Day” means a day on which the principal Trading Market is open for trading.

 

“Trading
Market” means any of the following markets or exchanges on which the Common Stock is listed or quoted for trading on
the date in question: the NYSE American, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market or
the New York Stock Exchange (or any successors to any of the foregoing).

 

    5

     

    

 

“Transaction
Documents” means this Agreement, the Warrants, all exhibits and schedules thereto and hereto and any other documents
or agreements executed in connection with the transactions contemplated hereunder.

 

“Transfer
Agent” means EQ Shareowner Services, the current transfer agent of the Company, with a mailing address of P.O. Box 64945,
St. Paul, MN 55164-0945 and any successor transfer agent of the Company.

 

“Units”
means, collectively, the Class A Units and the Class B Units.

 

“Variable
Rate Transaction” shall have the meaning ascribed to such term in Section 4.12(b).

 

“Warrants”
means, collectively, the Series A Warrants and the Pre-Funded Warrants.

 

“Warrant
Shares” means, collectively, the Series A Warrant Shares and the Pre-Funded Warrant Shares.

 

ARTICLE II.

PURCHASE AND SALE

 

2.1            
Closing. On the Closing Date, upon the terms and subject to the conditions set forth herein, the Company agrees
to sell, and the Purchasers, severally and not jointly, agree to purchase, up to an aggregate of $6.10 million of Class A Units
as determined pursuant to Section 2.2(a); provided, however, that, to the extent that a Purchaser determines, in its sole discretion,
that such Purchaser (together with such Purchaser’s Affiliates, and any Person acting as a group together with such purchaser
or any of such Holder’s Affiliates) would beneficially own in excess of the Beneficial Ownership Limitation, or as such
Purchaser may otherwise choose, in lieu of purchasing Class A Units such Purchaser may elect to purchase Class B Units at the
Class B Unit Purchase Price in lieu of Class A Units in such manner to result in the same aggregate purchase price being paid
by such Purchaser to the Company. The “Beneficial Ownership Limitation” shall be 4.99% (or, at the election of the
Purchaser, 9.99%) of the number of shares of the Common Stock outstanding immediately after giving effect to the issuance of the
Securities on the Closing Date. Each Purchaser’s Subscription Amount as set forth on the signature page hereto executed
by such Purchaser shall be made available for “Delivery Versus Payment” (“DVP”) settlement with
the Company or its designees. The Company shall deliver to each Purchaser its respective Shares or Pre-Funded Warrants (as applicable
to such Purchaser) and Series A Warrants as determined pursuant to Section 2.2(a), and the Company and each Purchaser shall deliver
the other items set forth in Section 2.2 deliverable at the Closing. Upon satisfaction of the covenants and conditions set forth
in Sections 2.2 and 2.3, the Closing shall occur at the offices of the Placement Agent or such other location as the parties shall
mutually agree. Each Purchaser acknowledges that, concurrently with the Closing and pursuant to the Prospectus, the Company may
sell up to $11.05 million of additional Units to purchasers not party to this Purchase Agreement, less such aggregate dollar amount
of Units sold pursuant to this Agreement and will issue to each such purchaser such additional shares of Common Stock and Series
A Warrants or Pre-Funded Warrants and Series A Warrants in the same form and at the same Class A Unit Purchase Price or Class
B Unit Purchase Price, as issued to a Purchaser hereunder. The Company covenants that, if the Purchaser delivers a Notice of Exercise
(as defined in the Pre-Funded Warrant) no later than 12:00 p.m. (New York City time) on the Closing Date to exercise any Pre-Funded
Warrants between the date hereof and the Closing Date, the Company shall deliver Pre-Funded Warrant Shares to the Purchaser on
the Closing Date in connection with such Notice of Exercise. Unless otherwise directed by the Placement Agent, settlement of the
Shares shall occur via DVP (i.e., on the Closing Date, the Company shall issue the Shares registered in the Purchasers’
names and addresses and released by the Transfer Agent directly to the account(s) at the Placement Agent identified by each Purchaser;
upon receipt of such Shares, the Placement Agent shall promptly electronically deliver such Shares to the applicable Purchaser,
and payment therefor shall be made by the Placement Agent (or its clearing firm) by wire transfer to the Company). Notwithstanding
anything to the contrary herein and the Purchaser’s Subscription Amount set forth on the signature pages attached hereto
(and as an alternative for purchasing Class B Units), the number of Class A Units purchased by a Purchaser (and its Affiliates)
hereunder shall not, when aggregated with all other shares of Common Stock owned by such Purchaser (and its Affiliates) at such
time, result in such Purchaser beneficially owning (as determined in accordance with Section 13(d) of the Exchange Act)
in excess of 9.9% of the then issued and outstanding shares of Common Stock outstanding at the Closing (the “Beneficial
Ownership Maximum”) and such Purchaser’s Subscription Amount, to the extent it would otherwise exceed the Beneficial
Ownership Maximum immediately prior to the Closing, shall be conditioned upon the issuance of Class A Units at the Closing to
the other Purchasers signatory hereto. To the extent that a Purchaser’s beneficial ownership of the Common Stock would otherwise
be deemed to exceed the Beneficial Ownership Maximum, such Purchasers’ Subscription Amount shall automatically be reduced
as necessary in order to comply with this paragraph.

 

    6

     

    

 

2.2            
Deliveries.

 

(a)              
On or prior to the Closing Date, the Company shall deliver or cause to be delivered to each Purchaser the following:

 

(i)               
this Agreement duly executed by the Company;

 

(ii)              
a legal opinion of Company Counsel, in a form reasonably acceptable to the Placement Agent and Purchasers;

 

(iii)             
The Lock-Up Agreements;

 

(iv)             
the Company shall have provided each Purchaser with the Company’s wire instructions, on Company letterhead and executed
by the Chief Executive Officer or Chief Financial Officer of the Company;

 

(v)               subject
to the last sentence of Section 2.1, a copy of the irrevocable instructions to the Transfer Agent instructing the Transfer
Agent to deliver on an expedited basis via The Depository Trust Company Deposit or Withdrawal at Custodian system
(“DWAC”) Shares equal to the portion of such Purchaser’s Subscription Amount applicable to Class A
Units divided by the Class A Unit Purchase Price, registered in the name of such Purchaser;

 

    7

     

    

 

(vi)            
for each Purchaser of Class B Units, a Pre-Funded Warrant registered in the name of such Purchaser to purchase up to a number
of shares of Common Stock equal to the portion of such Purchaser’s Subscription Amount applicable to Class B Units divided
by the Class B Unit Purchase Price, with an exercise price equal to $0.0001, subject to adjustment therein;

 

(vii)           
a Series A Warrant registered in the name of each such Purchaser to purchase up to a number of shares of Common Stock equal
to 100% of the aggregate number of Shares and the Pre-Funded Warrant Shares underlying the Pre-Funded Warrants initially issuable
on the date hereof, if any, purchased by such Purchaser with an exercise price equal to $0.20, subject to adjustment therein; and

 

(viii)          
the Prospectus (which may be delivered in accordance with Rule 172 under the Securities Act).

 

(b)              
On or prior to the Closing Date, each Purchaser shall deliver or cause to be delivered to the Company the following:

 

(i)              
this Agreement duly executed by such Purchaser; and

 

(ii)             
such Purchaser’s Subscription Amount with regard to the Pre-Funded Warrants purchased by such Purchaser, if any, by
wire transfer to the account specified by the Company in Section 2.2(a)(iii) above, or as otherwise agreed by the Company and the
Placement Agent; and

 

(iii)            
such Purchaser’s Subscription Amount with regard to the Shares purchased by such Purchaser, which shall be made available
for “Delivery Versus Payment” settlement with the Company or its designees.

 

2.3            
Closing Conditions.

 

(a)                The
obligations of the Company hereunder in connection with the Closing are subject to the following conditions being met:

 

(i)              
the accuracy in all material respects (or, to the extent representations or warranties are qualified by materiality or Material
Adverse Effect, in all respects) when made and on the Closing Date of the representations and warranties of the Purchasers contained
herein (unless as of a specific date therein in which case they shall be accurate as of such date);

 

(ii)             
all obligations, covenants and agreements of each Purchaser required to be performed at or prior to the Closing Date shall
have been performed; and

 

    8

     

    

 

(iii)            
the delivery by each Purchaser of the items set forth in Section 2.2(b) of this Agreement.

 

(b)              
The respective obligations of the Purchasers hereunder in connection with the Closing are subject to the following conditions
being met:

 

(i)              
the accuracy in all material respects (or, to the extent representations or warranties are qualified by materiality or Material
Adverse Effect, in all respects) when made and on the Closing Date of the representations and warranties of the Company contained
herein (unless as of a specific date therein in which case they shall be accurate as of such date);

 

(ii)             
all obligations, covenants and agreements of the Company required to be performed at or prior to the Closing Date shall
have been performed;

 

(iii)            
the delivery by the Company of the items set forth in Section 2.2(a) of this Agreement;

 

(iv)            
there shall have been no Material Adverse Effect with respect to the Company since the date hereof; and

 

(v)             
from the date hereof to the Closing Date, trading in the Common Stock shall not have been suspended by the Commission or
the Company’s principal Trading Market, and, at any time prior to the Closing Date, trading in securities generally as reported
by Bloomberg L.P. shall not have been suspended or limited, or minimum prices shall not have been established on securities whose
trades are reported by such service, or on any Trading Market, nor shall a banking moratorium have been declared either by the
United States or New York State authorities nor shall there have occurred any material outbreak or escalation of hostilities or
other national or international calamity of such magnitude in its effect on, or any material adverse change in, any financial market
which, in each case, in the reasonable judgment of such Purchaser, makes it impracticable or inadvisable to purchase the Securities
at the Closing.

 

ARTICLE III.

REPRESENTATIONS AND WARRANTIES

 

3.1            
Representations and Warranties of the Company. Except as set forth in the Disclosure Schedules, which Disclosure
Schedules shall be deemed a part hereof and shall qualify any representation or otherwise made herein to the extent of the disclosure
contained in the corresponding section of the Disclosure Schedules, the Company hereby makes the following representations and
warranties to each Purchaser:

 

(a)               Subsidiaries.
All of the direct and indirect subsidiaries of the Company are set forth in the SEC Reports. The Company owns, directly or
indirectly, all of the capital stock or other equity interests of each Subsidiary free and clear of any Liens, and all of the
issued and outstanding shares of capital stock of each Subsidiary are validly issued and are fully paid, non-assessable and
free of preemptive and similar rights to subscribe for or purchase securities. If the Company has no subsidiaries, all
other references to the Subsidiaries or any of them in the Transaction Documents shall be disregarded.

