Document:

Exhibit 10.1.1

 

AGREEMENT

 

This AGREEMENT (this “Agreement”)
is made as of this 20th day of December 2021 by and between Petra Acquisition, Inc. (“Petra”) and Revelation Biosciences,
Inc. (“Buyer”).

 

WHEREAS, Petra was organized
for the purpose of acquiring, through a merger, capital stock exchange, asset acquisition or other similar business combination, an operating
business (“Business Combination”);

 

WHEREAS, Petra has entered
into that certain Merger Agreement as of August 27, 2021 by and among Petra, Revelation Biosciences, Inc. (“Target”), and
Petra Acquisition Merger Sub Inc. (the “Acquisition Agreement”);

 

WHEREAS, the public holders
of Petra common stock may redeem their shares of Petra common stock (“Common Stock”) for a portion of the funds being held
in Petra’s trust account in connection with the Business Combination; and

 

WHEREAS, subject to the
terms of this Agreement, Buyer will agree to purchase up to $2.5 million of shares (the “Shares”) of Common Stock.

 

NOW, THEREFORE, in consideration
of the mutual covenants hereinafter set forth and other good and valuable consideration, the sufficiency of which is hereby acknowledged,
the parties hereby agree as follows:

 

ARTICLE I

Purchase
and Closing

 

Section 1.01 Purchase.
In the event that Petra receives redemption requests from its public stockholders for an aggregate amount of $31.5 million or greater,
Buyer hereby agrees that it will purchase from such redeeming public stockholders $2 million of Shares, at prices no greater than the
redemption amount per public share of Common Stock at the closing of the vote for the Business Combination; provided, however, that the
number of Shares to be purchased by Buyer from the redeeming public stockholders pursuant to this Section 1.01 shall be reduced by the
number of shares of Common Stock, if any, acquired by the Buyer in the open market following the date of this Agreement (based on the
purchase price paid by Buyer for such Shares in the open market). The closing of the purchase of the Shares by Buyer from the redeeming
public stockholders shall occur prior to the Special Meeting of Petra’s stockholders to vote on the approval of the Business Combination.
Buyer further agrees not to request redemption of any of the Shares acquired in the open market.

 

    1

     

    

 

ARTICLE II

Representations
and Warranties of Petra

 

Petra hereby represents and
warrants to Buyer on the date hereof and as of the Closing that:

 

Section 2.01 Organization.
Petra is a corporation, duly incorporated, validly existing and in good standing in the jurisdiction of its incorporation. Petra has the
requisite corporate power and authority to execute, deliver and carry out the terms of this Agreement and to consummate the transactions
contemplated hereby and thereby.

 

Section 2.02 Authority;
Non-Contravention. This Agreement has been validly authorized, executed and delivered by Petra and assuming the due authorization,
execution and delivery thereof by Buyer, is a valid and binding agreement enforceable in accordance with its terms, subject to the general
principles of equity and to bankruptcy or other laws affecting the enforcement of creditors’ rights generally. The execution, delivery
and performance of this Agreement by Petra does not and will not conflict with, violate or cause a breach of, constitute a default under,
or result in a violation of (i) any agreement, contract or instrument to which Petra is a party which would prevent Petra from performing
its obligations hereunder or (ii) any law, statute, rule or regulation to which Petra is subject.

 

ARTICLE III

Representations
and Warranties of the Buyer

 

Buyer hereby represents and
warrants to Petra on the date hereof and as of the Closing that:

 

Section 3.01 Organization.
Buyer is a corporation or limited liability company, duly incorporated or organized, validly existing and in good standing in the jurisdiction
of its incorporation or organization. Buyer has the requisite corporate or limited liability company power and authority to execute, deliver
and carry out the terms of this Agreement and to consummate the transactions contemplated hereby and thereby.

 

Section 3.02 Authority;
Non-Contravention. This Agreement has been validly authorized, executed and delivered by Buyer and assuming the due authorization,
execution and delivery thereof by Petra, is a valid and binding agreement enforceable in accordance with its terms, subject to the general
principles of equity and to bankruptcy or other laws affecting the enforcement of creditors’ rights generally. The execution, delivery
and performance of this Agreement by Buyer does not and will not conflict with, violate or cause a breach of, constitute a default under,
or result in a violation of (i) any agreement, contract or instrument to which Buyer is a party which would prevent Buyer from performing
its obligations hereunder or (ii) any law, statute, rule or regulation to which Buyer is subject.

 

Section 3.03 Governmental
Approvals. All consents, approvals, orders, authorizations, registrations, qualifications, designations, declarations or filings with
any governmental or other authority on the part of Buyer required in connection with the consummation of the transactions contemplated
in the Agreement have been or shall have been obtained prior to and be effective as of the Closing.

 

    2

     

    

 

Section 3.04 Sophisticated
Buyer. Buyer is sophisticated in financial matters and is able to evaluate the risks and benefits attendant to the purchase of Shares.

 

Section 3.05 No Brokers.
No broker, investment banker, financial advisor, finder or other person has been retained by or is authorized to act on behalf of Buyer
that will be entitled to any fee or commission for which Petra will be liable in connection with the execution of this Agreement or the
consummation of the transactions contemplated hereby.

 

ARTICLE IV

Acknowledgement;
Waiver; Registration Rights

 

Section 4.01 Acknowledgement;
Waiver. Buyer (i) acknowledges that Petra may possess or have access to material non-public information which has not been and will
not be communicated to Buyer; (ii) hereby waives any and all claims, whether at law, in equity or otherwise, that he, she, or it may now
have or may hereafter acquire, whether presently known or unknown, against Petra or any of its officers, directors, employees, agents,
affiliates, subsidiaries, successors or assigns relating to any failure to disclose any non-public information in connection with the
transactions contemplated by this Agreement, including without limitation, any such claims arising under the securities or other laws,
rules and regulations, and (iii) is aware that Petra is relying on the foregoing acknowledgement and waiver in clauses (i) and (ii) above,
respectively, in connection with the transactions contemplated by this Agreement.

 

ARTICLE V

Miscellaneous

 

Section 5.01  Termination.
This Agreement shall terminate on the earlier of (i) the closing of the Business Combination, (ii) the date the Acquisition Agreement
is terminated, and (iii) January 31, 2022.

 

Section 5.02  Counterparts;
Facsimile. This Agreement may be executed in any number of counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same instrument. This Agreement or any counterpart may be executed via facsimile
transmission, and any such executed facsimile copy shall be treated as an original.

 

Section 5.03 Governing
Law. This Agreement shall for all purposes be deemed to be made under and shall be construed in accordance with the laws of New York.
Each of the parties hereby agrees that any action, proceeding or claim against it arising out of or relating in any way to this Agreement
shall, to the fullest extent applicable, be brought and enforced first in the Southern District of New York, then to such other court
in the State of New York as appropriate and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive. Each of the
parties hereby waives any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum.

 

    3

     

    

 

Section 5.04 Remedies
Cumulative. Each of the parties hereto acknowledges and agrees that, in the event of any breach of any covenant or agreement contained
in this Agreement by the other party, money damages may be inadequate with respect to any such breach and the non-breaching party may
have no adequate remedy at law. It is accordingly agreed that each of the parties hereto shall be entitled, in addition to any other remedy
to which they may be entitled at law or in equity, to seek injunctive relief and/or to compel specific performance to prevent breaches
by the other party hereto of any covenant or agreement of such other party contained in this Agreement. Accordingly, Buyer hereby agrees
that Petra is entitled to an injunction prohibiting any conduct by the Buyer in violation of this Agreement and the Buyer shall not seek
the posting of any bond in connection with such request for an injunction. Furthermore, in any action by Petra to enforce this Agreement,
Buyer waives its right to assert any counterclaims and its right to assert set-off as a defense. The prevailing party agrees to pay all
costs and expenses, including reasonable attorneys’ and experts’ fees that such prevailing party may incur in connection with the enforcement
of this Agreement.

 

Section 5.05 Severability.
If any term, provision or covenant of this Agreement is held by a court of competent jurisdiction or other authority to be invalid, void
or unenforceable, the remainder of the terms, provisions and covenants of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated

 

Section 5.06 Binding
Effect; Assignment. This Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective legal
representatives, successors and permitted assigns.

 

Section 5.07 Headings.
The descriptive headings of the Sections hereof are inserted for convenience only and do not constitute a part of this Agreement.

 

Section 5.08 Entire
Agreement; Changes in Writing. This Agreement constitutes the entire agreement among the parties hereto and supersedes and cancels
any prior agreements, representations and warranties, whether oral or written, among the parties hereto relating to the transaction contemplated
hereby. Neither this Agreement nor any provision hereof may be changed or amended orally, but only by an agreement in writing signed by
the other party hereto.

