EX-10.43





 Exhibit 10.43 

NEITHER THIS SECURITY NOR THE SECURITIES FOR WHICH THIS SECURITY IS EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE
SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT’), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS. THIS
SECURITY AND THE SECURITIES ISSUABLE UPON EXERCISE OF THIS SECURITY MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN SECURED BY SUCH SECURITIES. 

COMMON STOCK PURCHASE WARRANT 

NEURORX, INC. 
  

			
	Warrant Shares: 1,053,738	  	Issue Date: March 28, 2021

 THIS COMMON STOCK PURCHASE WARRANT (the “Warrant”) certifies that, for value received, GEM
Yield Bahamas Limited (“GEM”) 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 the date hereof (the
“Initial Exercise Date”) and on or prior to 5:00 p.m. (New York City time) on the date that is the third anniversary of the Public Listing Date (the “Termination Date”) but not thereafter, to subscribe for and
purchase from NeuroRx, Inc., a Delaware corporation (the “Company”), up to 1,053,738 shares (as subject to adjustment hereunder, the “Warrant Shares”) of the Company’s common stock (the “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). Notwithstanding anything to the contrary stated herein, the parties hereto agree that
(i) references to the “Company” shall mean any Successor Company, if applicable, and (ii) the Company shall cause any such Successor Company to be bound by the provisions of this Warrant as if it were initially the Company
hereunder. 
 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. 

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

“BRPA” means Big Rock Partners Acquisition Corp., a Delaware corporation. 












 “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. 

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

“Common Stock” means the common stock of the Company, par value $0.001 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. 
 “Exchange Act” means
the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder. 
 “Liens” means a
lien, charge, pledge, security interest, encumbrance, right of first refusal, preemptive right or other restriction. 
 “Merger
Agreement” means that certain Agreement and Plan of Merger, dated as of December 13, 2020, by and among the Company, BRPA, and Big Rock Merger Corp., a Delaware corporation, as amended and/or restated from time to time. 

“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. 

“Public Listing” means the public listing of shares of Common Stock for trading on the Principal Market or the consummation
of a Reverse Merger Transaction, whichever is earlier. 
 “Public Listing Date” means the date on which the Public Listing
occurs. 
 “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. 
 “Principal Market”
means any U.S. national securities exchange on which shares of Common Stock are traded or any other exchange platform in the world on which the shares of Common Stock are traded, including, but not limited to, the London Stock Exchange, the Berlin
Stock Exchange, the Frankfurt Stock Exchange, the SIX Swiss Exchange or the Stock Exchange of Hong Kong. 
 “Reverse Merger
Transaction” means a reverse merger or other similar transaction between the Company and a special purpose acquisition company, “shell” company, or other similar Person, in each case, whose securities are publicly listed on the
Principal Market, including without limitation, that certain merger of the Company contemplated pursuant to the Merger Agreement. 












 “Securities Act” means the Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder. 
 “Successor Company” means (i) upon completion of the transactions
contemplated by the Merger Agreement, NRX Pharmaceuticals, Inc., a Delaware corporation, (ii) any company the common equity shares of which are traded on the Principal Market with which the Company, indirectly or directly, merges and
(iii) any successor or similar entity of the Company (whether by merger, consolidation or otherwise) or any subsidiary or Affiliate of, or other similar entity related to, the Company or any subsidiary or Affiliate thereof, in each case, formed
for the purpose of facilitating, or in connection with, a Public Listing. 
 “Transfer Agent” means Alessandra F. V.
Daigneault, Esq. with offices located at 677 Old Hunt Way, Herndon, Virginia 20170, and any successor transfer agent of the Company. 

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 two (2) Business Days 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. 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) Business 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 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.  












 b) Exercise Price. The exercise price per share of Common Stock under this Warrant
shall be $15.84, subject to adjustment hereunder (the “Exercise Price”). 
 c) Mechanics of Exercise. 

(i) Delivery of Warrant Shares Upon Exercise. The Company shall cause the Warrant Shares purchased hereunder to be
transmitted to the Holder 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 two (2) Business Days after the delivery to the Company of the Notice of Exercise (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 is received by the Warrant Share Delivery Date. 
 (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) 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, at its election, either pay a cash adjustment in respect of such final fraction in an amount
equal to such fraction multiplied by the Exercise Price or round up to the next whole share. 
 (v) 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. 