 

    9

     

    

 

(b)              
Organization and Qualification. The Company and each of the Subsidiaries is an entity duly incorporated or otherwise
organized, validly existing and in good standing under the laws of the jurisdiction of its incorporation or organization, with
the requisite power and authority to own and use its properties and assets and to carry on its business as currently conducted.
Neither the Company nor any Subsidiary is in violation nor default of any of the provisions of its respective certificate or articles
of incorporation, bylaws or other organizational or charter documents. Each of the Company and the Subsidiaries is duly qualified
to conduct business and is in good standing as a foreign corporation or other entity in each jurisdiction in which the nature of
the business conducted or property owned by it makes such qualification necessary, except where the failure to be so qualified
or in good standing, as the case may be, could not have or reasonably be expected to result in: (i) a material adverse effect on
the legality, validity or enforceability of any Transaction Document, (ii) a material adverse effect on the results of operations,
assets, business or condition (financial or otherwise) of the Company and the Subsidiaries, taken as a whole, or (iii) a material
adverse effect on the Company’s ability to perform in any material respect on a timely basis its obligations under any Transaction
Document (any of (i), (ii) or (iii), a “Material Adverse Effect”) and no Proceeding has been instituted in any
such jurisdiction revoking, limiting or curtailing or seeking to revoke, limit or curtail such power and authority or qualification.

 

(c)              
Authorization; Enforcement. The Company has the requisite corporate power and authority to enter into and to consummate
the transactions contemplated by this Agreement and each of the other Transaction Documents and otherwise to carry out its obligations
hereunder and thereunder. The execution and delivery of this Agreement and each of the other Transaction Documents by the Company
and the consummation by it of the transactions contemplated hereby and thereby have been duly authorized by all necessary action
on the part of the Company and no further action is required by the Company, the Board of Directors or the Company’s stockholders
in connection herewith or therewith other than in connection with the Required Approvals. This Agreement and each other Transaction
Document to which it is a party has been (or upon delivery will have been) duly executed by the Company and, when delivered in
accordance with the terms hereof and thereof, will constitute the valid and binding obligation of the Company enforceable against
the Company in accordance with its 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.

 

(d)               No
Conflicts. The execution, delivery and performance by the Company of this Agreement and the other Transaction Documents
to which it is a party, the issuance and sale of the Securities and the consummation by it of the transactions
contemplated hereby and thereby do not and will not (i) conflict with or violate any provision of the Company’s or any
Subsidiary’s certificate or articles of incorporation, bylaws or other organizational or charter documents, 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 upon any of the properties or assets of the Company or any Subsidiary, or give to others
any rights of termination, amendment, anti-dilution or similar adjustments, acceleration or cancellation (with or without
notice, lapse of time or both) of, any agreement, credit facility, debt or other instrument (evidencing a Company or
Subsidiary debt or otherwise) or other understanding to which the Company or any Subsidiary is a party or by which any
property or asset of the Company or any Subsidiary is bound or affected, or (iii) subject to the Required Approvals, conflict
with or result in a violation of any law, rule, regulation, order, judgment, injunction, decree or other restriction of any
court or governmental authority to which the Company or a Subsidiary is subject (including federal and state securities laws
and regulations), or by which any property or asset of the Company or a Subsidiary is bound or affected; except in the case
of each of clauses (ii) and (iii), such as could not have or reasonably be expected to result in a Material Adverse
Effect.

 

    10

     

    

 

(e)              
Filings, Consents and Approvals. The Company is not required to obtain any consent, waiver, authorization or order
of, give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental
authority or other Person in connection with the execution, delivery and performance by the Company of the Transaction Documents,
other than: (i) the filings required pursuant to Section 4.4 of this Agreement, (ii) the filing with the Commission of the Prospectus,
(iii) application(s) to each applicable Trading Market for the listing of the Shares and Warrant Shares for trading thereon in
the time and manner required thereby, and (iv) such filings as are required to be made under applicable state securities laws (collectively,
the “Required Approvals”).

 

(f)                Issuance
of the Securities; Registration. The Securities are duly authorized and, when issued and paid for in accordance with the
applicable Transaction Documents, will be duly and validly issued, fully paid and nonassessable, free and clear of all Liens
imposed by the Company. The Warrant Shares, when issued in accordance with the terms of the Warrants, will be validly
issued, fully paid and nonassessable, free and clear of all Liens imposed by the Company. The Company has reserved from its
duly authorized capital stock the maximum number of shares of Common Stock issuable pursuant to this Agreement and the
Warrants. The Company has prepared and filed the Registration Statement in conformity with the requirements of the Securities
Act, which became effective on November 21, 2019 (the “Effective Date”), including the Prospectus,
and such amendments and supplements thereto as may have been required to the date of this Agreement. The Registration
Statement is effective under the Securities Act and no stop order preventing or suspending the effectiveness of the
Registration Statement or suspending or preventing the use of each of the Preliminary Prospectus or the Prospectus has been
issued by the Commission and no proceedings for that purpose have been instituted or, to the knowledge of the Company, are
threatened by the Commission. The Company, if required by the rules and regulations of the Commission, shall file the
Prospectus with the Commission pursuant to Rule 424(b). At the time the Registration Statement and any amendments thereto
became effective, at the date of this Agreement and at the Closing Date, the Registration Statement and any amendments
thereto conformed and will conform in all material respects to the requirements of the Securities Act and did not and will
not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or
necessary to make the statements therein not misleading; and the Prospectus and any amendments or supplements thereto, at the
time the Preliminary Prospectus and the Prospectus or any amendment or supplement thereto was issued and at the Closing Date,
conformed and will conform in all material respects to the requirements of the Securities Act and did not and will not
contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were made, not misleading.

 

    11

     

    

 

(g)               Capitalization.
The capitalization of the Company as of the date hereof is as set forth on Schedule 3.1(g). The Company has not issued
any capital stock since its most recently filed periodic report under the Exchange Act, other than pursuant to the exercise
of employee stock options under the Company’s stock option plans, the issuance of shares of Common Stock to employees
pursuant to the Company’s employee stock purchase plans and pursuant to the conversion and/or exercise of Common Stock
Equivalents outstanding as of the date of the most recently filed periodic report under the Exchange Act. No Person has any
right of first refusal, preemptive right, right of participation, or any similar right to participate in the
transactions contemplated by the Transaction Documents. Except as a result of the purchase and sale of the Securities, there
are no outstanding options, warrants, scrip rights to subscribe to, calls or commitments of any character whatsoever relating
to, or securities, rights or obligations convertible into or exercisable or exchangeable for, or giving any Person any right
to subscribe for or acquire, any shares of Common Stock or the capital stock of any Subsidiary, or contracts, commitments,
understandings or arrangements by which the Company or any Subsidiary is or may become bound to issue additional shares of
Common Stock or Common Stock Equivalents or capital stock of any Subsidiary. The issuance and sale of the Securities will not
obligate the Company or any Subsidiary to issue shares of Common Stock or other securities to any Person (other than the
Purchasers). There are no outstanding securities or instruments of the Company or any Subsidiary with any provision that
adjusts the exercise, conversion, exchange or reset price of such security or instrument upon an issuance of securities by
the Company or any Subsidiary. There are no outstanding securities or instruments of the Company or any Subsidiary that
contain any redemption or similar provisions, and there are no contracts, commitments, understandings or arrangements by
which the Company or any Subsidiary is or may become bound to redeem a security of the Company or such Subsidiary. The
Company does not have any stock appreciation rights or “phantom stock” plans or agreements or any similar plan or
agreement. All of the outstanding shares of capital stock of the Company are duly authorized, validly issued, fully paid and
nonassessable, have been issued in compliance with all federal and state securities laws, and none of such outstanding shares
was issued in violation of any preemptive rights or similar rights to subscribe for or purchase securities. No further
approval or authorization of any stockholder, the Board of Directors or others is required for the issuance and sale of the
Securities. There are no stockholders agreements, voting agreements or other similar agreements with respect to the
Company’s capital stock to which the Company is a party or, to the knowledge of the Company, between or among any of
the Company’s stockholders.

 

    12

     

    

 

(h)              
SEC Reports; Financial Statements. The Company has filed all reports, schedules, forms, statements and other documents
required to be filed by the Company under the Securities Act and the Exchange Act, including pursuant to Section 13(a) or 15(d)
thereof, for the two years preceding the date hereof (or such shorter period as the Company was required by law or regulation to
file such material) (the foregoing materials, including the exhibits thereto and documents incorporated by reference therein, together
with the Preliminary Prospectus and the Prospectus, being collectively referred to herein as the “SEC Reports”)
on a timely basis or has received a valid extension of such time of filing and has filed any such SEC Reports prior to the expiration
of any such extension. As of their respective dates, the SEC Reports complied in all material respects with the requirements of
the Securities Act and the Exchange Act, as applicable, and none of the SEC Reports, when filed, contained any untrue statement
of a material fact or omitted to state a material fact required to be stated therein or necessary in order to make the statements
therein, in the light of the circumstances under which they were made, not misleading. The Company has never been an issuer subject
to Rule 144(i) under the Securities Act. The financial statements of the Company included in the SEC Reports comply in all material
respects with applicable accounting requirements and the rules and regulations of the Commission with respect thereto as in effect
at the time of filing. Such financial statements have been prepared in accordance with United States generally accepted accounting
principles applied on a consistent basis during the periods involved (“GAAP”), except as may be otherwise specified
in such financial statements or the notes thereto and except that unaudited financial statements may not contain all footnotes
required by GAAP, and fairly present in all material respects the financial position of the Company and its consolidated Subsidiaries
as of and for the dates thereof and the results of operations and cash flows for the periods then ended, subject, in the case of
unaudited statements, to normal, immaterial, year-end audit adjustments.