 

Section 5.09 Waiver.
Reference is made to the Final Prospectus of Petra dated October 7, 2020 (the “Prospectus”). Capitalized terms used and not
otherwise defined herein shall have the meanings assigned to them in the Prospectus.

 

Holder has read the Prospectus
and understand that Petra has established a “trust account,” initially in an amount of at least $70,000,000 for the benefit
of the “public stockholders” and the underwriters of Petra’s initial public offering (the “Underwriters”)
and that, except for certain exceptions described in the Prospectus, Petra may disburse monies from the trust account only: (i) to the
public stockholders in the event of the conversion of their shares or the liquidation of Company; or (ii) to Petra and the underwriters
after consummation of a business combination, as described in the Prospectus.

 

For and in consideration of
Petra entering into this Agreement with Holder, Holder hereby agrees that it does not have any right, title, interest or claim of any
kind in or to any monies in the trust account (other than in connection with redemption rights or the dissolution of Petra) (“Claim”)
and hereby waives any Claim it may have in the future as a result of, or arising out of, any negotiations, contracts or agreements with
Petra and will not seek recourse against the trust account for any reason whatsoever, other than in connection with redemption rights
or the dissolution of Petra.

 

Section 5.10 Further
Assurances. If at any time any of the parties hereto shall consider or be advised that any further documents or actions are necessary
or desirable to vest, perfect or confirm of record or otherwise the rights, title or interest in or to the Shares or under or otherwise
pursuant to this Agreement, the parties hereto shall execute and deliver such further documents or take such actions and provide all assurances
and to take and do all such other actions and things as may be necessary or desirable to vest, perfect or confirm any and all right, title
and interest in or to the Shares or under or otherwise pursuant to this Agreement.

 

    4

     

    

 

IN WITNESS WHEREOF, the undersigned
have executed this Agreement as of the date set forth on the first page of this Agreement.

 

		PETRA ACQUISITION, INC.  
	 	 	 
	 	By:	/s/ Andreas Typaldos
	 	Name: 	Andreas Typaldos
	 	Title: 	Chief Executive Officer

 

	 	REVELATION BIOSCIENCES, INC.
	 	 	 
	 	By:	/s/ James Rolke                  
	 	Name: 	James Rolke
	 	Title:	CEO

 

 

5Exhibit 10.1.2

 

AGREEMENT

 

This AGREEMENT
(this “Agreement”) is made as of this 21th day of December 2021 by and between Petra Acquisition, Inc. (“Petra”)
and Mr. George F. Tidmarsh, M.D., Ph.D. (“Buyer”).

 

WHEREAS, Petra
was organized for the purpose of acquiring, through a merger, capital stock exchange, asset acquisition or other similar business combination,
an operating business (“Business Combination”);

 

WHEREAS, Petra
has entered into that certain Merger Agreement as of August 27, 2021 by and among Petra, Revelation Biosciences, Inc. (“Target”),
and Petra Acquisition Merger Sub Inc. (the “Acquisition Agreement”);

 

WHEREAS, the public
holders of Petra common stock may redeem their shares of Petra common stock (“Common Stock”) for a portion of the funds being
held in Petra’s trust account in connection with the Business Combination; and

 

WHEREAS, subject
to the terms of this Agreement, Buyer will agree to purchase up to $750,000 of shares (the “Shares”) of Common Stock.

 

NOW, THEREFORE,
in consideration of the mutual covenants hereinafter set forth and other good and valuable consideration, the sufficiency of which is
hereby acknowledged, the parties hereby agree as follows:

 

ARTICLE I

Purchase and closing

 

Section 1.01 Purchase.
In the event that Petra receives redemption requests from its public stockholders for an aggregate amount of $31.5 million or greater,
Buyer hereby agrees that it will purchase from such redeeming public stockholders $750,000 of Shares, at prices no greater than the redemption
amount per public share of Common Stock at the closing of the vote for the Business Combination; provided, however, that the number of
Shares to be purchased by Buyer from the redeeming public stockholders pursuant to this Section 1.01 shall be reduced by the number of
shares of Common Stock, if any, acquired by the Buyer in the open market following the date of this Agreement (based on the purchase price
paid by Buyer for such Shares in the open market). The closing of the purchase of the Shares by Buyer from the redeeming public stockholders
shall occur prior to the Special Meeting of Petra’s stockholders to vote on the approval of the Business Combination. Buyer further
agrees not to request redemption of any of the Shares acquired in the open market.

