Document:

Exhibit 10.2

 

FORWARD SHARE PURCHASE AGREEMENT

 

This Forward
Share Purchase Agreement (this “Agreement”) is entered into as of December 21, 2021, by and among (i) Petra Acquisition,
Inc, a Delaware corporation (“Petra”), (ii) Meteora Special Opportunity Fund I, LP, a Delaware limited partnership
(“MSOF”), and (iii) Meteora Capital Partners, LP, a Delaware limited partnership (“MCP” and together
with MSOF, each individually an “Investor” and collectively, the “Investors”). Each of Petra, MSOF
and MCP is individually referred to herein as a “Party” and collectively as the “Parties”.

 

Recitals

 

WHEREAS, Petra
is a special purpose acquisition company, also known as a blank check company, formed for the purpose of effecting a merger, capital stock
exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses;

 

WHEREAS, Petra
has entered into a Business Combination Agreement, dated as of August 29, 2021 (the “Business Combination Agreement”),
by and among Petra, Petra Acquisition Merger Inc., a Delaware corporation (“Merger Sub”), and Revelation Biosciences,
Inc., a Delaware Corporation (“Revelation”), pursuant to which a wholly-owned merger subsidiary of Petra will merge
with and into Revelation, and then Revelation as the surviving company of that merger will merge with and into Petra (such transactions,
the “Business Combination”), which will be renamed Revelation Biosciences, Inc. upon the consummation of that second
merger (Revelation Biosciences, Inc., as the post-combination company shall be referred to herein as the “Company”),
and Petra has filed a definitive proxy statement with the U.S. Securities and Exchange Commission (the “Commission”)
that will seek, among other things, stockholder approval of the Business Combination at a special meeting of shareholders (the “Business
Combination Meeting”); and

 

WHEREAS, the Parties
wish to enter into this Agreement, pursuant to which the Company shall purchase from the Investors, and the Investors may sell and transfer
to the Company, in each case, subject to the conditions set forth herein, certain shares of Common Stock (as defined herein) of Petra
held by the Investors (the “Shares”) on the terms set forth herein.

 

NOW, THEREFORE,
in consideration of the premises, representations, warranties and the mutual covenants contained in this Agreement, and for other good
and valuable consideration, the receipt, sufficiency and adequacy of which are hereby acknowledged, the Parties agree as follows:

 

Agreement

 

 1. Sale of Shares; Shares Purchase and Sale; Closing.

 

(a)  Forward
Share Purchase. Subject to the conditions set forth in Section 4, on the date that is one (1) month after the closing of
the Business Combination (the “Business Combination Closing Date”), the Investors may elect to sell and transfer
to the Company, and the Company shall purchase from the Investors, up to that number of Shares (including any Additional Shares)
that are then held by the Investors, but not to exceed 750,000 Shares (including any Additional Shares) in the aggregate unless
otherwise agreed in writing by all Parties, at a price per Share equal to $10.2031 per Share (the “Shares Purchase
Price”). Each Investor shall, notify the Company and the Escrow Agent in writing five (5) Business Days (as defined below)
prior to the date that is one (1) month after the Business Combination Closing Date whether or not such Investor is exercising such
Investor’s right to sell any of the Shares (including any Additional Shares) held by such Investor to the Company pursuant to
this Agreement (each, a “Shares Sale Notice”). Any Investor that fails to timely deliver a Shares Sales Notice in
accordance with the immediately preceding sentence shall be deemed to have forfeited its right to sell any Shares (including any
Additional Shares) to the Company pursuant to this Agreement.

 

      

     

    

 

(b) Shares
Closing. If a Shares Sale Notice is timely delivered by any Investor to the Company and Escrow Agent, the closing of the sale of
the Shares contemplated in each such timely delivered Share Sales Notice (the “Shares Closing”) shall occur no
later than the date that is one (1) month after the Business Combination Closing Date (the “Shares Closing
Date”). On the Shares Closing Date, each selling Investor shall deliver, or cause to be delivered, the Shares (including
any Additional Shares) subject to the applicable Shares Sale Notice free and clear of all liens and encumbrances to Escrow Agent
and, in exchange therefor, the Escrow Agent shall deliver to each such selling Investor(s) an amount equal to (i) the Shares
Purchase Price multiplied by (ii) the number of Shares being sold by such selling Investor (with respect to any particular
selling Investor, the “Investor Shares Purchase Price”), which shall be paid by wire transfer of immediately
available funds from the Escrow Account. The Escrow Agent shall, (i) without delay, release from the Escrow Account to each selling
Investor on the Shares Closing Date, for such selling Investor’s use without restriction, an amount equal to such
Investor’s Investor Shares Purchase Price, and (ii) promptly deliver such sold Shares to the Company.

 

2. Representations and
Warranties of the Investors. Each Investor represents and warrants to Petra and the Company, severally and not jointly, as of
the date hereof:

 

(a)  Organization
and Power. Such Investor is duly organized, validly existing, and in good standing under the laws of the jurisdiction of its formation
and has all requisite power and authority to carry on its business as presently conducted and as proposed to be conducted.

 

(b)  Authorization.
Such Investor has full power and authority to enter into this Agreement. This Agreement, when executed and delivered by such Investor
will constitute the valid and legally binding obligation of such Investor enforceable against it in accordance with its terms, except
(i) as limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance and any other laws of general application
affecting enforcement of creditors’ rights generally, or (ii) as limited by laws relating to the availability of specific performance,
injunctive relief or other equitable remedies ((i) and (ii) collectively, the “Enforceability Exceptions”).

 

(c)  Governmental
Consents and Filings. No consent, approval, order or authorization of, or registration, qualification, designation, declaration or
filing with, any federal, state or local governmental authority is required on the part of such Investor in connection with the consummation
of the transactions contemplated by this Agreement (collectively, the “Transactions”) other than disclosure reports
regarding such transactions that such Investor is required to file in accordance with the terms of the Exchange Act (as defined below).

 

(d) Compliance
with Other Instruments. The execution, delivery and performance by such Investor of this Agreement and the consummation by such
Investor and the other Investors of the Transactions will not result in any violation or default (i) of any provisions of its
organizational documents, (ii) of any instrument, judgment, order, writ or decree to which it is a party or by which it is bound,
(iii) under any note, indenture or mortgage to which it is a party or by which it is bound, (iv) under any lease, agreement,
contract or purchase order to which it is a party or by which it is bound, or (v) of any provision of federal or state statute, rule
or regulation applicable to it, in each case (other than clause (i)), which would have a material adverse effect on such Investor or
any of the other Investors or its or their ability to consummate the Transactions.