 

(i)                 Material
Changes; Undisclosed Events, Liabilities or Developments. Since the date of the latest audited financial statements
included within the SEC Reports, except as set forth on Schedule 3.1(i), (i) there has been no event, occurrence or
development that has had or that could reasonably be expected to result in a Material Adverse Effect, (ii) the Company
has not incurred any liabilities (contingent or otherwise) other than (A) trade payables and accrued expenses incurred in the
ordinary course of business consistent with past practice and (B) liabilities not required to be reflected in the
Company’s financial statements pursuant to GAAP or disclosed in filings made with the Commission, (iii) the Company has
not altered its method of accounting, (iv) the Company has not declared or made any dividend or distribution of cash or other
property to its stockholders or purchased, redeemed or made any agreements to purchase or redeem any shares of its capital
stock and (v) the Company has not issued any equity securities to any officer, director or Affiliate, except pursuant to
existing Company stock option plans. The Company does not have pending before the Commission any request for confidential
treatment of information. Except for the issuance of the Securities contemplated by this Agreement or as set forth in the SEC
Reports, no event, liability, fact, circumstance, occurrence or development has occurred or exists or is reasonably expected
to occur or exist with respect to the Company or its Subsidiaries or their respective businesses, prospects, properties,
operations, assets or financial condition that would be required to be disclosed by the Company under applicable securities
laws at the time this representation is made or deemed made that has not been publicly disclosed at least 1 Trading Day prior
to the date that this representation is made.

 

    13

     

    

 

(j)                
Litigation. There is no action, suit, inquiry, notice of violation, proceeding or investigation pending or, to the
knowledge of the Company, threatened against or affecting the Company, any Subsidiary or any of their respective properties before
or by any court, arbitrator, governmental or administrative agency or regulatory authority (federal, state, county, local or foreign)
(collectively, an “Action”) which (i) adversely affects or challenges the legality, validity or enforceability
of any of the Transaction Documents or the Securities or (ii) could, if there were an unfavorable decision, have or reasonably
be expected to result in a Material Adverse Effect. Neither the Company nor any Subsidiary, nor any director or officer thereof,
is or has been the subject of any Action involving a claim of violation of or liability under federal or state securities laws
or a claim of breach of fiduciary duty. There has not been, and to the knowledge of the Company, there is not pending or contemplated,
any investigation by the Commission involving the Company or any current or former director or officer of the Company. The Commission
has not issued any stop order or other order suspending the effectiveness of any registration statement filed by the Company or
any Subsidiary under the Exchange Act or the Securities Act.

 

(k)              
Labor Relations. No labor dispute exists or, to the knowledge of the Company, is imminent with respect to any of
the employees of the Company, which could reasonably be expected to result in a Material Adverse Effect. None of the Company’s
or its Subsidiaries’ employees is a member of a union that relates to such employee’s relationship with the Company
or such Subsidiary, and neither the Company nor any of its Subsidiaries is a party to a collective bargaining agreement, and the
Company and its Subsidiaries believe that their relationships with their employees are good. To the knowledge of the Company, no
executive officer of the Company or any Subsidiary, is, or is now expected to be, in violation of any material term of any employment
contract, confidentiality, disclosure or proprietary information agreement or non-competition agreement, or any other contract
or agreement or any restrictive covenant in favor of any third party, and the continued employment of each such executive officer
does not subject the Company or any of its Subsidiaries to any liability with respect to any of the foregoing matters. The Company
and its Subsidiaries are in compliance with all U.S. federal, state, local and foreign laws and regulations relating to employment
and employment practices, terms and conditions of employment and wages and hours, except where the failure to be in compliance
could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

 

(l)                 Compliance.
Neither the Company nor any Subsidiary: (i) is 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 or any Subsidiary under),
nor has the Company or any Subsidiary 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) is in violation of any
judgment, decree or order of any court, arbitrator or other governmental authority or (iii) is or has been 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 could not have or reasonably be expected to result in a Material
Adverse Effect.

 

    14

     

    

 

(m)            
Environmental Laws.The Company and its Subsidiaries (i) are in compliance with all federal, state, local and
foreign laws relating to pollution or protection of human health or the environment (including ambient air, surface water, groundwater,
land surface or subsurface strata), including laws relating to emissions, discharges, releases or threatened releases of chemicals,
pollutants, contaminants, or toxic or hazardous substances or wastes (collectively, “Hazardous Materials”) into
the environment, or otherwise relating to the manufacture, processing, distribution, use, treatment, storage, disposal, transport
or handling of Hazardous Materials, as well as all authorizations, codes, decrees, demands, or demand letters, injunctions, judgments,
licenses, notices or notice letters, orders, permits, plans or regulations, issued, entered, promulgated or approved thereunder
(“Environmental Laws”); (ii) have received all permits licenses or other approvals required of them under applicable
Environmental Laws to conduct their respective businesses; and (iii) are in compliance with all terms and conditions of any such
permit, license or approval where in each clause (i), (ii) and (iii), the failure to so comply could be reasonably expected to
have, individually or in the aggregate, a Material Adverse Effect.

 

(n)              
Regulatory Permits. The Company and the Subsidiaries possess all certificates, authorizations and permits issued
by the appropriate federal, state, local or foreign regulatory authorities necessary to conduct their respective businesses as
described in the SEC Reports, except where the failure to possess such permits could not reasonably be expected to result in a
Material Adverse Effect (“Material Permits”), and neither the Company nor any Subsidiary has received any notice
of proceedings relating to the revocation or modification of any Material Permit.

 

(o)              
Title to Assets. The Company and the Subsidiaries have good and marketable title in fee simple to all real property
owned by them and good and marketable title in all personal property owned by them that is material to the business of the Company
and the Subsidiaries, in each case free and clear of all Liens, except for (i) Liens as do not materially affect the value of such
property and do not materially interfere with the use made and proposed to be made of such property by the Company and the Subsidiaries,
and (ii) Liens for the payment of federal, state or other taxes, for which appropriate reserves have been made therefor in accordance
with GAAP and, the payment of which is neither delinquent nor subject to penalties. Any real property and facilities held under
lease by the Company and the Subsidiaries are held by them under valid, subsisting and enforceable leases with which the Company
and the Subsidiaries are in compliance.

 

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(p)              
Intellectual Property. The Company and the Subsidiaries have, or have rights to use, all patents, patent applications,
trademarks, trademark applications, service marks, trade names, trade secrets, inventions, copyrights, licenses and other intellectual
property rights and similar rights necessary or required for use in connection with their respective businesses as described in
the SEC Reports and which the failure to so have could have a Material Adverse Effect (collectively, the “Intellectual
Property Rights”). None of, and neither the Company nor any Subsidiary has received a notice (written or otherwise) that
any of, the Intellectual Property Rights has expired, terminated or been abandoned, or is expected to expire or terminate or be
abandoned, within two (2) years from the date of this Agreement. Neither the Company nor any Subsidiary has received, since the
date of the latest audited financial statements included within the SEC Reports, a written notice of a claim or otherwise has any
knowledge that the Intellectual Property Rights violate or infringe upon the rights of any Person, except as could not have or
reasonably be expected to not have a Material Adverse Effect. To the knowledge of the Company, all such Intellectual Property Rights
are enforceable and there is no existing infringement by another Person of any of the Intellectual Property Rights. The Company
and its Subsidiaries have taken reasonable security measures to protect the secrecy, confidentiality and value of all of their
intellectual properties, except where failure to do so could not, individually or in the aggregate, reasonably be expected to have
a Material Adverse Effect. The Company has no knowledge of any facts that would preclude it from having valid license rights or
clear title to the Intellectual Property Rights. The Company has no knowledge that it lacks or will be unable to obtain any rights
or licenses to use all Intellectual Property Rights that are necessary to conduct its business.

 

(q)              
Insurance. The Company and the Subsidiaries are insured by insurers of recognized financial responsibility against
such losses and risks and in such amounts as are prudent and customary in the businesses in which the Company and the Subsidiaries
are engaged, including, but not limited to, directors and officers insurance coverage at least equal to the aggregate Subscription
Amount. Neither the Company nor any Subsidiary has any reason to believe that it will not be able to renew its existing insurance
coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to continue
its business without a significant increase in cost.

 

(r)                Transactions
With Affiliates and Employees. Except as set forth on Schedule 3.1(r),, none of the officers or directors of the
Company or any Subsidiary and, to the knowledge of the Company, none of the employees of the Company or any Subsidiary is
presently a party to any transaction with the Company or any Subsidiary (other than for services as employees, officers and
directors), including any contract, agreement or other arrangement providing for the furnishing of services to or by,
providing for rental of real or personal property to or from, providing for the borrowing of money from or lending of money
to or otherwise requiring payments to or from any officer, director or such employee or, to the knowledge of the Company, any
entity in which any officer, director, or any such employee has a substantial interest or is an officer, director, trustee,
stockholder, member or partner, in each case in excess of $120,000 other than for (i) payment of salary or consulting fees
for services rendered, (ii) reimbursement for expenses incurred on behalf of the Company and (iii) other employee benefits,
including stock option agreements under any stock option plan of the Company.

 

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(s)               
Sarbanes-Oxley; Internal Accounting Controls. The Company and the Subsidiaries are in compliance with any and all
applicable requirements of the Sarbanes-Oxley Act of 2002 that are effective as of the date hereof, and any and all applicable
rules and regulations promulgated by the Commission thereunder that are effective as of the date hereof and as of the Closing Date.
The Company and the Subsidiaries maintain 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 accountability, (iii)
access to assets is permitted only in accordance with management’s general or specific authorization, and (iv) the recorded
accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect
to any differences. The Company and the Subsidiaries have established disclosure controls and procedures (as defined in Exchange
Act Rules 13a-15(e) and 15d-15(e)) for the Company and the Subsidiaries and designed such disclosure controls and procedures to
ensure that information required to be disclosed by the Company in the reports it files or submits under the Exchange Act is recorded,
processed, summarized and reported, within the time periods specified in the Commission’s rules and forms. The Company’s
certifying officers have evaluated the effectiveness of the disclosure controls and procedures of the Company and the Subsidiaries
as of the end of the period covered by the most recently filed periodic report under the Exchange Act (such date, the “Evaluation
Date”). The Company presented in its most recently filed periodic report under the Exchange 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 Evaluation Date, there have been no changes in the internal control over financial reporting (as such term is defined
in the Exchange Act) of the Company and its Subsidiaries that have materially affected, or is reasonably likely to materially affect,
the internal control over financial reporting of the Company and its Subsidiaries.

