Document:

Vuong
Trieu

4003
Jim Bowie

Agoura
Hills, CA 91301

 

November
15, 2016

 

Marina
Biotech, Inc.

P.O.
Box 1559

Bothell,
WA 98041

 

Re:
Line Letter

 

Dear
Sirs:

 

Vuong
Trieu (the “Lender”), hereby offers to Marina Biotech, Inc., a Delaware corporation (the “Borrower”),
an unsecured line of credit (the “Line”) in an amount not to exceed $540,000 (such amount, the “Maximum
Amount”). The proceeds of all advances under the Line will be used for current operating expenses of the Borrower, including
the payment of the premium for the annual continuation of the Borrower’s D&O liability insurance. At the request of
Lender, the Borrower shall inform the Lender of the intended use of proceeds of any advance under the Line.

 

The
Lender will respond promptly to any request for credit the Borrower may make. The Lender shall have the right at any time for
any reason in its sole and absolute discretion to terminate the Line or reduce the Maximum Amount without notice to the Borrower
or any other person. Notice of any such termination or reduction shall be effective immediately and shall permanently terminate
or reduce, as the case may be, the Maximum Amount then in effect. Notwithstanding the foregoing: (i) in the absence of a default
by Borrower hereunder, the Lender will not demand the repayment of any outstanding advance under the Line from the Borrower except
upon thirty business days’ notice; and (ii) Lender hereby agrees that it shall not demand the repayment of any advances
that have been made by the Lender to the Borrower hereunder prior to the earlier of: (x) the six (6) month anniversary of the
date of this letter; and (ii) the date on which the Borrower (A) makes a general assignment for the benefit of its creditors,
(B) applies for or consents to the appointment of a receiver, a custodian, a trustee or liquidator of all or a substantial part
of its assets or (z) ceases operations.

 

Any
credit which the Lender may extend will be on such terms and conditions and will bear interest at the rate stated in the promissory
note (as it may be amended, restated, supplemented or otherwise modified from time to time, the “Note”), substantially
in the form of Exhibit I attached hereto.

 

The
Lender will consider requests for advances under the Line until April 30, 2017, unless this discretionary line is earlier terminated
by the Borrower or the Lender. This line of credit is issued subject to the Lender in its sole discretion continuing to be satisfied
with the Borrower’s prospects, and the Borrower’s maintenance of a satisfactory relationship with the Lender.

 

    	 

    	 

    

 

This
letter is for the benefit of the Borrower only and is not to be shown to, or relied upon by, third parties. This letter constitutes
the entire understanding between the Borrower and the Lender on this subject and supersedes all prior discussions.

 

This
letter is the “Line Letter” referred to in the Note. This letter may be executed by one or more of the parties hereto
on any number of separate counterparts (including by facsimile transmission), and all of said counterparts taken together shall
be deemed to constitute one and the same instrument.

 

At
the end of the six months or exhaustion of the Line, the Lender shall have the right, exercisable by delivery of written notice
thereof to the Borrower (the “Election Notice”), to either: (i) receive repayment for the entire unpaid principal
amount of the Line and the accrued and unpaid interest thereon on the date of the delivery of the Election Notice or (ii) convert
the entire unpaid principal amount of the Line and the accrued and unpaid interest thereon into such number of shares of the Borrower’s
common stock as is equal to (x) the entire unpaid principal amount of the Line and the accrued and unpaid interest thereon on
the date of the delivery of the Election Notice by (y) the closing price of the Borrower’s common stock on the date of this
letter (such price, the “Conversion Price”, and the number of shares of common stock to be issued pursuant
to the foregoing formula, the “Conversion Shares”); provided, that in no event shall the Conversion
Price be lower than the lower of (x) $0.28 per share (as adjusted for stock splits occurring following the date of this letter)
or (y) the lowest exercise price of any securities of the Borrower that have been issued by the Borrower in a capital raising
transaction (and that would otherwise reduce the exercise price of any other outstanding warrants issued by the Borrower) during
the period between the date of this letter and the date of the delivery of the Election Notice.