 

     

     

    

  

ARTICLE II

Representations and warranties
of petra

 

Petra hereby represents
and warrants to Buyer on the date hereof and as of the Closing that:

 

Section 2.01 Organization.
Petra is a corporation, duly incorporated, validly existing and in good standing in the jurisdiction of its incorporation. Petra has the
requisite corporate power and authority to execute, deliver and carry out the terms of this Agreement and to consummate the transactions
contemplated hereby and thereby.

 

Section 2.02 Authority;
Non-Contravention. This Agreement has been validly authorized, executed and delivered by Petra and assuming the due authorization,
execution and delivery thereof by Buyer, is a valid and binding agreement enforceable in accordance with its terms, subject to the general
principles of equity and to bankruptcy or other laws affecting the enforcement of creditors’ rights generally. The execution, delivery
and performance of this Agreement by Petra does not and will not conflict with, violate or cause a breach of, constitute a default under,
or result in a violation of (i) any agreement, contract or instrument to which Petra is a party which would prevent Petra from performing
its obligations hereunder or (ii) any law, statute, rule or regulation to which Petra is subject.

 

ARTICLE III

Representations and warranties of the
buyer

 

Buyer hereby represents
and warrants to Petra on the date hereof and as of the Closing that:

 

Section 3.01 Organization.
If Buyer is a corporation or limited liability company, buyer is duly incorporated or organized, validly existing and in good standing
in the jurisdiction of its incorporation or organization; and Buyer has the requisite corporate or limited liability company power and
authority to execute, deliver and carry out the terms of this Agreement and to consummate the transactions contemplated hereby and thereby.

 

Section 3.02 Authority;
Non-Contravention. This Agreement has been validly authorized, executed and delivered by Buyer and assuming the due authorization,
execution and delivery thereof by Petra, is a valid and binding agreement enforceable in accordance with its terms, subject to the general
principles of equity and to bankruptcy or other laws affecting the enforcement of creditors’ rights generally. The execution, delivery
and performance of this Agreement by Buyer does not and will not conflict with, violate or cause a breach of, constitute a default under,
or result in a violation of (i) any agreement, contract or instrument to which Buyer is a party which would prevent Buyer from performing
its obligations hereunder or (ii) any law, statute, rule or regulation to which Buyer is subject.

 

Section
3.03 Governmental Approvals. All consents, approvals, orders, authorizations, registrations, qualifications, designations,
declarations or filings with any governmental or other authority on the part of Buyer required in connection with the consummation
of the transactions contemplated in the Agreement have been or shall have been obtained prior to and be effective as of the
Closing.

 

    2

     

    

 

Section 3.04 Sophisticated
Buyer. Buyer is sophisticated in financial matters and is able to evaluate the risks and benefits attendant to the purchase of Shares.

 

Section 3.05 No
Brokers. No broker, investment banker, financial advisor, finder or other person has been retained by or is authorized to act on behalf
of Buyer that will be entitled to any fee or commission for which Petra will be liable in connection with the execution of this Agreement
or the consummation of the transactions contemplated hereby.

 

ARTICLE IV

Acknowledgement; waiver;
registration rights

 

Section 4.01 Acknowledgement;
Waiver. Buyer (i) acknowledges that Petra may possess or have access to material non-public information which has not been and will
not be communicated to Buyer; (ii) hereby waives any and all claims, whether at law, in equity or otherwise, that he, she, or it may now
have or may hereafter acquire, whether presently known or unknown, against Petra or any of its officers, directors, employees, agents,
affiliates, subsidiaries, successors or assigns relating to any failure to disclose any non- public information in connection with the
transactions contemplated by this Agreement, including without limitation, any such claims arising under the securities or other laws,
rules and regulations, and (iii) is aware that Petra is relying on the foregoing acknowledgement and waiver in clauses (i) and (ii) above,
respectively, in connection with the transactions contemplated by this Agreement.

 

ARTICLE V

Miscellaneous

 

Section 5.01 Termination.
This Agreement shall terminate on the earlier of (i) the closing of the Business Combination, (ii) the date the Acquisition Agreement
is terminated, and (iii) January 31, 2022.

 

Section 5.02 Counterparts;
Facsimile. This Agreement may be executed in any number of counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same instrument. This Agreement or any counterpart may be executed via facsimile
transmission, and any such executed facsimile copy shall be treated as an original.