 (vi) 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. 
 d) Partial Exercise;
Registration of Exercised Shares. Concurrently with the execution and delivery of this Warrant, the Holder is delivering an executed Notice of Exercise, under which Holder exercises its right to purchase 473,486 Warrant Shares (the
“Initial Exercised Shares”). Notwithstanding Section 2(a), concurrently with such exercise, the Holder shall transmit funds to the Company in the amount of $7,500,018.24, representing the aggregate Exercise Price for the
Initial Exercised Shares. The Company shall register, or cause to be registered, the Initial Exercised Shares on (a) the same registration statement on Form S-4 (or such other registration statement, if
changed) in connection with transactions contemplated by the Merger Agreement, or (b) such other registration statement in connection with any other transaction which results in a Public Listing of the Company, in the case (a) or (b),
whichever is consummated first, in each case, in order for the Purchaser to receive freely tradeable and unrestricted Initial Exercised Shares. 

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. 












 c) Pro Rata Distributions. During such time as this Warrant is outstanding, if the
Company shall declare or make any dividend or other distribution 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 cash,
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. 

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 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, 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. 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. For the avoidance of doubt, the transactions contemplated by the Merger Agreement shall constitute a Fundamental Transaction for all purposes hereunder. 

e) Non-Dilution. For so long as this Warrant remains unexpired and any portion hereof has not
been exercised by the Holder or its assigns, the Company shall not issue any awards of below-market shares of Common Stock of the Company to any related party shareholders except for awards of stock options to employees and consultants in the
ordinary course of business; provided, however that, in no event, shall Jonathan C. Javitt, MD be the recipient of any such stock option award. 

f) 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. 
 g) 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. 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. 

Section 4. Transfer of Warrant. 

a) Transferability. 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. 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. 












 d) Representation by the Holder. The Holder, by the acceptance hereof, represents and
warrants that it is acquiring this Warrant and, upon any exercise hereof, will acquire the Warrant Shares issuable upon such exercise, for its own account and not with a view to or for distributing or reselling such Warrant Shares or any part
thereof in violation of the Securities Act or any applicable state securities law, except pursuant to sales registered or exempted under the Securities Act. 

Section 5. Ownership Limitation. Notwithstanding anything to the contrary set forth in this Warrant, at no time may a Holder of this
Warrant exercise this Warrant if the number of shares of Common Stock to be issued pursuant to such exercise would exceed, when aggregated with all other shares of Common Stock owned by such Holder and its Affiliates at such time, the number of
shares of Common Stock which would result in such Holder and its Affiliates beneficially owning (as determined in accordance with Section 12(d) of the Exchange Act and the rules thereunder) in excess of 9.99% of the then issued and outstanding
shares of Common Stock (the “Beneficial Ownership Limitation”); provided, however, that upon a Holder of this Warrant providing the Company with sixty-one (61) days’ notice (pursuant
to Section 6 hereof) (the “Waiver Notice”) that such Holder would like to waive this Section 5 with regard to any or all shares of Common Stock issuable upon exercise of this Warrant, this Section 5 will be of no
force or effect with regard to all or a portion of the Warrant referenced in the Waiver Notice until the date that the Holder notifies the Company (pursuant to Section 8 hereof) that the Holder revokes the Waiver Notice; provided, further, that
during the sixty-one (61) day period prior to the Termination Date, the Holder may waive this Section 5 by providing a Waiver Notice at any time during such
sixty-one (61) day period. 
 Section 6. Registration Rights. 