 

(t)                
Certain Fees. Except as set forth in the Preliminary Prospectus and the Prospectus, no brokerage or finder’s
fees or commissions are or will be payable by the Company or any Subsidiary to any broker, financial advisor or consultant, finder,
placement agent, investment banker, bank or other Person with respect to the transactions contemplated by the Transaction Documents.
The Purchasers shall have no obligation with respect to any fees or with respect to any claims made by or on behalf of other Persons
for fees of a type contemplated in this Section that may be due in connection with the transactions contemplated by the Transaction
Documents.

 

(u)              
Investment Company. The Company is not, and is not an Affiliate of, and immediately after receipt of payment for
the Securities, will not be or be an Affiliate of, an “investment company” within the meaning of the Investment Company
Act of 1940, as amended. The Company shall conduct its business in a manner so that it will not become an “investment company”
subject to registration under the Investment Company Act of 1940, as amended.

 

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(v)              
Registration Rights. No Person has any right to cause the Company or any Subsidiary to effect the registration under
the Securities Act of any securities of the Company or any Subsidiary.

 

(w)             
Listing and Maintenance Requirements. The Common Stock is registered pursuant to Section 12(b) or 12(g) of the Exchange
Act, and the Company has taken no action designed to, or which to its knowledge is likely to have the effect of, terminating the
registration of the Common Stock under the Exchange Act nor has the Company received any notification that the Commission is contemplating
terminating such registration. Except as disclosed in the SEC Reports, the Company has not, in the 12 months preceding the date
hereof, received notice from any Trading Market on which the Common Stock is or has been listed or quoted to the effect that the
Company is not in compliance with the listing or maintenance requirements of such Trading Market. The Common Stock is currently
eligible for electronic transfer through the Depository Trust Company or another established clearing corporation and the Company
is current in payment of the fees to the Depository Trust Company (or such other established clearing corporation) in connection
with such electronic transfer.

 

(x)              
Application of Takeover Protections. The Company and the Board of Directors 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 certificate of incorporation (or similar
charter documents) or the laws of its state of incorporation that is or could become applicable to the Purchasers as a result of
the Purchasers and the Company fulfilling their obligations or exercising their rights under the Transaction Documents, including
without limitation as a result of the Company’s issuance of the Securities and the Purchasers’ ownership of the Securities.

 

(y)               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 any other Person acting on its behalf has provided any of the Purchasers or their agents
or counsel with any information that it believes constitutes or might constitute material, non-public information which is
not otherwise disclosed in the Prospectus. The Company understands and confirms that the Purchasers will rely on
the foregoing representation in effecting transactions in securities of the Company. All of the disclosure furnished by or on
behalf of the Company to the Purchasers regarding the Company and its Subsidiaries, their respective businesses and the
transactions contemplated hereby, including the Disclosure Schedules to this Agreement, is true and correct and does not
contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements
made therein, in the light of the circumstances under which they were made, not misleading. The press releases disseminated
by the Company during the twelve months preceding the date of this Agreement taken as a whole do not contain any untrue
statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were made and when made, not misleading. The Company
acknowledges and agrees that no Purchaser makes or has made any representations or warranties with respect to the
transactions contemplated hereby other than those specifically set forth in Section 3.2 hereof.

 

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(z)              
No Integrated Offering. Assuming the accuracy of the Purchasers’ representations and warranties set forth in
Section 3.2, neither the Company, nor any of its Affiliates, nor any Person acting on its or their behalf has, directly or indirectly,
made any offers or sales of any security or solicited any offers to buy any security, under circumstances that would cause this
offering of the Securities to be integrated with prior offerings by the Company for purposes of any applicable shareholder approval
provisions of any Trading Market on which any of the securities of the Company are listed or designated.

 

(aa)            
Solvency. Based on the consolidated financial condition of the Company as of the Closing Date, after giving effect
to the receipt by the Company of the proceeds from the sale of the Securities hereunder, (i) the fair saleable value of the Company’s
assets exceeds the amount that will be required to be paid on or in respect of the Company’s existing debts and other liabilities
(including known contingent liabilities) as they mature, (ii) the Company’s assets do not constitute unreasonably small capital
to carry on its business as now conducted and as proposed to be conducted including its capital needs taking into account the particular
capital requirements of the business conducted by the Company, consolidated and projected capital requirements and capital availability
thereof, and (iii) the current cash flow of the Company, together with the proceeds the Company would receive, were it to liquidate
all of its assets, after taking into account all anticipated uses of the cash, would be sufficient to pay all amounts on or in
respect of its liabilities when such amounts are required to be paid. The Company does not intend to incur debts beyond its ability
to pay such debts as they mature (taking into account the timing and amounts of cash to be payable on or in respect of its debt).
The Company has no knowledge of any facts or circumstances which lead it to believe that it will file for reorganization or liquidation
under the bankruptcy or reorganization laws of any jurisdiction within one year from the Closing Date. The SEC Reports set
forth as of the date hereof all outstanding secured and unsecured Indebtedness of the Company or any Subsidiary, or for which the
Company or any Subsidiary has commitments. For the purposes of this Agreement, “Indebtedness” means (x) any
liabilities for borrowed money or amounts owed in excess of $50,000 (other than trade accounts payable incurred in the ordinary
course of business), (y) all guaranties, endorsements and other contingent obligations in respect of indebtedness of others, whether
or not the same are or should be reflected in the Company’s consolidated balance sheet (or the notes thereto), except guaranties
by endorsement of negotiable instruments for deposit or collection or similar transactions in the ordinary course of business;
and (z) the present value of any lease payments in excess of $50,000 due under leases required to be capitalized in accordance
with GAAP. Neither the Company nor any Subsidiary is in default with respect to any Indebtedness.

 

(bb)            Tax
Status. Except for matters that would not, individually or in the aggregate, have or reasonably be expected to result in
a Material Adverse Effect, the Company and its Subsidiaries each (i) has made or filed all United States federal,state and
local income and all foreign income and franchise tax returns, reports and declarations required by any jurisdiction to
which it is subject, (ii) has paid all taxes and other governmental assessments and charges that are material in amount,
shown or determined to be due on such returns, reports and declarations and (iii) has set aside on its books provision
reasonably adequate for the payment of all material taxes for periods subsequent to the periods to which such returns,
reports or declarations apply. There are no unpaid taxes in any material amount claimed to be due by the taxing authority of
any jurisdiction, and the officers of the Company or of any Subsidiary know of no basis for any such claim.

 

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(cc)           
Foreign Corrupt Practices. Neither the Company nor any Subsidiary, nor to the knowledge of the Company or any Subsidiary,
any agent or other person acting on behalf of the Company or any Subsidiary, 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 any Subsidiary (or made
by any person acting on its behalf of which the Company is aware) which is in violation of law, or (iv) violated in any material
respect any provision of FCPA.

 

(dd)          
Accountants. The Company’s independent registered public accounting firm is Ernst & Young LLP. To
the knowledge and belief of the Company, such accounting firm (i) is a registered public accounting firm as required by the Exchange
Act and (ii) shall express its opinion with respect to the financial statements to be included in the Company’s Annual Report
for the fiscal year ending December 31, 2019.

 

(ee)           
 Acknowledgment Regarding Purchasers’ Purchase of Securities. The Company acknowledges and agrees that each
of the Purchasers is acting solely in the capacity of an arm’s length purchaser with respect to the Transaction Documents
and the transactions contemplated thereby. The Company further acknowledges that no Purchaser 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 Purchaser or any of their respective representatives or agents in connection with the Transaction
Documents and the transactions contemplated thereby is merely incidental to the Purchasers’ purchase of the Securities. The
Company further represents to each Purchaser 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.

 

(ff)              Acknowledgment
Regarding Purchaser’s Trading Activity. Anything in this Agreement or elsewhere herein to the contrary
notwithstanding (except for Sections 3.2(e) and 4.14 hereof), it is understood and acknowledged by the Company that: (i) none
of the Purchasers has been asked by the Company to agree, nor has any Purchaser agreed, to desist from purchasing or selling,
long and/or short, securities of the Company, or “derivative” securities based on securities issued by the
Company or to hold the Securities for any specified term; (ii) past or future open market or other transactions by any
Purchaser, specifically including, without limitation, Short Sales or “derivative” transactions, before or after
the closing of this or future private placement transactions, may negatively impact the market price of the
Company’s publicly-traded securities; (iii) any Purchaser, and counter-parties in “derivative” transactions
to which any such Purchaser is a party, directly or indirectly, presently may have a “short” position in the
Common Stock, and (iv) each Purchaser shall not be deemed to have any affiliation with or control over any arm’s length
counter-party in any “derivative” transaction. The Company further understands and acknowledges that (y) one or
more Purchasers may engage in hedging activities at various times during the period that the Securities are outstanding,
including, without limitation, during the periods that the value of the Warrant Shares deliverable with respect to Securities
are being determined, and (z) such hedging activities (if any) could reduce the value of the existing stockholders' equity
interests in the Company at and after the time that the hedging activities are being conducted. The Company acknowledges that
such aforementioned hedging activities do not constitute a breach of any of the Transaction Documents.

 

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(gg)          
Regulation M Compliance.  The Company has not, and to its knowledge no one acting on its behalf has, (i) 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, (ii) sold, bid for, purchased, or, paid any compensation
for soliciting purchases of, any of the Securities, or (iii) paid or agreed to pay to any Person any compensation for soliciting
another to purchase any other securities of the Company, other than, in the case of clauses (ii) and (iii), compensation paid to
the Company’s placement agent in connection with the placement of the Securities.

 

(hh)           FDA.
As to each product subject to the jurisdiction of the U.S. Food and Drug Administration (“FDA”) under the
Federal Food, Drug and Cosmetic Act, as amended, and the regulations thereunder (“FDCA”) that
is manufactured, packaged, labeled, tested, distributed, sold, and/or marketed by the Company or any of its Subsidiaries
(each such product, a “Pharmaceutical Product”), such Pharmaceutical Product is being manufactured,
packaged, labeled, tested, distributed, sold and/or marketed by the Company in compliance with all applicable requirements
under FDCA and similar laws, rules and regulations relating to registration, investigational use, premarket clearance,
licensure, or application approval, good manufacturing practices, good laboratory practices, good clinical practices, product
listing, quotas, labeling, advertising, record keeping and filing of reports, except where the failure to be in compliance
would not have a Material Adverse Effect. There is no pending, completed or, to the Company's knowledge, threatened, action
(including any lawsuit, arbitration, or legal or administrative or regulatory proceeding, charge, complaint, or
investigation) against the Company or any of its Subsidiaries, and none of the Company or any of its Subsidiaries has
received any notice, warning letter or other communication from the FDA or any other governmental entity, which (i) contests
the premarket clearance, licensure, registration, or approval of, the uses of, the distribution of, the manufacturing or
packaging of, the testing of, the sale of, or the labeling and promotion of any Pharmaceutical Product, (ii) withdraws its
approval of, requests the recall, suspension, or seizure of, or withdraws or orders the withdrawal of advertising or sales
promotional materials relating to, any Pharmaceutical Product, (iii) imposes a clinical hold on any clinical investigation by
the Company or any of its Subsidiaries, (iv) enjoins production at any facility of the Company or any of its
Subsidiaries, (v) enters or proposes to enter into a consent decree of permanent injunction with the Company or any of its
Subsidiaries, or (vi) otherwise alleges any violation of any laws, rules or regulations by the Company or any of its
Subsidiaries, and which, either individually or in the aggregate, would have a Material Adverse Effect. 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.  The Company has not been informed by the FDA that the FDA will
prohibit the marketing, sale, license or use in the United States of any product proposed to be developed, produced or
marketed by the Company nor has the FDA expressed any concern as to approving or clearing for marketing any product being
developed or proposed to be developed by the Company.

 

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(ii)             
Stock Option Plans. Each stock option granted by the Company under the Company’s stock option plan was granted
(i) in accordance with the terms of the Company’s stock option plan and (ii) with an exercise price at least equal to the
fair market value of the Common Stock on the date such stock option would be considered granted under GAAP and applicable law.
No stock option granted under the Company’s stock option plan has been backdated. The Company has not knowingly granted,
and there is no and has been no Company policy or practice to knowingly grant, stock options prior to, or otherwise knowingly coordinate
the grant of stock options with, the release or other public announcement of material information regarding the Company or its
Subsidiaries or their financial results or prospects.

 

(jj)             
Office of Foreign Assets Control. Neither the Company nor any Subsidiary nor, to the Company's knowledge, any director,
officer, agent, employee or affiliate of the Company or any Subsidiary is currently subject to any U.S. sanctions administered
by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”).

 

(kk)           
U.S. Real Property Holding Corporation. The Company is not and has never been a U.S. real property holding corporation
within the meaning of Section 897 of the Internal Revenue Code of 1986, as amended, and the Company shall so certify upon Purchaser’s
request.

 

(ll)             
Bank Holding Company Act. Neither the Company nor any of its Subsidiaries or Affiliates is subject to the Bank Holding
Company Act of 1956, as amended (the “BHCA”) and to regulation by the Board of Governors of the Federal Reserve
System (the “Federal Reserve”). Neither the Company nor any of its Subsidiaries or Affiliates owns or controls,
directly or indirectly, five percent (5%) or more of the outstanding shares of any class of voting securities or twenty-five percent
or more of the total equity of a bank or any entity that is subject to the BHCA and to regulation by the Federal Reserve. Neither
the Company nor any of its Subsidiaries or Affiliates exercises a controlling influence over the management or policies of a bank
or any entity that is subject to the BHCA and to regulation by the Federal Reserve.

 

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(mm)         
Money Laundering. The operations of the Company and its Subsidiaries are and have been conducted at all times in
compliance with applicable financial record-keeping and reporting requirements of the Currency and Foreign Transactions Reporting
Act of 1970, as amended, applicable money laundering statutes and applicable rules and regulations thereunder (collectively, the
 “Money Laundering Laws”), and no Action or Proceeding by or before any court or governmental agency, authority
or body or any arbitrator involving the Company or any Subsidiary with respect to the Money Laundering Laws is pending or, to the
knowledge of the Company or any Subsidiary, threatened.

 

3.2            
Representations and Warranties of the Purchasers. Each Purchaser, for itself and for no other Purchaser, hereby represents
and warrants as of the date hereof and as of the Closing Date to the Company as follows (unless as of a specific date therein,
in which case they shall be accurate as of such date):

 

(a)              
Organization; Authority. Such Purchaser is either an individual or an entity duly incorporated or formed, validly
existing and in good standing under the laws of the jurisdiction of its incorporation or formation with full right, corporate,
partnership, limited liability company or similar power and authority to enter into and to consummate the transactions contemplated
by the Transaction Documents and otherwise to carry out its obligations hereunder and thereunder. The execution and delivery of
the Transaction Documents and performance by such Purchaser of the transactions contemplated by the Transaction Documents have
been duly authorized by all necessary corporate, partnership, limited liability company or similar action, as applicable, on the
part of such Purchaser. Each Transaction Document to which it is a party has been duly executed by such Purchaser, and when delivered
by such Purchaser in accordance with the terms hereof, will constitute the valid and legally binding obligation of such Purchaser,
enforceable against it in accordance with its 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.

 

(b)              Understandings
or Arrangements. Such Purchaser is acquiring the Securities as principal for its own account and has no direct or indirect
arrangement or understandings with any other persons to distribute or regarding the distribution of such Securities (this representation
and warranty not limiting such Purchaser’s right to sell the Securities pursuant to the Registration Statement or otherwise
in compliance with applicable federal and state securities laws). Such Purchaser is acquiring the Securities hereunder in the ordinary
course of its business.

 

(c)               Purchaser
Status. At the time such Purchaser was offered the Securities, it was, and as of the date hereof it is, and on each date on
which it exercises any Warrants, it will be either: (i) an “accredited investor” as defined in Rule 501(a)(1), (a)(2),
(a)(3), (a)(7) or (a)(8) under the Securities Act or (ii) a “qualified institutional buyer” as defined in Rule 144A(a)
under the Securities Act.

 

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(d)               Experience
of Such Purchaser. Such Purchaser, either alone or together with its representatives, has such knowledge, sophistication and
experience in business and financial matters so as to be capable of evaluating the merits and risks of the prospective investment
in the Securities, and has so evaluated the merits and risks of such investment. Such Purchaser is able to bear the economic risk
of an investment in the Securities and, at the present time, is able to afford a complete loss of such investment.

 

(e)               Access
to Information. Such Purchaser acknowledges that it has had the opportunity to review the Transaction Documents (including
all exhibits and schedules thereto) and the SEC Reports and has been afforded, (i) the opportunity to ask such questions as it
has deemed necessary of, and to receive answers from, representatives of the Company concerning the terms and conditions of the
offering of the Securities and the merits and risks of investing in the Securities; (ii) access to information about the Company
and its financial condition, results of operations, business, properties, management and prospects sufficient to enable it to evaluate
its investment; and (iii) the opportunity to obtain such additional information that the Company possesses or can acquire without
unreasonable effort or expense that is necessary to make an informed investment decision with respect to the investment. Such Purchaser
acknowledges and agrees that neither the Placement Agent nor any Affiliate of the Placement Agent has provided such Purchaser with
any information or advice with respect to the Securities nor is such information or advice necessary or desired. Neither the Placement
Agent nor any Affiliate has made or makes any representation as to the Company or the quality of the Securities and the Placement
Agent and any Affiliate may have acquired non-public information with respect to the Company which such Purchaser agrees need not
be provided to it. In connection with the issuance of the Securities to such Purchaser, neither the Placement Agent nor any of
its Affiliates has acted as a financial advisor or fiduciary to such Purchaser.

 

(f)               
Certain Transactions and Confidentiality. Other than consummating the transactions contemplated hereunder, such
Purchaser has not, nor has any Person acting on behalf of or pursuant to any understanding with such Purchaser, 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 Purchaser first received a term sheet (written or oral) from the Company or any other Person representing
the Company setting forth the material terms of the transactions contemplated hereunder and ending immediately prior to the execution
hereof. Notwithstanding the foregoing, in the case of a Purchaser that is a multi-managed investment vehicle whereby separate
portfolio managers manage separate portions of such Purchaser’s assets and the portfolio managers have no direct knowledge
of the investment decisions made by the portfolio managers managing other portions of such Purchaser’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. Other than to other Persons party to this Agreement or to such
Purchaser’s representatives, including, without limitation, its officers, directors, partners, legal and other advisors,
employees, agents and Affiliates, such Purchaser has 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 the avoidance
of doubt, nothing contained herein shall constitute a representation or warranty, or preclude any actions, with respect to locating
or borrowing shares in order to effect Short Sales or similar transactions in the future.

 

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The Company acknowledges
and agrees that the representations contained in this Section 3.2 shall not modify, amend or affect such Purchaser’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. Notwithstanding the foregoing, for the avoidance of doubt,
nothing contained herein shall constitute a representation or warranty, or preclude any actions, with respect to locating or borrowing
shares in order to effect Short Sales or similar transactions in the future.

 

ARTICLE IV.

OTHER AGREEMENTS OF THE PARTIES

 

4.1 
            Warrant Shares. If all or any portion of a Warrant is exercised at a time when there is an effective registration
statement to cover the issuance or resale of the Warrant Shares or if the Warrant is exercised via cashless exercise, the Warrant
Shares issued pursuant to any such exercise shall be issued free of all legends. If at any time following the date hereof the
Registration Statement (or any subsequent registration statement registering the sale or resale of the Warrant Shares) is not
effective or is not otherwise available for the sale or resale of the Warrant Shares, the Company shall immediately notify the
holders of the Warrants in writing that such registration statement is not then effective and thereafter shall promptly notify
such holders when the registration statement is effective again and available for the sale or resale of the Warrant Shares (it
being understood and agreed that the foregoing shall not limit the ability of the Company to issue, or any Purchaser to sell,
any of the Warrant Shares in compliance with applicable federal and state securities laws). The Company shall use best efforts
to keep a registration statement (including the Registration Statement) registering the issuance or resale of the Warrant Shares
effective during the term of the Warrants.

 

4.2            
Furnishing of Information.

 

(a)              
Until the earlier of the time that (i) no Purchaser owns Securities and (ii) the Warrants have expired, the Company covenants
to timely file (or obtain extensions in respect thereof and file within the applicable grace period) all reports required to be
filed by the Company after the date hereof pursuant to the Exchange Act even if the Company is not then subject to the reporting
requirements of the Exchange Act.

 

4.3             
Integration. The Company shall not sell, offer for sale or solicit offers to buy or otherwise negotiate in respect
of any security (as defined in Section 2 of the Securities Act) that would be integrated with the offer or sale of the Securities
for purposes of the rules and regulations of any Trading Market such that it would require shareholder approval prior to the closing
of such other transaction unless shareholder approval is obtained before the closing of such subsequent transaction.

 

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4.4             Securities Laws Disclosure; Publicity. The Company shall (a) by the Disclosure Time, issue a press release disclosing
the material terms of the transactions contemplated hereby, and (b) file a Current Report on Form 8-K, including the Transaction
Documents as exhibits thereto, with the Commission within the time required by the Exchange Act. From and after the issuance of
such press release, the Company represents to the Purchasers that it shall have publicly disclosed all material, non-public information
delivered to any of the Purchasers by the Company or any of its Subsidiaries, or any of their respective officers, directors, employees
or agents in connection with the transactions contemplated by the Transaction Documents. In addition, effective upon the issuance
of such press release, the Company acknowledges and agrees that any and all confidentiality or similar obligations under any agreement,
whether written or oral, between the Company, any of its Subsidiaries or any of their respective officers, directors, agents, employees
or Affiliates on the one hand, and any of the Purchasers or any of their Affiliates on the other hand, shall terminate. The Company
and each Purchaser shall consult with each other in issuing any other press releases with respect to the transactions contemplated
hereby, and neither the Company nor any Purchaser shall issue any such press release nor otherwise make any such public statement
without the prior consent of the Company, with respect to any press release of any Purchaser, or without the prior consent of each
Purchaser, with respect to any press release of the Company, which consent shall not unreasonably be withheld or delayed, except
if such disclosure is required by law, in which case the disclosing party shall promptly provide the other party with prior notice
of such public statement or communication. Notwithstanding the foregoing, the Company shall not publicly disclose the name of any
Purchaser, or include the name of any Purchaser in any filing with the Commission or any regulatory agency or Trading Market, without
the prior written consent of such Purchaser, except (a) as required by federal securities law in connection with the filing of
final Transaction Documents with the Commission and (b) to the extent such disclosure is required by law or Trading Market regulations,
in which case the Company shall provide the Purchasers with prior notice of such disclosure permitted under this clause (b).

 

4.5            
Shareholder Rights Plan. No claim will be made or enforced by the Company or, with the consent of the Company, any
other Person, that any Purchaser is an “Acquiring Person” under any control share acquisition, business combination,
poison pill (including any distribution under a rights agreement) or similar anti-takeover plan or arrangement in effect or hereafter
adopted by the Company, or that any Purchaser could be deemed to trigger the provisions of any such plan or arrangement, by virtue
of receiving Securities under the Transaction Documents or under any other agreement between the Company and the Purchasers.

 

4.6           
Non-Public Information. Except with respect to the material terms and conditions of the transactions contemplated
by the Transaction Documents, which shall be disclosed pursuant to Section 4.4, the Company covenants and agrees that neither
it, nor any other Person acting on its behalf will provide any Purchaser or its agents or counsel with any information that constitutes,
or the Company reasonably believes constitutes, material non-public information, unless prior thereto such Purchaser shall have
consented to the receipt of such information and agreed with the Company to keep such information confidential. The Company understands
and confirms that each Purchaser shall be relying on the foregoing covenant in effecting transactions in securities of the Company.
To the extent that the Company delivers any material, non-public information to a Purchaser without such Purchaser’s consent,
the Company hereby covenants and agrees that such Purchaser shall not have any duty of confidentiality to the Company, any of
its Subsidiaries, or any of their respective officers, directors, agents, employees or Affiliates, or a duty to the Company, any
of its Subsidiaries or any of their respective officers, directors, agents, employees or Affiliates not to trade on the basis
of, such material, non-public information, provided that the Purchaser shall remain subject to applicable law. To the extent that
any notice provided pursuant to any Transaction Document constitutes, or contains, material, non-public information regarding
the Company or any Subsidiaries, the Company shall simultaneously file such notice with the Commission pursuant to a Current Report
on Form 8-K. The Company understands and confirms that each Purchaser shall be relying on the foregoing covenant in effecting
transactions in securities of the Company.

 

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4.7            
Use of Proceeds. Except as set forth in the Preliminary Prospectus and the Prospectus, the Company shall use the
net proceeds from the sale of the Securities hereunder for working capital purposes and shall not use such proceeds: (a) for the
satisfaction of any portion of the Company’s debt (other than payment of trade payables in the ordinary course of the Company’s
business and prior practices), (b) for the redemption of any Common Stock or Common Stock Equivalents, (c) for the settlement of
any outstanding litigation or (d) in violation of FCPA or OFAC regulations.

 

4.8             Indemnification
of Purchasers. Subject to the provisions of this Section 4.8, the Company will indemnify and hold each Purchaser and its
directors, officers, shareholders, members, partners, employees and agents (and any other Persons with a functionally
equivalent role of a Person holding such titles notwithstanding a lack of such title or any other title), each Person who
controls such Purchaser (within the meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the
directors, officers, shareholders, agents, members, partners or employees (and any other Persons with a functionally
equivalent role of a Person holding such titles notwithstanding a lack of such title or any other title) of such controlling
persons (each, a “Purchaser Party”) harmless from any and all losses, liabilities, obligations, claims,
contingencies, damages, costs and expenses, including all judgments, amounts paid in settlements, court costs and reasonable
attorneys’ fees and costs of investigation that any such Purchaser Party may suffer or incur as a result of or relating
to (a) any breach of any of the representations, warranties, covenants or agreements made by the Company in this Agreement or
in the other Transaction Documents or (b) any action instituted against the Purchaser Parties in any capacity, or any of them
or their respective Affiliates, by any stockholder of the Company who is not an Affiliate of such Purchaser Party, with
respect to any of the transactions contemplated by the Transaction Documents (unless such action is solely based upon a
material breach of such Purchaser Party’s representations, warranties or covenants under the Transaction Documents or
any agreements or understandings such Purchaser Party may have with any such stockholder or any violations by such Purchaser
Party of state or federal securities laws or any conduct by such Purchaser Party which is finally judicially determined to
constitute fraud, gross negligence or willful misconduct). If any action shall be brought against any Purchaser Party in
respect of which indemnity may be sought pursuant to this Agreement, such Purchaser Party shall promptly notify the Company
in writing, and the Company shall have the right to assume the defense thereof with counsel of its own choosing reasonably
acceptable to the Purchaser Party. Any Purchaser Party shall have the right to employ separate counsel in any such action and
participate in the defense thereof, but the fees and expenses of such counsel shall be at the expense of such Purchaser Party
except to the extent that (x) the employment thereof has been specifically authorized by the Company in writing, (y) the
Company has failed after a reasonable period of time to assume such defense and to employ counsel or (z) in such action there
is, in the reasonable opinion of counsel, a material conflict on any material issue between the position of the Company and
the position of such Purchaser Party, in which case the Company shall be responsible for the reasonable fees and expenses of
no more than one such separate counsel. The Company will not be liable to any Purchaser Party under this Agreement (1)
for any settlement by a Purchaser Party effected without the Company’s prior written consent, which shall not be
unreasonably withheld or delayed; or (2) to the extent, but only to the extent that a loss, claim, damage or liability is
attributable to any Purchaser Party’s breach of any of the representations, warranties, covenants or agreements made by
such Purchaser Party in this Agreement or in the other Transaction Documents. The indemnification required by this Section
4.8 shall be made by periodic payments of the amount thereof during the course of the investigation or defense, as and when
bills are received or are incurred. The indemnity agreements contained herein shall be in addition to any cause of action or
similar right of any Purchaser Party against the Company or others and any liabilities the Company may be subject to pursuant
to law.

 

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4.9           
Reservation of Common Stock. As of the date hereof, the Company has reserved and the Company shall continue to reserve
and keep available at all times, free of preemptive rights, a sufficient number of shares of Common Stock for the purpose of enabling
the Company to issue Shares pursuant to this Agreement and Warrant Shares pursuant to any exercise of the Warrants.

 

4.10          
Listing of Common Stock. The Company hereby agrees to use commercially reasonable to maintain the listing or quotation
of the Common Stock on the Trading Market on which it is currently listed, and concurrently with the Closing, the Company shall
apply to list or quote all of the Shares and Warrant Shares on such Trading Market and promptly secure the listing of all of the
Shares and Warrant Shares on such Trading Market. The Company further agrees, if the Company applies to have the Common Stock traded
on any other Trading Market, it will then include in such application all of the Shares and Warrant Shares, and will take such
other action as is necessary to cause all of the Shares and Warrant Shares to be listed or quoted on such other Trading Market
as promptly as possible. The Company will then take all action reasonably necessary to continue the listing and trading of its
Common Stock on a Trading Market and will comply in all respects with the Company’s reporting, filing and other obligations
under the bylaws or rules of the Trading Market. The Company agrees to maintain the eligibility of the Common Stock for electronic
transfer through the Depository Trust Company or another established clearing corporation, including, without limitation, by timely
payment of fees to the Depository Trust Company or such other established clearing corporation in connection with such electronic
transfer.

 

4.11          
Reserved.

 

4.12          
Subsequent Equity Sales.

 

(a)              
From the date hereof until 90 days after the Closing Date, 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 Common Stock Equivalents.

 

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(b)              
From the date hereof until the first (1st) year anniversary of the Closing Date, the Company shall be prohibited from effecting
or entering into an agreement to effect any issuance by the Company or any of its Subsidiaries of Common Stock or Common Stock
Equivalents (or a combination of units thereof) involving a Variable Rate Transaction. “Variable Rate Transaction”
means a transaction in which the Company (i) issues or sells any debt or equity securities that are convertible into, exchangeable
or exercisable for, or include the right to receive additional shares of Common Stock either (A) at a conversion price, exercise
price or exchange rate or other price that is based upon and/or varies with the trading prices of or quotations for the shares
of Common Stock at any time after the initial issuance of such debt or equity securities, or (B) with a conversion, exercise or
exchange price that is subject to being reset at some future date after the initial issuance of such debt or equity security or
upon the occurrence of specified or contingent events directly or indirectly related to the business of the Company or the market
for the Common Stock or (ii) enters into, or effects a transaction under, any agreement, including, but not limited to, an equity
line of credit, whereby the Company may issue securities at a future determined price. Any Purchaser shall be entitled to obtain
injunctive relief against the Company to preclude any such issuance, which remedy shall be in addition to any right to collect
damages.

 

(c)              
Notwithstanding the foregoing, this Section 4.12 shall not apply in respect of an Exempt Issuance, except that no Variable
Rate Transaction shall be an Exempt Issuance.

 

4.13         
Equal Treatment of Purchasers. No consideration (including any modification of this Agreement) shall be offered or
paid to any Person to amend or consent to a waiver or modification of any provision of this Agreement unless the same consideration
is also offered to all of the parties to this Agreement. For clarification purposes, this provision constitutes a separate right
granted to each Purchaser by the Company and negotiated separately by each Purchaser, and is intended for the Company to treat
the Purchasers as a class and shall not in any way be construed as the Purchasers acting in concert or as a group with respect
to the purchase, disposition or voting of Securities or otherwise.

 

4.14          Certain
Transactions and Confidentiality. Each Purchaser, severally and not jointly with the other Purchasers, covenants that
neither it nor any Affiliate acting on its behalf or pursuant to any understanding with it will execute any purchases
or sales, including Short Sales of any of the Company’s securities during the period commencing with the execution of
this Agreement and ending at such time that the transactions contemplated by this Agreement are first publicly announced
pursuant to the initial press release as described in Section 4.4.  Each
Purchaser, severally and not jointly with the other Purchasers, covenants that until such time as the transactions
contemplated by this Agreement are publicly disclosed by the Company pursuant to the initial press release as described in
Section 4.4, such Purchaser will maintain the confidentiality of the existence and terms of this transaction and the
information included in the Disclosure Schedules.  Notwithstanding the foregoing, and
notwithstanding anything contained in this Agreement to the contrary, the Company expressly acknowledges and agrees that (i)
no Purchaser makes any representation, warranty or covenant hereby that it will not engage in effecting transactions in any
securities of the Company after the time that the transactions contemplated by this Agreement are first publicly announced
pursuant to the initial press release as described in Section 4.4, (ii) no Purchaser shall be restricted or prohibited from
effecting any transactions in any securities of the Company in accordance with applicable securities laws from and after the
time that the transactions contemplated by this Agreement are first publicly announced pursuant to the initial press release
as described in Section 4.4 and (iii) no Purchaser shall have any duty of confidentiality or duty not to trade in the
securities of the Company to the Company or its Subsidiaries after the issuance of the initial press release as described in
Section 4.4.  Notwithstanding the foregoing, in the case of a Purchaser that is a multi-managed investment vehicle
whereby separate portfolio managers manage separate portions of such Purchaser’s assets and the portfolio managers have
no direct knowledge of the investment decisions made by the portfolio managers managing other portions of such
Purchaser’s assets, the covenant 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.

 

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4.15         
Capital Changes. Until the one year anniversary of the Closing Date, the Company shall not undertake a reverse or
forward stock split or reclassification of the Common Stock without the prior written consent of the Purchasers holding a majority
in interest of the Shares.

 

4.16         
Lock-Up Agreements. The Company shall enforce the terms of the Lock-Up Agreements and not agree to any amendment
to, or modification of, the Lock-Up Agreements absent the prior written consent of the Placement Agent.

 

4.17         
Exercise Procedures. The form of Notice of Exercise included in the Warrants set forth the totality of the procedures
required of the Purchasers in order to exercise the Warrants. No additional legal opinion, other information or instructions shall
be required of the Purchasers to exercise their Warrants. Without limiting the preceding sentences, no ink-original Notice of Exercise
shall be required, nor shall any medallion guarantee (or other type of guarantee or notarization) of any Notice of Exercise form
be required in order to exercise the Warrants. The Company shall honor exercises of the Warrants and shall deliver Warrant Shares
in accordance with the terms, conditions and time periods set forth in the Transaction Documents.

 

ARTICLE V.

MISCELLANEOUS

 

5.1           
Termination.  This Agreement may be terminated by any Purchaser, as to such Purchaser’s obligations hereunder
only and without any effect whatsoever on the obligations between the Company and the other Purchasers, by written notice to the
other parties, if the Closing has not been consummated on or before the fifth (5th) Trading Day following the date hereof;
provided, however, that no such termination will affect the right of any party to sue for any breach by any other
party (or parties).

 

5.2 
            Fees and Expenses. Except as expressly set forth in the Transaction Documents to the contrary, each party shall
pay the fees and expenses of its advisers, counsel, accountants and other experts, if any, and all other expenses incurred by
such party incident to the negotiation, preparation, execution, delivery and performance of this Agreement. The Company shall
pay all Transfer Agent fees (including, without limitation, any fees required for same-day processing of any instruction letter
delivered by the Company and any exercise notice delivered by a Purchaser), stamp taxes and other taxes and duties levied in connection
with the delivery of any Securities to the Purchasers.

 

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5.3 
           Entire Agreement. The Transaction Documents, together with the exhibits and schedules thereto, the Preliminary Prospectus
and the Prospectus, contain the entire understanding of the parties with respect to the subject matter hereof and thereof and supersede
all prior agreements and understandings, oral or written, with respect to such matters, which the parties acknowledge have been
merged into such documents, exhibits and schedules.

 

5.4           
Notices. Any and all notices or other communications or deliveries required or permitted to be provided hereunder
shall be in writing and shall be deemed given and effective on the earliest of: (a) the time of transmission, if such notice or
communication is delivered via facsimile at the facsimile number or email attachment at the email address as set forth on the signature
pages attached hereto at or prior to 5:30 p.m. (New York City time) on a Trading Day, (b) the next Trading Day after the time of
transmission, if such notice or communication is delivered via facsimile at the facsimile number or email attachment at the email
address as set forth on the signature pages attached hereto on a day that is not a Trading Day or later than 5:30 p.m. (New York
City time) on any Trading Day, (c) the second (2nd)Trading Day following the date of mailing, if sent by U.S. nationally
recognized overnight courier service or (d) upon actual receipt by the party to whom such notice is required to be given. The address
for such notices and communications shall be as set forth on the signature pages attached hereto. To the extent that any notice
provided pursuant to any Transaction Document constitutes, or contains, material, non-public information regarding the Company
or any Subsidiaries, the Company shall simultaneously file such notice with the Commission pursuant to a Current Report on Form
8-K.

 

5.5           
Amendments; Waivers. No provision of this Agreement may be waived, modified, supplemented or amended except in a
written instrument signed, in the case of an amendment, by the Company and Purchasers which purchased at least 50.1% in interest
of the sum of (i) the Shares and (ii) the Pre-Funded Warrant Shares initially issuable upon exercise of the Pre-Funded Warrants
based on the initial Subscription Amounts hereunder or, in the case of a waiver, by the party against whom enforcement of any such
waived provision is sought, provided that if any amendment, modification or waiver disproportionately and adversely impacts a Purchaser
(or group of Purchasers), the consent of such disproportionately impacted Purchaser (or group of Purchasers) shall also be required.
No waiver of any default with respect to any provision, condition or requirement of this Agreement shall be deemed to be a continuing
waiver in the future or a waiver of any subsequent default or a waiver of any other provision, condition or requirement hereof,
nor shall any delay or omission of any party to exercise any right hereunder in any manner impair the exercise of any such right.
Any proposed amendment or waiver that disproportionately, materially and adversely affects the rights and obligations of any Purchaser
relative to the comparable rights and obligations of the other Purchasers shall require the prior written consent of such adversely
affected Purchaser. Any amendment effected in accordance with this Section 5.5 shall be binding upon each Purchaser and holder
of Securities and the Company.

 

5.6           
Headings. The headings herein are for convenience only, do not constitute a part of this Agreement and shall not
be deemed to limit or affect any of the provisions hereof.

 

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5.7            
Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of the parties and their successors
and permitted assigns. The Company may not assign this Agreement or any rights or obligations hereunder without the prior written
consent of each Purchaser (other than by merger). Any Purchaser may assign any or all of its rights under this Agreement to any
Person to whom such Purchaser assigns or transfers any Securities, provided that such transferee agrees in writing to be bound,
with respect to the transferred Securities, by the provisions of the Transaction Documents that apply to the “Purchasers.”

 

5.8 
            No Third-Party Beneficiaries. The Placement Agent shall be the third party beneficiary of the representations and
warranties of the Company in Section 3.1 and the representations and warranties of the Purchasers in Section 3.2 and the covenants
in Section 4.16. 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 4.8, Section 4.16 and this Section 5.8.

 

5.9            
Governing Law. All questions concerning the construction, validity, enforcement and interpretation of the Transaction
Documents shall be governed by and construed and enforced in accordance with the internal laws of the State of New York, without
regard to the principles of conflicts of law thereof. Each party agrees that all legal Proceedings concerning the interpretations,
enforcement and defense of the transactions contemplated by this Agreement and any other Transaction Documents (whether brought
against a party hereto or its respective affiliates, directors, officers, shareholders, partners, members, employees or agents)
shall be commenced exclusively in the state and federal courts sitting in the City of New York. Each party hereby irrevocably submits
to the exclusive jurisdiction of the state and federal courts sitting in the City of New York, Borough of Manhattan for the adjudication
of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein (including with
respect to the enforcement of any of the Transaction Documents), and hereby irrevocably waives, and agrees not to assert in any
Action or Proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such Action or Proceeding
is improper or is an inconvenient venue for such Proceeding. Each party hereby irrevocably waives personal service of process and
consents to process being served in any such Action or Proceeding by mailing a copy thereof via registered or certified mail or
overnight delivery (with evidence of delivery) to such party at the address in effect for notices to it under this Agreement and
agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall
be deemed to limit in any way any right to serve process in any other manner permitted by law. If any party shall commence an Action
or Proceeding to enforce any provisions of the Transaction Documents, then, in addition to the obligations of the Company under
Section 4.8, the prevailing party in such Action or Proceeding shall be reimbursed by the non-prevailing party for its reasonable
attorneys’ fees and other costs and expenses incurred with the investigation, preparation and prosecution of such Action
or Proceeding.

 

5.10          
Survival. The representations and warranties contained herein shall survive the Closing and the delivery of the Securities.

 

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5.11          
Execution. This Agreement may be executed in two or more counterparts, all of which when taken together shall be
considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered
to each other party, it being understood that the parties need not sign the same counterpart. In the event that any signature is
delivered by facsimile transmission or by e-mail delivery of a “.pdf” format data file, such signature shall create
a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect
as if such facsimile or “.pdf” signature page were an original thereof.

 

5.12          
Severability. If any term, provision, covenant or restriction of this Agreement is held by a court of competent jurisdiction
to be invalid, illegal, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions set forth herein
shall remain in full force and effect and shall in no way be affected, impaired or invalidated, and the parties hereto shall use
their commercially reasonable efforts to find and employ an alternative means to achieve the same or substantially the same result
as that contemplated by such term, provision, covenant or restriction. It is hereby stipulated and declared to be the intention
of the parties that they would have executed the remaining terms, provisions, covenants and restrictions without including any
of such that may be hereafter declared invalid, illegal, void or unenforceable.

 

5.13          
Rescission and Withdrawal Right. Notwithstanding anything to the contrary contained in (and without limiting any
similar provisions of) any of the other Transaction Documents, whenever any Purchaser exercises a right, election, demand or option
under a Transaction Document and the Company does not timely perform its related obligations within the periods therein provided,
then such Purchaser may rescind or withdraw, in its sole discretion from time to time upon written notice to the Company, any relevant
notice, demand or election in whole or in part without prejudice to its future actions and rights; provided, however, that in the
case of a rescission of an exercise of a Warrant, the applicable Purchaser shall be required to return any shares of Common Stock
subject to any such rescinded exercise notice concurrently with the return to such Purchaser of the aggregate exercise price paid
to the Company for such shares and the restoration of such Purchaser’s right to acquire such shares pursuant to such Purchaser’s
Warrant (including, issuance of a replacement warrant certificate evidencing such restored right).

 

5.14          
Replacement of Securities. If any certificate or instrument evidencing any Securities is mutilated, lost, stolen
or destroyed, the Company shall issue or cause to be issued in exchange and substitution for and upon cancellation thereof (in
the case of mutilation), or in lieu of and substitution therefor, a new certificate or instrument, but only upon receipt of evidence
reasonably satisfactory to the Company of such loss, theft or destruction. The applicant for a new certificate or instrument under
such circumstances shall also pay any reasonable third-party costs (including customary indemnity) associated with the issuance
of such replacement Securities.

 

5.15          
Remedies. In addition to being entitled to exercise all rights provided herein or granted by law, including recovery
of damages, each of the Purchasers and the Company will be entitled to specific performance under the Transaction Documents. The
parties agree that monetary damages may not be adequate compensation for any loss incurred by reason of any breach of obligations
contained in the Transaction Documents and hereby agree to waive and not to assert in any Action for specific performance of any
such obligation the defense that a remedy at law would be adequate.

 

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5.16          
Payment Set Aside. To the extent that the Company makes a payment or payments to any Purchaser pursuant to any Transaction
Document or a Purchaser enforces or exercises its rights thereunder, and such payment or payments or the proceeds of such enforcement
or exercise or any part thereof are subsequently invalidated, declared to be fraudulent or preferential, set aside, recovered from,
disgorged by or are required to be refunded, repaid or otherwise restored to the Company, a trustee, receiver or any other Person
under any law (including, without limitation, any bankruptcy law, state or federal law, common law or equitable cause of action),
then to the extent of any such restoration the obligation or part thereof originally intended to be satisfied shall be revived
and continued in full force and effect as if such payment had not been made or such enforcement or setoff had not occurred.

 

5.17          
Independent Nature of Purchasers’ Obligations and Rights. The obligations of each Purchaser under any Transaction
Document are several and not joint with the obligations of any other Purchaser, and no Purchaser shall be responsible in any way
for the performance or non-performance of the obligations of any other Purchaser under any Transaction Document. Nothing contained
herein or in any other Transaction Document, and no action taken by any Purchaser pursuant hereto or thereto, shall be deemed to
constitute the Purchasers as a partnership, an association, a joint venture or any other kind of entity, or create a presumption
that the Purchasers 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 Purchaser 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 Purchaser to be joined as an additional party in any Proceeding for such purpose. Each Purchaser has been represented
by its own separate legal counsel in its review and negotiation of the Transaction Documents. For reasons of administrative convenience
only, each Purchaser and its respective counsel have chosen to communicate with the Company through the legal counsel of the Placement
Agent. The legal counsel of the Placement Agent does not represent any of the Purchasers and only represents the Placement Agent.
The Company has elected to provide all Purchasers with the same terms and Transaction Documents for the convenience of the Company
and not because it was required or requested to do so by any of the Purchasers. It is expressly understood and agreed that each
provision contained in this Agreement and in each other Transaction Document is between the Company and a Purchaser, solely, and
not between the Company and the Purchasers collectively and not between and among the Purchasers.

 

5.18          
Liquidated Damages. The Company’s obligations to pay any partial liquidated damages or other amounts owing
under the Transaction Documents is a continuing obligation of the Company and shall not terminate until all unpaid partial liquidated
damages and other amounts have been paid notwithstanding the fact that the instrument or security pursuant to which such partial
liquidated damages or other amounts are due and payable shall have been canceled.

 

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5.19          
Saturdays, Sundays, Holidays, etc.If the last or appointed day for the taking of any action or the expiration
of any right required or granted herein shall not be a Business Day, then such action may be taken or such right may be exercised
on the next succeeding Business Day.

 

5.20          
Construction. The parties agree that each of them and/or their respective counsel have reviewed and had an opportunity
to revise the Transaction Documents and, therefore, the normal rule of construction to the effect that any ambiguities are to be
resolved against the drafting party shall not be employed in the interpretation of the Transaction Documents or any amendments
thereto. In addition, each and every reference to share prices and shares of Common Stock in any Transaction Document shall be
subject to adjustment for reverse and forward stock splits, stock dividends, stock combinations and other similar transactions
of the Common Stock that occur after the date of this Agreement.

 

5.21          
WAIVER OF JURY TRIAL. IN ANY ACTION, SUIT, OR PROCEEDING IN ANY JURISDICTION BROUGHT BY ANY PARTY AGAINST ANY
OTHER PARTY, THE PARTIES EACH KNOWINGLY AND INTENTIONALLY, TO THE GREATEST EXTENT PERMITTED BY APPLICABLE LAW, HEREBY ABSOLUTELY,
UNCONDITIONALLY, IRREVOCABLY AND EXPRESSLY WAIVES FOREVER TRIAL BY JURY. 

 

(Signature Pages Follow)

 

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

 

	Onconova Therapeutics, Inc. 	 	Address for Notice:
	 	 	 
	By:	 	 	Fax: 
	 	Name:	 	E-mail:
	 	Title:	 	 
	 	 	 	 
	With a copy to (which shall not constitute notice):	 	 

 

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

SIGNATURE PAGE FOR PURCHASER FOLLOWS]

 

    36

     

    

 

[PURCHASER SIGNATURE PAGES TO ONTX 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: ______________________________________________________

 

Signature of Authorized Signatory of
Purchaser: _________________________________

 

Name of Authorized Signatory: _______________________________________________

 

Title of Authorized Signatory: ________________________________________________

 

Email Address of Authorized Signatory:_________________________________________

 

Facsimile Number of Authorized Signatory: __________________________________________

 

Address for Notice to Purchaser:

 

 

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

 

 

DWAC for Shares:

 

Subscription Amount: $_________________

 

Class A Units: _________________

 

Shares: _________________

 

Series A Warrant Shares: ______________

 

Class B Units: _______________

 

Pre-Funded Warrants:_________________

 

Series A Warrant Shares: ______________

 

EIN Number: ____________________

 

    37

     

    

 

Lesser of maximum amount permitted pursuant
to Section 2.1 and the limitation on Beneficial Ownership and $____________

 

(for purposes of clarity, the amount set
forth on the immediately above line of this signature page is included in such Purchaser’s “Subscription Amount”
for purposes of this Agreement and the Transaction Documents)

 

 ̈
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]

 

    38

     

    

 

SCHEDULE 3.1(g)

 

See the section entitled “Capitalization” in the
Company’s Amendment No. 2 to the Registration Statement on Form S-1 (Registration No. 333-234360) filed with the Commission
on November 14, 2019.

 

    39

     

    

 

SCHEDULE 3.1(i)

 

The Company disclosed material changes since December 31, 2018
in its SEC reports filed subsequent to the Form 10-K for the year ended December 31, 2018.

 

In addition, the Company disclosed in its Quarterly Report on
Form 10-Q for the quarter ended September 30, 2019 that the Company’s cash and cash equivalents as of September 30, 2019
was approximately $4.82 million. Since September 30, 2019, the Company has continued to spend cash in a manner consistent with
its past practices.

 

    40

     

    

 

SCHEDULE 3.1(r)

 

The Company disclosed the following in Note 12 to the Company’s
unaudited condensed consolidated interim financial statements included in its Quarterly Report on Form 10-Q for the quarter ended
September 30, 2019:

 

12. Related-Party Transactions

 

The Company has entered into a research agreement, as subsequently
amended, with the Mount Sinai School of Medicine (“Mount Sinai”), with which a member of its board of directors and
a stockholder is affiliated. Mount Sinai is undertaking research on behalf of the Company on the terms set forth in the agreements.
Mount Sinai, in collaboration with the Company, will prepare applications for patents generated from the research. Results from
all projects will belong exclusively to Mount Sinai, but the Company will have an exclusive option to license any inventions, resulting
therefrom. Payments to Mount Sinai under this research agreement for the three months ended September 30, 2019 and 2018 were $88,000
and $88,000, respectively, and for the nine months ended September 30, 2019 and 2018 were $263,000 and $263,000, respectively.
At September 30, 2019 and December 31, 2018, the Company had $88,000 and $88,000, respectively, payable to Mount Sinai under this
agreement.

 

The Company has entered into a consulting agreement with a member
of its board of directors. The board member provides consulting services to the Company on the terms set forth in the agreement.
Payments to this board member for both the three months ended September 30, 2019 and 2018 were $33,000, and for both the nine months
ended September 30, 2019 and 2018 were $99,000. At both September 30, 2019 and December 31, 2018, the Company had $33,000 payable
under this agreement.

 

    41

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