 

Section 5.03 Governing
Law. This Agreement shall for all purposes be deemed to be made under and shall be construed in accordance with the laws of New York.
Each of the parties hereby agrees that any action, proceeding or claim against it arising out of or relating in any way to this Agreement
shall, to the fullest extent applicable, be brought and enforced first in the Southern District of New York, then to such other court
in the State of New York as appropriate and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive. Each of the
parties hereby waives any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum.

 

Section
5.04 Remedies Cumulative. Each of the parties hereto acknowledges and agrees that, in the event of any breach of any covenant
or agreement contained in this Agreement by the other party, money damages may be inadequate with respect to any such breach and the
non-breaching party may have no adequate remedy at law. It is accordingly agreed that each of the parties hereto shall be entitled, in
addition to any other remedy to which they may be entitled at law or in equity, to seek injunctive relief and/or to compel specific performance
to prevent breaches by the other party hereto of any covenant or agreement of such other party contained in this Agreement. Accordingly,
Buyer hereby agrees that Petra is entitled to an injunction prohibiting any conduct by the Buyer in violation of this Agreement and the
Buyer shall not seek the posting of any bond in connection with such request for an injunction. Furthermore, in any action by Petra to
enforce this Agreement, Buyer waives its right to assert any counterclaims and its right to assert set-off as a defense. The prevailing
party agrees to pay all costs and expenses, including reasonable attorneys’ and experts’ fees that such prevailing party may incur in
connection with the enforcement of this Agreement.

 

    3

     

    

 

Section 5.05 Severability.
If any term, provision or covenant of this Agreement is held by a court of competent jurisdiction or other authority to be invalid, void
or unenforceable, the remainder of the terms, provisions and covenants of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated

 

Section 5.06 Binding
Effect; Assignment. This Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective legal
representatives, successors and permitted assigns.

 

Section 5.07 Headings.
The descriptive headings of the Sections hereof are inserted for convenience only and do not constitute a part of this Agreement.

 

Section 5.08 Entire
Agreement; Changes in Writing. This Agreement constitutes the entire agreement among the parties hereto and supersedes and cancels
any prior agreements, representations and warranties, whether oral or written, among the parties hereto relating to the transaction contemplated
hereby. Neither this Agreement nor any provision hereof may be changed or amended orally, but only by an agreement in writing signed by
the other party hereto.

 

Section 5.09 Waiver.
Reference is made to the Final Prospectus of Petra dated October 7, 2020 (the “Prospectus”). Capitalized terms used and not
otherwise defined herein shall have the meanings assigned to them in the Prospectus.

 

Holder has read
the Prospectus and understand that Petra has established a “trust account,” initially in an amount of at least $70,000,000
for the benefit of the “public stockholders” and the underwriters of Petra’s initial public offering (the “Underwriters”)
and that, except for certain exceptions described in the Prospectus, Petra may disburse monies from the trust account only: (i) to the
public stockholders in the event of the conversion of their shares or the liquidation of Company; or (ii) to Petra and the underwriters
after consummation of a business combination, as described in the Prospectus.

 

For and in consideration
of Petra entering into this Agreement with Holder, Holder hereby agrees that it does not have any right, title, interest or claim of any
kind in or to any monies in the trust account (other than in connection with redemption rights or the dissolution of Petra) (“Claim”)
and hereby waives any Claim it may have in the future as a result of, or arising out of, any negotiations, contracts or agreements with
Petra and will not seek recourse against the trust account for any reason whatsoever, other than in connection with redemption rights
or the dissolution of Petra.

 

Section 5.10 Further
Assurances. If at any time any of the parties hereto shall consider or be advised that any further documents or actions are necessary
or desirable to vest, perfect or confirm of record or otherwise the rights, title or interest in or to the Shares or under or otherwise
pursuant to this Agreement, the parties hereto shall execute and deliver such further documents or take such actions and provide all assurances
and to take and do all such other actions and things as may be necessary or desirable to vest, perfect or confirm any and all right, title
and interest in or to the Shares or under or otherwise pursuant to this Agreement.

 

    4

     

    

 

IN WITNESS WHEREOF, the undersigned
have executed this Agreement as of the date set forth on the first page of this Agreement.

 

	 	PETRA ACQUISITION, INC.

 

	 	By:	    
	 	Name: 	 
	 	Title:	 

 

	 	George F. Tidmarsh, M.D., Ph.D.

 

	 	By:	/s/ George Tidmarsh M.D., Ph.D.
	 	Name:  	George Tidmarsh M.D., Ph.D.
	 	Title:	Owner

 

 

5

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