a) No later than 90 days following the Public Listing Date (the “Filing Deadline”), the Company shall file with the Commission
a Registration Statement on Form S-3 (or such other resale registration statement filed in place thereof in the event the Company ceases, or is otherwise not eligible, to use Form S-3, as amended and supplemented from time to time, the “Resale Registration Statement”) to register under the Securities Act the resale by the Holder all Warrant Shares issuable hereunder other
than the Initial Exercised Shares (the “Registrable Securities”) in accordance with methods and distribution set forth in the “Plan of Distribution” therein, and Rule 415 under the Securities Act. The Resale
Registration Statement shall contain a prospectus naming the Holder as the selling stockholder. The Company shall use its reasonable best efforts to respond to comments received from the Commission to such Resale Registration Statement, and amend or
supplement such filing, if required, as promptly as practicable, and thereafter to use its reasonable best efforts to cause such initially filed Resale Registration Statement to be declared effective as promptly as practicable by the Commission. The
Company shall use its reasonable best efforts to keep the Resale Registration Statement effective until the earlier of (i) the date that the Registrable Securities issued to the Holder are sold or otherwise transferred by the Holder, or
(ii) the second year anniversary of the Public Listing Date (such earlier date, the “Effectiveness Deadline”). All expenses related to preparation and the filing with the Commission of the Resale Registration Statement and
maintaining the effectiveness of the Resale Registration Statement under the Securities Act shall be borne by the Company. 












 b) The Holder shall furnish to the Company such information regarding itself and its
partners and members and its controlling persons, and the manner of distribution proposed by the Holder as the Company may reasonably request in connection with the Resale Registration Statement and the information required to be included therein by
the Securities Act and the rules promulgated thereunder. The Company shall provide the Holder with a reasonable opportunity to review any disclosures relating to the Holder and the “Plan of Distribution” included in the Resale Registration
Statement and will consider in good faith any comments offered by the Holder to such disclosures. The Company shall give prompt notice to the Holder of the issuance of any stop-order by the Commission or the occurrence of any event or the existence
of any facts or circumstance that requires the Company to amend or supplement the Resale Registration Statement and the prospectus contained therein in order to keep the Resale Registration Statement effective and such prospectus from containing any
untrue statement of material fact or from omitting to state a material fact required to be stated therein or necessary to make the statements therein not misleading in light of all circumstances then existing (an “Intervening
Event”), and the Holder agrees that upon receipt of any such notice from the Company, it shall forthwith discontinue using such prospectus until it receives copies of a supplemented or amended prospectus or until it is advised in writing by
the Company that the use of such prospectus may be resumed. The Company may delay the filing of any such amendment or supplement or the effective date of the Resale Registration Statement for up to twenty (20) days upon notice to the Holder in
the event that the Company determines in good faith that such amendment or supplement or effectiveness would require the Company to make a disclosure that would be materially detrimental to the Company or jeopardize the ability of the Company to
undertake the Intervening Event; provided, that such right to delay a filing shall be exercised by the Company for a period no longer than sixty (60) days in any 12-month period; provided
further that in the event of such a delay, the Company shall not provide any material, non-public information concerning such event to the Holder. 

c) The Company agrees to indemnify and hold the Holder, each person, if any, who controls the Holder within the meaning of either
Section 15 of the Securities Act or Section 20 of the Exchange Act, harmless against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with
defending or investigating any such action or claim) incurred by the Holder directly that are caused by any untrue statement or alleged untrue statement of a material fact contained in the Resale Registration Statement (including the prospectus
contained therein) or any amendment thereof (including the prospectus contained therein) or caused by any omission or alleged omission to state therein a material fact necessary in order to make the statements therein (in the case of a prospectus,
in the light of the circumstances under which they were made), not misleading, except insofar as the same are caused by or contained in any information furnished in writing to the Company by the Holder expressly for use therein. In no event shall
the liability of the Company be greater in amount than the dollar amount received by the Company from such Holder upon the partial exercise of the Warrant giving rise to the Warrant Shares subject to such indemnification obligation. The indemnity
agreement contained in this Section 6.6(c) shall not apply to amounts paid in settlement of any such loss, claim, damage, liability or action if such settlement is effected without the consent of the Company (which consent shall not be
unreasonably withheld). 