 

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(e)  Shareholdings;
Share Purchase by Investors. As of the date of this Agreement, the Investors collectively hold [●] Shares, with each Investor’s
holdings of Shares set forth on Appendix A hereto. To the extent that the Investors hold less than 750,000 Shares as of the date
hereof, the Investors shall purchase prior to January 4, 2022 (the “Redemption Date”) such additional Shares
at or below trust value either (i) in the open market or (ii) from Petra’s public stockholders electing to redeem their shares such
that as of the Redemption Date the Investors shall collectively hold 750,000 Shares provided however, if less than 750,000 shares are
tendered for redemption; Investors’ aggregate obligation is to the number of shares tendered for redemption.

 

(f)  Disclosure
of Information. Such Investor has had an opportunity to discuss Petra’s and the Company’s business, management and financial
affairs, and the terms and conditions of this Agreement, as well as the terms of the Business Combination, with Petra’s management.

 

(g)  No
Other Representations and Warranties; Non-Reliance. Except for the specific representations and warranties contained in this Section
2 and in any certificate or written agreement delivered pursuant hereto, neither any Investor nor any person acting on behalf of such
Investor nor any of such Investor’s affiliates (collectively, the “Investor Parties”) has made, makes or shall
be deemed to make any other express or implied representation or warranty with respect to such Investor or the other Investors, and the
Investor Parties disclaim any such representation or warranty. Except for the specific representations and warranties expressly made by
Petra in Section 3 of this Agreement, in any certificate or written agreement delivered pursuant hereto and in any public filings,
the Investor Parties specifically disclaim that they are relying upon any other representations or warranties that may have been made
by the Petra Parties (as defined below).

 

 3. Representations and Warranties of Petra. Petra represents and warrants to each Investor as follows:

 

(a)  Organization
and Corporate Power. Petra is a corporation duly incorporated, validly existing and in good standing as a corporation under the laws
of Delaware and has all requisite corporate power and authority to carry on its business as presently conducted and as proposed to be
conducted. Petra has no subsidiaries other than the merger subsidiary referenced in the recitals hereto that was formed for the purpose
of effecting the Business Combination.

 

(b)  Authorization.
All corporate action required to be taken by Petra’s Board of Directors in order to authorize Petra to enter into this Agreement
has been taken. This Agreement, when executed and delivered by Petra, shall constitute the valid and legally binding obligation of Petra,
enforceable against Petra in accordance with its term, subject to the effect of the Enforceability Exceptions.

 

(c)  Disclosure.
Petra has not disclosed to either Investor material non-public information with respect to Petra or the Business Combination, other than
any such information that shall be publicly disclosed by Petra either by the issuance of a press release or the filing with the Commission
a Current Report on Form 8-K, in each case, by 9:00 a.m., Eastern Time on the first Business Day immediately following the date that the
Parties enter into this Agreement. Such public disclosure shall disclose the name of the Investors as having entered into the Agreement.

 

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(d)  Governmental
Consents and Filings. No consent, approval, order or authorization of, or registration, qualification, designation, declaration or
filing with, any federal, state or local governmental authority is required on the part of Petra in connection with the consummation of
the Transactions, other than disclosure reports regarding such transactions Petra is required to file in accordance with the terms of
the Exchange Act.

 

(e)  Compliance
with Other Instruments. The execution, delivery and performance by Petra of this Agreement and the consummation by Petra of the Transactions
will not result in any violation or default (i) of any provisions of its organizational documents, (ii) of any instrument, judgment, order,
writ or decree to which it is a party or by which it is bound, (iii) under any note, indenture or mortgage to which it is a party or by
which it is bound, (iv) under any lease, agreement, contract or purchase order to which it is a party or by which it is bound, or (v)
of any provision of federal or state statute, rule or regulation applicable to it, in each case (other than clause (i)), which would have
a material adverse effect on Petra or its ability to consummate the Transactions.

 

(f)  Adequacy
of Financing. The Company will have available to it sufficient funds to satisfy its obligations under this Agreement.

 

(g)  SEC
Filings. None of Petra’s reports and other filings with the Commission, as of their respective dates, contained any untrue statement
of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein, in light
of the circumstances under which they were made, not misleading.

 

(h)  No
Other Representations and Warranties; Non-Reliance. Except for the specific representations and warranties contained in this Section
3 and in any certificate or written agreement delivered pursuant hereto or in any public filings, neither Petra or any person on behalf
of Petra nor any of Petra’s affiliates (collectively, the “Petra Parties”) has made, makes or shall be deemed
to make any other express or implied representation or warranty with respect to Petra, the Company, the Transactions or the Business Combination,
and the Petra Parties disclaim any such representation or warranty. Except for the specific representations and warranties expressly made
by the Investors in Section 2 of this Agreement and in any certificate or agreement delivered pursuant hereto, the Petra Parties
specifically disclaim that they are relying upon any other representations or warranties that may have been made by the Investor Parties.

 

4.
Additional Agreements.

 

(a)  Net
Long Position. During the term of this Agreement, each Investor agrees to maintain a net long position of the Company’s securities.

 

(b)  No
Redemptions; No Tenders. Each Investor further agrees not to, (i) request redemption of any of the Shares (including any Additional
Shares) in conjunction with Petra’s shareholders’ approval of the Business Combination, or (ii) tender the Shares (including
any Additional Shares) to Petra in response to any redemption or tender offer that Petra may commence for its shares of common stock,
par value $0.001 per share (the “Common Stock”).

 

(c) Option
to Purchase Additional Shares and Certain Derivatives. Petra hereby acknowledges that nothing in this Agreement shall prohibit
the Investors from purchasing from third parties prior to the Business Combination Closing Date additional shares of Common Stock,
including shares that have previously been tendered by third parties for redemption at their original redemption value in
conjunction with Petra’s stockholders’ approval of the Business Combination, to the extent such third parties unwind
such tenders for redemption (the “Additional Shares”), or any warrants, convertible notes or options (including
puts or calls) of Petra; provided, the aggregate number of Shares and Additional Shares owned by the Investors and subject to Sections
1, 4(b) and 4(c) shall not exceed 750,000 shares of Common Stock, unless otherwise agreed in writing by all
Parties. For the avoidance of doubt, all Additional Shares shall be deemed Shares for all purposes hereunder and shall be purchased
by the Company in accordance with Section 1.

 

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(d)  Open
Market Sale. Notwithstanding anything to the contrary herein, the Parties agree that the Investors shall, commencing on the Business
Combination Closing Date, have the right, but not the obligation, to sell any or all of the Shares (including any Additional Shares) in
the open market if the sale price exceeds $10.2031 per Share prior to payment of any commissions due by the Investors for such sale.

 

 (e) Escrow.

 

(i)
Simultaneously with the closing of the Business Combination, Petra shall deposit, for good and valuable consideration, the receipt,
sufficiency and adequacy of which Petra hereby acknowledges, into an escrow account (the “Escrow Account”) with
Continental Stock Transfer & Trust Company (the “Escrow Agent”), subject to the terms of a written escrow
agreement (the “Escrow Agreement”) substantially in the form attached as Exhibit A hereto and to be
entered into on or prior to the Business Combination Closing Date, an amount equal to the lesser of (x) $7,652,325.00 and (y)
$10.2031 multiplied by the number of Shares and Additional Shares held by the Investors as of the closing of the Business
Combination, including after application of any ratable reduction as provided for in Section 4(a) (the “Escrowed
Funds”). The Escrow Agreement shall irrevocably cause the Escrow Agent to release from the Escrow Account the aggregate
Shares Purchase Price in accordance with Section 1. The payments to be made by the Escrow Agent to the Investors in
accordance with Section 1 or to the Investors and the Company in accordance with Section 4(d), if applicable, will be
made solely with the Escrowed Funds.

 

(ii)  Upon
receipt by the Escrow Agent and Company of written notice that any Investor has sold Shares above $10.2031 (including any Additional Shares)
as provided in Section 4(d), the Escrow Agent may release to the Company for the Company’s use without restriction an aggregate
amount equal to the number of Shares (including any Additional Shares) sold multiplied by $10.2031.

 

(iii)  In
the event that any Investor elects not to sell to the Company any Shares (including any Additional Shares) held by such Investor by either
(A) an Investor delivering a written notice to the Company on behalf of itself stating such Investor’s intention not to sell any
Shares (or any Additional Shares) to the Company, or (B) such Investor failing to timely deliver a Shares Sale Notice to the Company pursuant
to Section 1(a) for all of its Shares, the Company may promptly issue instructions to the Escrow Agent to release from the Escrow
Account to the Company for the Company’s use without restriction an amount equal to (x) $10.2031 multiplied by (y) the number
of Shares held by such Investor.

 

(f) Notification. The Company
shall promptly notify the Investors of the occurrence of any event that would make any of the representations and warranties of Petra
set forth in Section 3 untrue or incorrect at any time between the date of this Agreement and the Shares Closing Date.

 

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(g)  Security
Agreement in Escrow Account. To secure the obligations of Petra and the Company under this Agreement, Petra and the Company each grant
to the Investors a security interest in, and lien on, all right, title, and interest of Petra and the Company in and to the Escrow Account
in respect of all funds required to satisfy Petra’s and the Company’s obligations hereunder, the Escrow Agreement, all rights
related thereto, and all proceeds, products, and profits of the foregoing. In the event of a default by Petra or the Company under this
Agreement or the Escrow Agreement, then, in addition to any other rights the Investors may have under this Agreement, the Escrow Agreement,
and applicable law, the Investors shall also have the rights and remedies of a secured party under the Uniform Commercial Code as enacted
in the State of New York. Petra and the Company shall use commercially reasonable efforts to prepare and file such UCC financing statements
or other documents as reasonably directed by the Investors with respect to their security interests.

 

(h)  Indemnification.
Petra (referred to as the “Indemnitor”) agrees to indemnify the Investors and their respective officers, directors,
employees, agents and shareholders (collectively referred to as the “Indemnitees”) against, and hold them harmless
of and from, any and all loss, liability, cost, damage and expense, including without limitation, reasonable and documented out- of-pocket
outside counsel fees, which the Indemnitees may suffer or incur by reason of any action, claim or proceeding, in each case, brought by
a third party creditor of Petra, the Company or any of their respective subsidiaries asserting that the Investors are not entitled to
receive the aggregate Share Purchase Price or such portion thereof as they are entitled to receive pursuant to Section 1(a) and
Section 4(d) of this Agreement, in each case unless such action, claim or proceeding is the result of the fraud, bad faith, willful
misconduct or gross negligence of any Indemnitee.

 

5.  Closing
Conditions. The obligation of the Company to purchase the Shares at the Shares Closing under this Agreement shall be subject in all
respects to the consummation of the Business Combination and such Shares being free and clear of all liens and other encumbrances as of
the Shares Closing.

 

 6. Termination. This Agreement may be terminated as follows:

 

 (a) at any time by mutual written consent of all Parties;

 

(b)  at
the election of the Investors if the stockholders of Petra fail to approve the Business Combination before March 31, 2022, subject to
extension by mutual agreement; and

 

(c)  prior
to the closing of the Business Combination by mutual agreement of the Investors if there occurs a Company Material Adverse Effect (as
defined in the Business Combination Agreement).

 

(d)  By
the Investors, if prior to the Business Combination Meeting, all Parties, and Continental Stock Transfer & Trust Company, have not
executed the Escrow Agreement.

 

In the event
of termination in accordance with Section 6(a), 6(b), 6(c), or 6(d), this Agreement shall forthwith
become null and void and have no effect, without any liability on the part of MSOF, MCP, Petra, or the Company and their respective
directors, officers, employees, partners, managers, members, or stockholders and, except as otherwise provided in this Agreement,
all rights and obligations of each Party shall immediately cease; provided, however, that nothing contained in this Section
6 shall relieve any Party from liabilities or damages arising out of any actual fraud or willful breach by such party of any of
its representations, warranties, covenants or agreements contained in this Agreement prior to termination of this Agreement.

 

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7.
General Provisions.

 

(a)  Notices.
All notices and other communications given or made pursuant to this Agreement shall be in writing and shall be deemed effectively given
upon the earlier of actual receipt, or (i) personal delivery to the Party to be notified, (ii) when sent, if sent by electronic mail during
normal business hours of the recipient, and if not sent during normal business hours, then on the recipient’s next Business Day,
(iii) five (5) Business Days after having been sent by registered or certified mail, return receipt requested, postage prepaid, or (iv)
one (1) Business Day after deposit with a nationally recognized overnight courier, freight prepaid, specifying next Business Day delivery,
with written verification of receipt. All notices and other communications sent to a Party shall be sent to the e-mail address or address
as set forth on the signature page of such Party hereto, or to such e-mail address or address as subsequently modified by written notice
given by such Party in accordance with this Section 7(a).

 

(b)
No Finder’s Fees. Each Party represents that it neither is nor will be obligated for any finder’s fee or commission
in connection with the Transactions. Each Investor agrees to indemnify and to hold harmless Petra from any liability for any commission
or compensation in the nature of a finder’s or broker’s fee arising out of the Transactions (and the costs and expenses of
defending against such liability or asserted liability) for which the Investors, or any of their respective officers, employees or representatives
is responsible or arising out of any agreement entered into by any such person or entity. Petra agrees to indemnify and hold harmless
the Investors from any liability for any commission or compensation in the nature of a finder’s or broker’s fee arising out
of the Transactions (and the costs and expenses of defending against such liability or asserted liability) for which Petra or any of its
officers, employees or representatives is responsible or arising out of any agreement entered into by any such person or entity.

 

(c)  Survival
of Representations and Warranties. All of the representations and warranties contained herein shall survive the Shares Closing.

 

(d)  Entire
Agreement. This Agreement, together with any documents, instruments and writings that are delivered pursuant hereto or referenced
herein, constitute the entire agreement and understanding of the Parties in respect of its subject matter and supersedes all prior understandings,
agreements, or representations by or among the Parties, written or oral, to the extent they relate in any way to the subject matter hereof
or to the Transactions.

 

(e)  Successors.
All of the terms, agreements, covenants, representations, warranties, and conditions of this Agreement are binding upon, and inure to
the benefit of and are enforceable by, the Parties and their respective successors. Nothing in this Agreement, express or implied, is
intended to confer upon any party other than the Parties or their respective successors and assigns any rights, remedies, obligations
or liabilities under or by reason of this Agreement, except as expressly provided in this Agreement.

 

(f)  Assignments.
Except as otherwise specifically provided herein, no Party may assign either this Agreement or any of its rights, interests, or obligations
hereunder without the prior written approval of the each of the other Parties.

 

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(g)  Counterparts.
This Agreement may be executed in two or more counterparts, each of which will be deemed an original but all of which together will constitute
one and the same instrument. Signatures sent by facsimile transmission or in PDF format shall be deemed to be originals for all purposes
of this Agreement.

 

(h)  Headings.
The section headings contained in this Agreement are inserted for convenience only and will not affect in any way the meaning or interpretation
of this Agreement.

 

(i) Governing
Law; Jurisdiction. This Agreement, the entire relationship of the Parties, and any litigation among the Parties (whether
grounded in contract, tort, statute, law or equity) shall be governed by, construed in accordance with, and interpreted pursuant to
the laws of the State of Delaware, without giving effect to its choice of laws or conflict of law provision or rule (whether of the
State of Delaware or any other jurisdiction) that would cause the application of the laws of any jurisdiction other than the State
of Delaware. Any dispute arising from or relating to the relative rights of the parties hereto and all other questions concerning
the construction, validity and interpretation of this Agreement, shall be brought exclusively in the Court of Chancery of the State
of Delaware (the “Court of Chancery”) or, to the extent the Court of Chancery does not have subject matter
jurisdiction, the United States District Court for the District of Delaware and the appellate courts having jurisdiction of appeals
in such courts (the “Delaware Federal Court”) or, to the extent neither the Court of Chancery nor the Delaware
Federal Court has subject matter jurisdiction, the Superior Court of the State of Delaware (the “Chosen Courts”),
and, solely with respect to any such action (i) irrevocably submits to the exclusive jurisdiction of the Chosen Courts, (ii) waives
any objection to laying venue in any such action in the Chosen Courts, and (iii) waives any objection that the Chosen Courts are an
inconvenient forum or do not have jurisdiction over any party hereto.

 

(j)  MUTUAL
WAIVER OF JURY TRIAL. EACH PARTY TO THIS AGREEMENT HEREBY WAIVES ALL RIGHTS TO TRIAL BY JURY IN ANY ACTION, SUIT, OR PROCEEDING BROUGHT
TO RESOLVE ANY DISPUTE BETWEEN OR AMONG ANY OF THE PARTIES HERETO, WHETHER ARISING IN CONTRACT, TORT, OR OTHERWISE, ARISING OUT OF, CONNECTED
WITH, RELATED OR INCIDENTAL TO THIS AGREEMENT AND/OR THE TRANSACTIONS CONTEMPLATED HEREBY.

 

(k)  Amendments.
This Agreement may not be amended, modified or waived as to any particular provision, except with the prior written consent of all Parties.

 

(l)  Severability.
The provisions of this Agreement will be deemed severable and the invalidity or unenforceability of any provision will not affect the
validity or enforceability of the other provisions hereof; provided that if any provision of this Agreement, as applied to any
Party or to any circumstance, is adjudged by a governmental authority, arbitrator, or mediator not to be enforceable in accordance with
its terms, the Parties agree that the governmental authority, arbitrator, or mediator making such determination will have the power to
modify the provision in a manner consistent with its objectives such that it is enforceable, and/or to delete specific words or phrases,
and in its reduced form, such provision will then be enforceable and will be enforced.

 

(m)  Expenses.
At the Business Combination Closing Date, Petra shall pay the reasonable and documented out-of-pocket fees and expenses of legal counsel
to the Investors, in an amount not to exceed, in the aggregate $10,000. Petra and the Company are responsible for all fees associated
with the Escrow Account.

 

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(n)  Exclusivity.
Petra represents that it has not and will not enter into any similar agreements to this Agreement with any other parties prior to the
consummation of the Business Combination. For the avoidance of doubt, Petra may not enter into in any other non-redemption or forward
purchase agreement.

 

(o)  Construction.
The Parties have participated jointly in the negotiation and drafting of this Agreement. If an ambiguity or question of intent or interpretation
arises, this Agreement will be construed as if drafted jointly by the Parties and no presumption or burden of proof will arise favoring
or disfavoring any Party because of the authorship of any provision of this Agreement. For purposes of this Agreement, “Business
Day” means any day other than Saturday, Sunday, or a day on which commercial banks in New York are obligated by any applicable
law to close. Any reference to any federal, state, local, or foreign law will be deemed also to refer to law as amended and all rules
and regulations promulgated thereunder, unless the context requires otherwise. The words “include,” “includes,”
and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine,
and neuter genders will be construed to include any other gender, and words in the singular form will be construed to include the plural
and vice versa, unless the context otherwise requires. The words “this Agreement,” “herein,” “hereof,”
“hereby,” “hereunder,” and words of similar import refer to this Agreement as a whole and not to
any particular subdivision unless expressly so limited. The Parties intend that each representation, warranty, and covenant contained
herein will have independent significance. If a Party has breached any representation, warranty, or covenant contained herein in any respect,
the fact that there exists another representation, warranty or covenant relating to the same subject matter (regardless of the relative
levels of specificity) which such party has not breached will not detract from or mitigate the fact that such party is in breach of the
first representation, warranty, or covenant.

 

(p)  Waiver.
No waiver by a Party of any default, misrepresentation, or breach of warranty or covenant hereunder, whether intentional or not, may be
deemed to extend to any prior or subsequent default, misrepresentation, or breach of warranty or covenant hereunder or affect in any way
any rights arising because of any prior or subsequent occurrence.

 

(q)  Specific
Performance. Each Party agrees that irreparable damage may occur in the event any provision of this Agreement was not performed by
any other Party in accordance with the terms hereof and that the other Parties shall be entitled to seek specific performance of the terms
hereof, in addition to any other remedy at law or equity.

 

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 (r) Rule 10b5-1.

 

		i.	The Company represents and warrants to the Investors that Company
is not entering into this Agreement to create actual or apparent trading activity in the Shares (or any security convertible into or
exchangeable for the Shares) or to raise or depress or otherwise manipulate the price of the Shares (or any security convertible into
or exchangeable for the Shares) for the purpose of inducing the purchase or sale of such securities or otherwise in violation of the
Exchange Act, and the Company represents and warrants to the Investors that the Company has not entered into or altered, and agrees that
the Company will not enter into or alter, any corresponding or hedging transaction or position with respect to the Shares. The Company
acknowledges that it is the intent of the parties that this Agreement comply with the requirements of paragraphs (c)(1)(i)(A) and (B)
of Rule 10b5-1 under the Exchange Act (“Rule 10b5-1”) and this Agreement shall be interpreted to comply with the requirements
of Rule 10b5-1(c).

 

		ii.	The Company agrees that it will not seek to control or influence the Investors’
decision to make any “purchases or sales” (within the meaning of Rule 10b5- 1(c)(1)(i)(B)(3)) under this Agreement, including,
without limitation, the Investors’ decision to enter into any hedging transactions. The Investors represent and warrant that they
have consulted with their own advisors as to the legal aspects of its adoption and implementation of this Agreement under Rule 10b5-1.

 

		iii.	The Company acknowledges and agrees that any amendment, modification, waiver or
termination of this Agreement must be effected in accordance with the requirements for the amendment or termination of a “plan”
as defined in Rule 10b5-1(c). Without limiting the generality of the foregoing, the Company acknowledges and agrees that any such amendment,
modification, waiver or termination shall be made in good faith and not as part of a plan or scheme to evade the prohibitions of Rule
10b-5, and no such amendment, modification or waiver shall be made at any time at which the Company or any officer, director, manager
or similar person of the Company is aware of any material non- public information regarding the Company or the Shares.

 

[Signature page follows]

 

    10

     

    

 

IN WITNESS WHEREOF, the undersigned
have executed this Agreement to be effective as of the date first set forth above.

 

MSOF:

METEORA SPECIAL OPPORTUNITY FUND I, LP

 

	By:	/s/ Vik Mittal	 
	Name:	Vik Mittal	 
	Title:	CIO/Managing Member	 

 

Address for Notices:

4 Village Row, New Hope, Pennsylvania 18938

team@meteoracapital.com

 

MCP:

METEORA CAPITAL PARTNERS, LP

 

	By:	/s/ Vik Mittal	 
	Name:	Vik Mittal	 
	Title:	CIO/Managing Member	 

 

Address for Notices:

4 Village Row, New Hope, Pennsylvania 18938

team@meteoracapital.com

 

Petra:

Petra Acquisition, Inc.

 

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

 

Address for Notices:

[address]

[email]

 

    11

     

    

 

Appendix A

 

	Investor	 	Number of Shares	 
	Meteora Special Opportunity Fund I, LP	 	 	22,120	 
	Meteora Capital Partners, LP	 	 	12,108	 

 

    12

     

    

 

Exhibit A

 

Escrow Agreement

 

(attached hereto)

 

 

13Exhibit 10.3

 

ESCROW AGREEMENT

 

This ESCROW AGREEMENT
(this “Agreement”) made as of December 21, 2021, by and among Petra Acquisition, Inc. (“Petra”),
Continental Stock Transfer & Trust Company, 1 State Street, 30th Floor, New York, NY 10004 (the “Escrow Agent”),
Meteora Special Opportunity Fund I, LP (“MSOF”) and Meteora Capital Partners, LP (“MCP” and together
with MSOF, each individually an “Investor” and collectively, the “Investors”).

 

WITNESSETH:

 

WHEREAS, Petra has
entered into a Business Combination Agreement, dated as of August 29, 2021, (the “Business Combination Agreement”),
by and among Petra, Petra Acquisition Merger Inc., a Delaware corporation (“Merger Sub”), and Revelation Biosciences,
Inc., a Delaware Corporation (“Revelation”), pursuant to which Merger Sub will merge with and into Revelation, with
Revelation as the surviving company of that merger will merge with and into Petra (such transactions, the “Business Combination”).
Upon the consummation of the Business Combination, Petra will be renamed Revelation Biosciences, Inc. (Revelation Biosciences, Inc., as
the post-combination company shall be referred to herein as the “Company”). Petra has filed a definitive proxy statement
with the U.S. Securities and Exchange Commission (the “Commission”) that will seek, among other things, stockholder
approval of the Business Combination at a special meeting of shareholders (the “Business Combination Meeting”);

 

WHEREAS, Petra has
entered into that certain Forward Share Purchase Agreement, dated as of December 21, 2021 (as amended from time to time, the “Purchase
Agreement”), with MSOF and MCP, pursuant to which the Investors may elect to sell and transfer to the Company shares of common
stock, par value $0.001 per share of Petra (the “Shares”) that are held by the Investors at the date that is one (1)
month after the closing of the date of the Business Combination (the “Business Combination Closing Date”), at a price
per share of $10.2031 (the “Shares Purchase Price”) and may otherwise be entitled
to payments from the Company, all on the terms and conditions set forth in the Purchase Agreement;

 

WHEREAS, Petra desires
to establish an escrow account (the “Escrow Account”), into which, on the Business Combination Closing Date, Petra
shall deposit, or cause to be deposited, for good and valuable consideration, the receipt, sufficiency and adequacy of which Petra hereby
acknowledges, an amount equal to $7,652,325.00 (or such lesser amount as is provided for by Section 4(e) of the Purchase Agreement) (the
“Escrow Funds”), and the Escrow Agent is willing to establish the Escrow Account on the terms and subject to the conditions
hereinafter set forth; and

 

WHEREAS, the Escrow
Funds deposited into the Escrow Account are the funds of MSOF and MCP, and the parties hereto intend that, until the Escrow Funds are
released pursuant to this Agreement and the Purchase Agreement, the Escrow Funds are not, and shall not become under any circumstances,
property of the Company or Petra, it being understood and acknowledged that the Escrow Funds are to be held by the Escrow Agent in trust
for the exclusive benefit of MSOF and MCP; and

 

     

     

    

 

WHEREAS, the Escrow
Agent has agreed to establish a bank account (the “Bank Account”) at JPMorgan Chase Bank, N.A. (the “Bank”)
and an investment account (the “Investment Account” at a brokerage institution (the “Broker”) selected
by the Escrow Agent and bearing the designation set forth on the Information Sheet (as defined herein), into which the Escrow Funds are
to be deposited.

 

NOW, THEREFORE, in
consideration of the premises and mutual covenants herein contained, and for other good and valuable consideration, the receipt, sufficiency
and adequacy of which are hereby acknowledged, the parties hereto hereby agree as follows:

 

1. Establishment
of the Bank Account. The Escrow Agent shall establish the Bank Account at the branch of the Bank and an Investment Account at the
Broker selected by the Escrow Agent. The Escrow Agent, in a timely manner shall invest and reinvest the Escrow Funds in any open ended
investment company registered under the Investment Company Act of 1940, as amended (the “Investment Company Act”) that holds
itself out as a money market fund selected by Petra meeting the conditions of paragraphs (d)(2), (d)(3) and (d)(4) of Rule 2a-7 promulgated
under the Investment Company Act or any successor rule, which invests only in direct U.S. government treasury obligations, as determined
by Petra. The Escrow Agent may not invest in any other securities or assets, it being understood that the Bank Account will earn no interest
while the Escrow Funds are uninvested, the Escrow Agent may earn bank credits or other consideration during such periods The purpose of
the Bank Account and the Investment Account is for (a) the deposit of the Escrow Funds for the exclusive benefit of the Investors, and
(b) the disbursement of the Escrow Funds, all as described herein.

 

2. Deposits
to the Bank Account. Simultaneously with the closing of the Business Combination, Petra shall deposit an amount equal to the Escrow
Funds, from Petra’s Trust Account (as defined in the Trust Agreement (defined below), the “Trust Account”) with
the Escrow Agent as designated in Petra’s Trust Account closing funds flow statement into the Escrow Account, in accordance with
the terms of the Purchase Agreement and the Investment Management Trust Agreement, dated October 7, 2020, by and between Petra and the
Escrow Agent as trustee thereunder (“Trust Agreement”). If the amount of money in the Trust Account remaining after
paying redemptions to Petra public shareholders is less than the Escrow Funds, Petra shall transfer to the Escrow Agent an amount equal
to the Escrow Funds minus the funds remaining in the Trust Account after paying redemptions. For the avoidance of doubt, the amount transferred
pursuant to this section was property of Petra and upon transfer will be for the exclusive benefit of MSOF and MCP, subject to the terms
and conditions of this Agreement and the Purchase Agreement.

 

    2

     

    

 

		4.	Disbursement from the Escrow Account.

 

4.1 Concurrently
with an Investor’s electronic delivery of Shares to the Escrow Agent by Deposit/Withdrawal at Custodian (DWAC) and the
delivery of written instructions confirming the delivery of Shares to the Escrow Agent on the Shares Closing Date pursuant to
Section 1(b) of the Purchase Agreement including the timely delivery of the Shares Sales Notice, the Escrow Agent shall release to
the Investors from the Escrow Funds an amount equal to the Shares Purchase Price multiplied by the number of Shares delivered by
such Investor to the Escrow Agent on the Shares Closing Date; the Escrow Agent shall promptly disburse such amount without any fees
or setoffs and shall promptly deliver to the Company all such Shares delivered by the Investors to the Escrow Agent. If an Investor
fails to timely deliver a Shares Sale Notice to the Company and the Escrow Agent five (5) Business Days (as defined in the Purchase
Agreement) prior to the date that is one (1) month after the Business Combination Closing Date (as defined in the Purchase
Agreement) in accordance with Section 1(a) of the Purchase Agreement, the Escrow Agent shall release to the Company from the
Purchase Funds an amount equal to $10.2031 multiplied by the number of Shares held by such Investor. In the event that (i) an
Investor notifies the Company and the Escrow Agent that such Investor has sold Shares pursuant to Section 4(d) of the Purchase
Agreement, or (ii) an Investor notifies the Escrow Agent and the Company that an Investor does not intend to exercise such
Investor’s right to sell any of its Shares to the Company, the Escrow Agent shall release to the Company an amount equal to
the number of Shares sold by such Investor pursuant to Section 4(e) of the Purchase Agreement multiplied by the Shares
Purchase Price, in the case of clause (i) above, or to release to the Company an amount equal to the number of Shares held by such
non-selling Investor multiplied by the Shares Purchase Price, in the case of clause (ii) above, and the Escrow Agent shall
promptly disburse such Escrow Funds in accordance with the payment instructions provided by the Company. The Escrow Agent shall have
no duty to look beyond the instructions provided by the Investor in order to confirm the number of Shares held or sold. At any time
after the date that is five (5) Business Days prior to the date that is one (1) month after the Business Combination Closing Date,
the Company may deliver written instructions to the Escrow Agent to release to the Company all remaining Escrow Funds in the Escrow
Account after release to the applicable Investor(s) of (A) the Investor Shares Purchase Price (as such term is defined in the
Purchase Agreement) in respect of all Shares identified in all Shares Sale Notices that are timely delivered to the Company in
accordance with Section 1(a) of the Purchase Agreement and that are properly delivered to the Company on the Shares Closing Date in
accordance with Section 1(b) of the Purchase Agreement.

 

4.2 Upon
disbursement of the total of the Escrow Funds pursuant to the terms of this Section 4, the Escrow Agent shall be relieved of further
obligations and released from all liability under this Agreement. It is expressly agreed and understood that in no event shall the aggregate
amount of payments made by the Escrow Agent exceed the amount of the Escrow Funds.

 

5. Rights,
Duties and Responsibilities of Escrow Agent. It is understood and agreed that the duties of the Escrow Agent are purely ministerial
in nature, and that:

 

5.1 The
Escrow Agent shall not be responsible for or be required to enforce any of the terms or conditions of the Purchase Agreement or any other
agreement between MSOF and MCP and Petra (or the Company), nor shall the Escrow Agent be responsible for the performance by Petra, the
Company, MSOF or MCP of their respective obligations under this Agreement.

 

5.2 The Escrow
Agent shall be entitled to rely upon the accuracy, and act in reliance upon the contents, of any notice, instruction, certificate,
signature, instrument or other document which is given to the Escrow Agent pursuant to this Agreement that is believed by the Escrow
Agent to be genuine, without the necessity of the Escrow Agent verifying the truth or accuracy thereof. The Escrow Agent shall not
be obligated to make any inquiry as to the authority, capacity, existence or identity of any person purporting to give any such
notice or instructions or to execute any such certificate, instrument or other document. For the avoidance of doubt, this Section
shall not prevent any liability of the Escrow Agent for acts of willful misconduct or gross negligence as described in Section
5.4 herein.

 

    3

     

    

 

5.3 If
the Escrow Agent is uncertain as to its duties or rights hereunder or shall receive instructions with respect to the Bank Account or the
Escrow Funds which, in its sole determination, are in conflict either with other instructions received by it or with any provision of
this Agreement, it shall be entitled to hold the Escrow Funds, or a portion thereof, in the Bank Account pending the resolution of such
uncertainty to the Escrow Agent’s reasonable satisfaction.

 

5.4 The
Escrow Agent shall not be liable for any action taken or omitted hereunder, or for the misconduct of any employee, agent or attorney appointed
by it, except in the case of willful misconduct or gross negligence. The Escrow Agent shall be entitled to consult with counsel of its
own choosing and shall not be liable for any action taken, suffered or omitted by it in accordance with the advice of such counsel.

 

5.5 The
Escrow Agent shall have no responsibility at any time to ascertain whether or not any security interest exists in the Escrow Funds or
any part thereof.

 

6. Amendment;
Resignation or Removal of Escrow Agent. This Agreement may be altered or amended only pursuant to a written instrument, referencing
this Section 6, signed by all parties hereto. The Escrow Agent may resign and be discharged from its duties hereunder at any time
by giving written notice of such resignation to (i) Petra (if the resignation occurs prior to the closing of the Business Combination)
or the Company (if the resignation occurs after the closing of the Business Combination) and (ii) MSOF and MCP specifying a date when
such resignation shall take effect and upon delivery of the Escrow Funds to the successor escrow agent designated by MSOF or MCP in writing.
Such successor Escrow Agent shall become the Escrow Agent hereunder upon the resignation date specified in such notice. The Escrow Agent
shall continue to serve until its successor accepts the escrow and receives the Escrow Funds. MSOF and MCP shall jointly have the right
at any time to remove the Escrow Agent and substitute a new escrow agent by giving notice thereof to the Escrow Agent then acting, and
Petra or the Company. Upon its resignation and delivery of the Escrow Funds as set forth in this Section 6, the Escrow Agent shall
be discharged of and from any and all further obligations arising in connection with the escrow contemplated by this Agreement. Without
limiting the provisions of Section 8 hereof, the resigning Escrow Agent shall be entitled to be reimbursed by Petra or the Company,
as applicable, for any expenses incurred in connection with its resignation, transfer of the Escrow Funds to a successor escrow agent
or distribution of the Escrow Funds pursuant to this Section 6.

 

7. Representations
and Warranties. Petra hereby represents and warrants to the Escrow Agent and MSOF and MCP that:

 

7.1 No
party other than the parties hereto have or shall have, any lien, claim or security interest in the Escrow Funds or any part thereof.

 

    4

     

    

 

7.2 To
Petra’s knowledge, no financing statement under the Uniform Commercial Code or otherwise is on file in any jurisdiction claiming
a lien on, security interest in or describing (whether specifically or generally) the Escrow Funds or any part thereof.

 

7.3 All
of the information contained in the Information Sheet is, as of the date hereof, and will be, at the time of any disbursement of the Purchase
Funds, true and correct.

 

7.4 Reasonable
controls have been established and required due diligence performed to comply with “Know Your Customer” regulations, USA Patriot
Act, Office of Foreign Asset Control (OFAC) regulations and the Bank Secrecy Act.

 

8. Fees
and Expenses. The Escrow Agent shall be entitled to the Escrow Agent Fees set forth on the Information Sheet, payable as and when
stated therein by Petra (or the Company). For the avoidance of doubt, under no circumstances shall MSOF and/or MCP be responsible to pay
any portion of such Escrow Agent Fees.

 

 9. Indemnification and Contribution.

 

9.1 Subject to Section
18, Petra (referred to solely for purposes of this Section 9.1 as the “Indemnitor”) agrees to
indemnify the Escrow Agent and its officers, directors, employees, agents and shareholders (collectively referred to solely for
purposes of this Section 9.1 as the “Indemnitees”) against, and hold them harmless of and from, any and
all loss, liability, cost, damage and expense, including without limitation, reasonable counsel fees, which the Indemnitees may
suffer or incur by reason of any action, claim or proceeding brought against the Indemnitees arising out of or relating in any way
to this Agreement or any transaction to which this Agreement relates, unless such action, claim or proceeding is the result of the
fraud, willful misconduct or gross negligence of the Indemnitees.

 

9.2 Subject to Section
18, Petra and the Company (collectively referred to solely for purposes of this Section 9.2 as the “Indemnitor”)
agrees to indemnify the Investors and their respective officers, directors, employees, agents and shareholders (collectively referred
to solely for purposes of this Section 9.2 as the “Indemnitees”) against, and hold them harmless of and from,
any and all loss, liability, cost, damage and expense, including without limitation, reasonable and documented out-of-pocket outside
counsel fees, which the Indemnitees may suffer or incur by reason of any action, claim or proceeding, in each case, brought by a third
party creditor of the Petra, the Company or any of their respective subsidiaries against the Indemnitees arising out of or relating in
any way to the disbursement of any portion of the Escrow Funds to the Investors in accordance with the terms of this Agreement, unless
such action, claim or proceeding is the result of the fraud, bad faith, willful misconduct or gross negligence of any Indemnitee.

 

9.3 If the
indemnification provided for in Section 9.1 or Section 9.2 is applicable, but for any reason is held to be
unavailable, the Indemnitor, alone, shall contribute such amounts as are just and equitable to pay, or to reimburse the Indemnitees
for, the aggregate of any and all losses, liabilities, costs, damages and expenses, including counsel fees, actually incurred by the
Indemnitees (as defined in such applicable Section) as a result of or in connection with, and any amount paid in settlement of, any
action, claim or proceeding arising out of or relating in any way to any actions or omissions of the Indemnitors.

 

    5

     

    

 

9.4 The
provisions of this Section 9 shall survive any termination of this Agreement, whether by disbursement of the Escrow Funds, resignation
of the Escrow Agent or otherwise.

 

10. In
the event that Petra (or the Company) file a petition with any bankruptcy court or be the subject of any petition (a “Bankruptcy
Event”) filed under 11 U.S.C. § 101 et seq. (the “Bankruptcy Code”), Petra (or the Company) acknowledges
and agrees that the Escrow Funds in the Escrow Account are the exclusive property of the Investors and shall not constitute property of
the bankruptcy estate of Petra (or the Company), within the meaning of § 541 of the Bankruptcy Code. In the event that, notwithstanding
the foregoing, a bankruptcy court shall determine that Petra (or the Company) has a continuing right, title or interest in or to the Escrow
Fund in the Escrow Account, and that all or any portion of the Escrow Funds are property of the bankruptcy estate, Petra (or the Company)
hereby, for itself and on behalf of the Company, acknowledges and agrees that all such Escrow Funds in the Escrow Account shall constitute
the Investors’ “cash collateral” within the meaning of §§ 361 and 363 of the Bankruptcy Code. Petra (or the
Company) further acknowledges that in such event, the Investors do not consent to Petra’s (or the Company’s) use of such cash
collateral, and that Petra (or the Company) shall have no right to use or apply any amount of such cash collateral unless and until (i)
Petra (or the Company) shall have received a bankruptcy court order authorizing use of the same and (ii) the Investors shall have been
provided with “adequate protection” of their interests in the Escrow Funds in the Escrow Account, within the meaning of §§
361 and 363 of the Bankruptcy Code. Petra (or the Company), for itself and on behalf of the Company, hereby releases all power of dominion
and control over the Escrow Funds in the Escrow Account and acknowledges that it shall not have access to the Escrow Funds in the Escrow
Account, except as specifically provided in this Agreement. Petra (or the Company), for itself and on behalf of the Company, agrees that
neither Petra nor the Company will take any position at any time prior to or after a Bankruptcy Event that all or any portion of the Escrow
Funds are property of their respective bankruptcy estates. Petra (or the Company), for itself and on behalf of the Company, further agrees
that its employees and representatives will not assist a bankruptcy trustee, creditors’ committee or other estate representative
in any bankruptcy case or proceeding in efforts to establish that the Escrow Funds are property of the bankruptcy estate of either Petra
or the Company. For the avoidance of doubt, Petra (or the Company), for itself and on behalf of the Company, agrees and acknowledges that
(i) the Escrow Agent shall hold the Escrow Funds in trust for the benefit of the Investors pending the release of such Escrow Funds in
strict accordance with this Agreement and (ii) Petra deposited the Escrow Funds in the Escrow Account for good and valuable consideration.

 

11. Termination
of Agreement. This Agreement shall terminate on the earlier of the termination of the Purchase Agreement and the final disposition
of the Escrow Funds pursuant to Section 4, provided that the rights of the Escrow Agent and the obligations of the other parties
hereto under Section 9 shall survive the termination hereof and the resignation or removal of the Escrow Agent.

 

    6

     

    

 

12. Governing
Law and Assignment. This Agreement shall be construed in accordance with and governed by the laws of the State of New York,
without regard to the conflicts of laws principles thereof, and shall be binding, upon the parties hereto and their respective
successors and assigns; provided, however, that any assignment or transfer by any party of its rights under this
Agreement or with respect to the Escrow Funds shall be void as against the Escrow Agent unless (a) written notice thereof shall be
given to the Escrow Agent; and (b) the Escrow Agent shall have consented in writing to such assignment or transfer.

 

13. Notices.
All notices required to be given in connection with this Agreement shall be sent by electronic, registered or certified mail, return receipt
requested, or by hand delivery with receipt acknowledged, or by an Express Mail service, and addressed, if to Petra, at its address set
forth on the Information Sheet, if to the Escrow Agent, at its address set forth on the Information Sheet, to the attention of the Trust
Department, and if to MSOF or MCP, at their addresses included on its signature page hereto.

 

14. No
Third Party Beneficiaries. Nothing in this Agreement or in any instruction or document executed by any party in connection with the
transactions contemplated hereby shall create any rights in, or be deemed to have been executed for the benefit of, any person that is
not a party hereto or thereto or any successor or permitted assign of such a party.

 

15. Severability.
If any provision of this Agreement or the application thereof to any person or circumstance shall be determined to be invalid or unenforceable,
the remaining provisions of this Agreement or the application of such provision to persons or circumstances other than those to which
it is held invalid or unenforceable shall not be affected thereby and shall be valid and enforceable to the fullest extent permitted by
law.

 

16 Execution in
Several Counterparts. This Agreement may be executed in several counterparts or by separate instruments and by facsimile transmission
or by electronic mail in “portable document format” (“.pdf”) and all of such counterparts and instruments shall
constitute one agreement, binding on all of the parties hereto.

 

17. Entire
Agreement. This Agreement constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and
supersedes all prior agreements and understandings (written or oral) of the parties in connection therewith.

 

18. Waiver.
The Escrow Agent has no right of set-off or any other right, title, interest or claim of any kind (“Claim”) in, or
to any distribution of, the Trust Account (as defined in the Trust Agreement) and hereby agrees not to seek recourse, reimbursement, payment
or satisfaction for any Claim against the Trust Account for any reason whatsoever. The Escrow Agent hereby waives any and all Claims against
the Trust Account and any and all rights to seek access to the Trust Account.

 

19. Information
Sheet. The recitals to this Agreement and the information set forth on the information sheet which is attached to this Agreement as
Exhibit A (the “Information Sheet”) are incorporated by reference herein and made a part hereof.

 

[Remainder of page intentionally
left blank]

 

    7

     

    

 

IN WITNESS WHEREOF, the undersigned have executed this Agreement
as of the day and year first above written.

 

	 	ESCROW AGENT:
	 	CONTINENTAL STOCK TRANSFER & TRUST COMPANY
	 	 	 	 
	 	By:	      
	 	 	Name: 	                 
	 	 	Title:	 

 

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

 

	 	MSOF:	 
	 	Meteora Special Opportunity Fund I, LP
	 	 
	 	By:	/s/ Vik Mittal
	 	 	Name:	Vik Mittal
	 	 	Title:	CIO/Managing Member
	 	 	 	 
	 	MCP:  
	 	Meteora Capital Partners, LP  
	 	 
	 	By:	/s/ Vik Mittal
	 	 	Name:	Vik Mittal
	 	 	Title:	CIO/Managing Member

  

[Signature Page to Escrow Agreement]

 

     

     

    

 

EXHIBIT A

 

ESCROW AGREEMENT INFORMATION SHEET

 

	1.	The Company

                                   Name:

 

Tax Identification Number:

 

	2.	Title of Escrow Account:

 

Continental Stock Transfer & Trust Co. A/A/F
Petra Acquisition Escrow 2022

 

Wire to:

 

JP Morgan Chase Bank, NA

4 New York Plaza,
5th Floor

New York, NY 10004

ABA # 021000021 SWIFT Code: CHASUS33

A/C: Continental Stock Transfer & Trust Co. A/A/F Petra
Acquisition Escrow 2022

A/C NO.:

 

	3.	Escrow Agent Fees & Charges for an Investment Accunt: $

                                     Escrow Administration Services.

 

	4.	Addresses for Notices and Email

 

Continental Stock Transfer & Trust

1 State Street 30th
Floor

New York, NY 10004-1561

Fran Wolf – fwolf@continentalstock.com

Jaswinder Goraya
– jgoraya@continentalstock.com

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