 

The
Borrower shall, within thirty (30) days following the later of (x) the delivery of an Election Notice requesting the conversion
of the Line into Conversion Shares and (y) the date on which the Borrower files with the Securities and Exchange Commission (the
“Commission”) the audited financial statements (including pro forma financial statements) that are required
to be filed by the Borrower pursuant to Regulation S-X under the Securities Act of 1933, as amended, as a result of the consummation
of the merger contemplated by that certain Agreement and Plan of Merger dated as of even date herewith between and among the Borrower,
Ithena Acquisition Corporation, IthenaPharma Inc. and Vuong Trieu as the representative of IthenaPharma Inc. (such financial statements,
the “Required Financial Statements”), file with the Commission a registration statement to register the resale
of the Conversion Shares by the Lender on such form as the Borrower is eligible to use for such registration, and shall use its
best efforts to cause such registration statement to be declared effective by the Commission within sixty (60) days of the filing
thereof. The Borrower shall use commercially reasonable efforts to keep such registration statement effective at all times and
available for use by the Lender until the earlier of the time at which: (i) the Lender does not hold any Conversion Shares; or
(ii) all of the Conversion Shares are eligible for resale under Rule 144. The Borrower shall use commercially reasonable efforts
to cause the filing of the Required Financial Statements as soon as reasonably practicable following the date hereof, but in no
event later than seventy-five (75) days following the date hereof.

 

    	 

    	 

    

 

The
Lender acknowledges that the Conversion Shares constitute unregistered securities issued by the Borrower, and that the issuance
of the Conversion Shares by the Borrower is restricted under state and federal securities laws, including, without limitation,
the Securities Act of 1933, as amended (the “Securities Act”), and the rules and regulations promulgated thereunder.
The Lender agrees that it shall not sell the Conversion Shares (or any part thereof) unless the Conversion Shares have been registered
under the Securities Act, or unless such sale is permitted under, and is effected in compliance with, an exemption from registration
contained in applicable state and federal securities laws, including Rule 144 promulgated under the Securities Act (as such rule
may be amended from time to time). The Lender hereby represents and warrants to the Borrower that it: (i) is an “accredited
investor” as that term is defined in Regulation D promulgated under the Securities Act; (ii) has the requisite power and
authority to enter into and to perform its obligations under this letter; (iii) can bear the risk of losing its entire investment
in the Conversion Shares; (iv) is acquiring the Conversion Shares for its own account, not as nominee or agent, and not with a
view to, or for resale in connection with, any distribution or public offering thereof within the meaning of the Securities Act;
(v) understands that the Conversion Shares are being issued to it pursuant to an exemption from registration, based in part upon
the Borrower’s reliance upon the statements and representations made by the Lender in this letter; (vi) has such knowledge
and experience in financial or business matters that it is capable of evaluating the merits and risks of the acquisition of the
Conversion Shares; (vii) has been given the opportunity to ask questions of, and receive answers from, the Borrower concerning
the Conversion Shares and the business of the Borrower, and to obtain such additional information as the Lender deemed necessary
in connection with the transactions contemplated by this letter; and (viii) the Lender is not subject to the “bad actor”
disqualification provisions set forth in Rule 506(d) of Regulation D promulgated under the Securities Act.

 

Please
acknowledge your understanding of the above by signing and returning the enclosed copy of this letter.

 

	 	Very truly yours,
	 	 	 
	 	By:	/s/
    Vuong Trieu
	 	Name:	Vuong Trieu

 

	ACKNOWLEDGED AND AGREED AS 
	OF THE DATE FIRST ABOVE WRITTEN:
	 	 
	MARINA
    BIOTECH, INC.	 
	 	 
	By:	/s/
    Joseph W. Ramelli	 
	Name:	Joseph     W. Ramelli	 
	Title:	Interim CEO	 

 

    	 

    	 

    

 

EXHIBIT
I

 

Form
of NoteExhibit 4.1

 

 

NUMBER CERT. XXX
Polar Power, Inc. SHARES XXXXXXXXX INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE $0.0001 PAR VALUE COMMON STOCK CUSIP 73102V105
COMMON STOCK THIS CERTIFIES THAT * SPECIMEN * Is The Owner of XXXXXXXXX FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF
Polar Power, Inc. Transferable on the books of the Corporation in person or by duly authorized attorney upon surrender of this
Certificate properly endorsed. This Certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar.
Dated: ********* COUNTERSIGNED AND REGISTERED: VSTOCK TRANSFER, LLC Transfer Agent and Registrar Arthur D. Sams President and
Secretary By: AUTHORIZED SIGNATURE

 

     

     

    

 

 

The following abbreviations,
when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according
to applicable laws or regulations. TEN COM - as tenants in common UNIF GIFT MIN ACT Custodian TEN ENT - as tenants by the entireties
(Cust) (Minor) JT TEN - as joint tenants with the right of Act survivorship and not as tenants (State) in common Additional abbreviations
may also be used though not in the above list. For value received, hereby sell, assign and transfer unto PLEASE INSERT SOCIAL
SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE: (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
shares of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint , Attorney
to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises. Dated
X THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THIS CERTIFICATE. THE SIGNATURE(S)
MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions).
SIGNATURE GUARANTEED: TRANSFER FEE WILLAPPLY

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