 d) The Holder agrees to, severally and not jointly, indemnify and hold harmless the Company,
its directors, officers, agents and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act, harmless against any and all losses, claims, damages and
liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) incurred by the Company directly that are caused by any untrue statement or alleged
untrue statement of a material fact contained in the Resale Registration Statement (including the prospectus contained therein) or any amendment thereof (including the prospectus contained therein) or caused by any omission or alleged omission to
state therein of a material fact necessary in order to make the statements therein (in the case of a prospectus, in light of the circumstances under which they were made), not misleading, insofar as the same are caused by or contained in any
information furnished in writing to the Company by the Holder expressly for use therein. In no event shall the liability of any Holder be greater in amount than the dollar amount of the net proceeds received by such Holder upon the sale of the
Registrable Shares giving rise to such indemnification obligation. The indemnity agreement contained in this Section 6.6(d) shall not apply to amounts paid in settlement of any such loss, claim, damage, liability or action if such
settlement is effected without the consent of the Holder (which consent shall not be unreasonably withheld). 
 e) Notwithstanding anything
to the contrary stated herein, in addition to any other remedies available at law or equity or as set forth herein or otherwise, if (i) the Company shall have failed to file the Resale Registration Statement by the Filing Deadline (subject to
extension due to an Intervening Event as provided hereunder) or (ii) the Registration Statement is not declared effective by the Effectiveness Deadline (subject to extension due to an Intervening Event as provided hereunder), in each case, then
the Company shall pay to the Holder or its designee an amount equal to $100,000 for each day following the Filing Deadline or Effectiveness Deadline (subject, in each case, to extension due to an Intervening Event as provided hereunder), as
applicable, until the Registration Statement has been filed with the Commission or the Registration Statement has been declared effective, as applicable. 

f) The Company shall provide the Holder a reasonable opportunity to review and comment on the Resale Registration Statement and any amendments
or supplements thereto prior to their applicable filing and shall give due consideration and incorporate any such reasonable comments provided by the Holder or its counsel. Upon receipt of the Resale Registration Statement or amendment or supplement
thereto from the Company or its counsel, the Holder shall promptly review such document and provide comments to the Company or its counsel regarding such document, if any, within a reasonable period of time. 

g) Without limiting any of the Company’s obligations hereunder, if there is not an effective Registration Statement covering all of the
Registrable Shares and the Company shall determine to prepare and file with the SEC a registration statement relating to an offering for its own account or the account of others under the Securities Act of any of its equity securities (other than on
Form S-4 or Form S-8 (each as promulgated under the Securities Act) or their then equivalents relating to equity securities to be issued solely in













 
connection with any acquisition of any entity or business or equity securities issuable in connection with the Company’s option or other employee benefit plans), then the Company shall
deliver to the Holder a written notice of such determination and, if within five days after the date of the delivery of such notice, the Holder shall so request in writing, the Company shall include in such registration statement all or any part of
such Registrable Shares the offer and sale of which the Holder requests to be registered; provided, however, the Company shall not be required to register the offer and sale of any Registrable Shares pursuant to this Section (g) that are
eligible for resale pursuant to Rule 144 without restriction (including, without limitation, volume restrictions) and without the need for current public information required by Rule 144(c)(1) (or Rule 144(i)(2), if applicable) or that are the
subject of a then-effective Registration Statement. 
 Section 7. Certain Additional Covenants. 

a) Compliance with Applicable Laws. So long as the Warrant remains outstanding, the Company shall comply in all material respects
with all applicable laws, rules, regulations and orders applicable to the business and operations of the Company and with all applicable provisions of the Securities Act and the Exchange Act and the rules and regulations of the Principal Market,
including in respect of the issuance of any Warrant Shares hereunder. 
 b) Entry into Other Agreements. The Company shall not
enter into any agreement in which the terms of such agreement would restrict or impair the right to perform of the Company under this Warrant. 

c) Non-Public Information. Until the later of (i) the Termination Date, and
(ii) such time as the Holder no longer hold any Warrant Shares, neither the Company, nor any of its directors, officers or agents shall disclose any material non-public information about the Company to
the Holder without the Holder’s prior written consent. 
 d) DWAC Eligibility. The Company shall use its reasonable best
efforts to cause the Warrant Shares and its Transfer Agent to be eligible to participate in the DWAC system. 
 Section 8. Miscellaneous.

 a) No Rights as Stockholder Until Exercise. 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. 

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 Business Day, then, such action may be taken or such right may be exercised on the next succeeding Business 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 executing stock certificates to execute and issue 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 Principal 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. 












 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 conflict of laws thereof. Each party agrees that all legal
proceedings concerning the interpretation, enforcement and defense of this Warrant shall be commenced in the state and federal courts sitting in the City of New York, Borough of Manhattan (the “New York Courts”). Each party hereto hereby
irrevocably submits to the exclusive jurisdiction of the New York Courts 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 suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of such New York Courts, or such New York
Courts are improper or inconvenient venue for such proceeding. Each party hereto hereby irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to
this Warrant. If any party shall commence an action or proceeding to enforce any provisions of this Warrant, then the prevailing party in such action or proceeding shall be reimbursed by the other party for its attorneys’ fees and other costs
and expenses incurred in 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, 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 sent by a nationally recognized overnight courier service, addressed to the Company, at the address set forth above Attention: Alessandra
Daigneault, facsimile number (703) 636-7798, email address adaigneault@neurorxpharma.com 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 sent by a nationally recognized overnight courier service addressed to each Holder at the facsimile number or address of such Holder appearing on the books of the Company, or if no
such facsimile number or address appears 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 date of transmission, if such notice or communication
is delivered via facsimile at the facsimile number set forth in this Section prior to 5:30 p.m. (New York City time) on any date, (ii) the next Business Day after the date of transmission, if such notice or communication is delivered via
facsimile at the facsimile number set forth in this Section on a day that is not a Business Day or later than 5:30 p.m. (New York City time) on any Business Day, (iii) the second Business 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. 

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. It is accordingly agreed that the Holder shall be entitled to an injunction or injunctions from any court of competent jurisdiction or arbitral authority to prevent or cure breaches of the provisions of this
Warrant by the Company and to enforce specifically the terms and provisions hereof; such right is in addition to any other remedy to which the Holder may be entitled by law or equity, without the necessity of posting a bond or other security or the
burden of proving actual damages. 
 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. 
 o) Entire Agreement. This Warrant, together with that
certain Share Subscription Facility Agreement, dated October 18, 2019, by and between the parties hereto (the “SSF”), represent the entire agreement amongst the parties hereto with respect to the subject matter hereof, and there are
no promises, undertakings, representations or warranties by either party relative to the subject matter hereof not expressly set forth herein. In furtherance thereof, the parties hereby reaffirm the validity and enforceability of the SSF including,
but not limited to, the issuance of this Warrant. 
 p) Further Assurance. From and after the date of this Warrant, upon the request
of the Holder and the Company, each of the Holder and the Company shall execute and deliver such instrument, documents and other writings as may be reasonably necessary or desirable to confirm and carry out and to effectuate fully the intent and
purposes of this Warrant. Each party hereby expressly agrees that, in the event that any action or determination of the Commission or other regulatory or governmental authority, or the refusal or failure of any other governmental approval, would or
does prohibit or otherwise materially interfere with the ability of the parties to effect the transactions contemplated by either this Warrant or the SSF in the manner contemplated by and described therein, each such party shall use its good faith
best efforts to resolve and cure such condition, including, without limitation, by amending this Warrant and/or the SSF to the extent necessary therefor. 

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

			
	NEURORX, INC.
		
	By:	 	 /s/ Alessandra F. V. Daigneault

		 	Alessandra Daigneault
		 	Corporate Secretary


  

			
	AGREED AND ACKNOWLEDGED:
	
	GEM YIELD BAHAMAS LIMITED
		
	By:	 	 /s/ Christopher Brown

		 	Christopher Brown
		 	Director













 NOTICE OF EXERCISE 

 

	TO:	 NEURORX, 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) The undersigned hereby agrees to
wire immediately available funds as provided in the attached wire instructions to the account of the Company on                      the
amount of
                                        
($                    ) in full payment of the exercise price for the above Warrant Shares being purchased. 

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

 

			
	GEM Yield Bahamas Limited
		
	By:	 	  

		 	Christopher Brown
		 	Director

 Date: 












 EXHIBIT B 

ASSIGNMENT FORM 
 (To assign
the foregoing Warrant, execute this form and supply required information. Do not use this form 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: