Document:

Form of stock option agreement

 Exhibit 10.2.2 
 Option No.                      

RIB-X PHARMACEUTICALS, INC. 
 Stock Option Grant Notice 
 Stock Option Grant under the Company’s

 2011 Equity Incentive Plan, as amended 
  

					
	1.	 	Name and Address of Participant:	  	  

		 		  	  

		 		  	  

			
	2.	 	Date of Option Grant:	  	  

			
	3.	 	Type of Grant:	  	  

			
	4.	 	Maximum Number of Shares for which this Option is exercisable:	  	  

			
	5.	 	Exercise (purchase) price per share:	  	  

			
	6.	 	Option Expiration Date:	  	  

			
	7.	 	Vesting Start Date:	  	  

		
	8.	 	Vesting Schedule: This Option shall become exercisable (and the Shares issued upon exercise shall be vested) as follows provided the Participant is an Employee,
director or Consultant of the Company or of an Affiliate on the applicable vesting date:

 [Insert Vesting Schedule - sample below] 

 

			
	 [On the first anniversary of
      the Vesting Start Date
	    	up to                  Shares
		
	 On the second anniversary of
      the Vesting Start Date
	    	an additional                  Shares
		
	 On the third anniversary of
      the Vesting Start Date
	    	an additional                  Shares]

 The foregoing rights are cumulative and are subject to the other terms and conditions of this Agreement
and the Plan. 

 The Company and the Participant acknowledge receipt of this Stock Option Grant Notice and
agree to the terms of the Stock Option Agreement attached hereto and incorporated by reference herein, the Company’s 2011 Equity Incentive Plan, as amended, and the terms of this Option Grant as set forth above. 

 

			
	Rib-X Pharmaceuticals, Inc.
		
	 By:
	 	  

	 Name:
	 	  

	 Title:
	 	  

	
	  

	Participant

  
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 RIB-X PHARMACEUTICALS, INC. 

STOCK OPTION AGREEMENT - INCORPORATED TERMS AND CONDITIONS 

AGREEMENT made as of the date of grant set forth in the Stock Option Grant Notice by and between Rib-X Pharmaceuticals, Inc. (the
“Company”), a Delaware corporation, and the individual whose name appears on the Stock Option Grant Notice (the “Participant”). 
 WHEREAS, the Company desires to grant to the Participant an Option to purchase shares of its common stock, $0.001 par value per share (the “Shares”), under and for the purposes set forth in the
Company’s 2011 Equity Incentive Plan, as amended (the “Plan”); 
 WHEREAS, the Company and the Participant
understand and agree that any terms used and not defined herein have the same meanings as in the Plan; and 
 WHEREAS, the
Company and the Participant each intend that the Option granted herein shall be of the type set forth in the Stock Option Grant Notice. 
 NOW, THEREFORE, in consideration of the mutual covenants hereinafter set forth and for other good and valuable consideration, the parties hereto agree as follows: 

1. GRANT OF OPTION. 
 The Company hereby grants to the Participant the right and option to purchase all or any part of an aggregate of the number of Shares set forth in the Stock Option Grant Notice, on the terms and
conditions and subject to all the limitations set forth herein, under United States securities and tax laws, and in the Plan, which is incorporated herein by reference. The Participant acknowledges receipt of a copy of the Plan. 

2. EXERCISE PRICE. 
 The exercise price of the Shares covered by the Option shall be the amount per Share set forth in the Stock Option Grant Notice, subject to adjustment, as provided in the Plan, in the event of a stock
split, reverse stock split or other events affecting the holders of Shares after the date hereof (the “Exercise Price”). Payment shall be made in accordance with Paragraph 9 of the Plan. 

3. EXERCISABILITY OF OPTION. 
 Subject to the terms and conditions set forth in this Agreement and the Plan, the Option granted hereby shall become vested and exercisable as set forth in the Stock Option Grant Notice and is subject to
the other terms and conditions of this Agreement and the Plan. 
 [Notwithstanding the foregoing, in the event of a Change of
Control (as defined [below] [in the Plan]),     % of the Shares which would have vested in each vesting installment remaining under this Option will be vested and exercisable for purposes of Paragraph [24(b)] of the Plan unless
this Option has otherwise expired or been terminated pursuant to its terms or the terms of the Plan. 

 Change of Control means the occurrence of any of the following events:

  

	 	(i)	Ownership. Any “Person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended) becomes the “Beneficial
Owner” (as defined in Rule 13d-3 under said Act), directly or indirectly, of securities of the Company representing 50% or more of the total voting power represented by the Company’s then outstanding voting securities (excluding for this
purpose any such voting securities held by the Company or its Affiliates or any employee benefit plan of the Company) pursuant to a transaction or a series of related transactions which the Board of Directors does not approve; or

  

	 	(ii)	Merger/Sale of Assets. (A) A merger or consolidation of the Company whether or not approved by the Board of Directors, other than a merger or consolidation
which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or the parent of such
corporation) more than 50% of the total voting power represented by the voting securities of the Company or such surviving entity or parent of such corporation, as the case may be, outstanding immediately after such merger or consolidation; or
(B) the sale or disposition by the Company of all or substantially all of the Company’s assets in a transaction requiring stockholder approval; or 

 

	 	(iii)	Change in Board Composition. A change in the composition of the Board of Directors, as a result of which fewer than a majority of the directors are Incumbent
Directors. “Incumbent Directors” shall mean directors who either (A) are directors of the Company as of [INSERT DATE], or (B) are elected, or nominated for election, to the Board of Directors
with the affirmative votes of at least a majority of the Incumbent Directors at the time of such election or nomination (but shall not include an individual whose election or nomination is in connection with an actual or threatened proxy contest
relating to the election of directors to the Company). 

  

	 	(iv)	“Change of Control” shall be interpreted, if applicable, in a manner, and limited to the extent necessary, so that it will not cause adverse tax
consequences under Section 409A of the Code.] 

  
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 4. TERM OF OPTION. 

This Option shall terminate on the Option Expiration Date as specified in the Stock Option Grant Notice and, if this Option is designated
in the Stock Option Grant Notice as an ISO and the Participant owns as of the date hereof more than 10% of the total combined voting power of all classes of capital stock of the Company or an Affiliate, such date may not be more than five years from
the date of this Agreement, but shall be subject to earlier termination as provided herein or in the Plan. 
 If the Participant
ceases to be an Employee, director or Consultant of the Company or of an Affiliate for any reason other than the death or Disability of the Participant, or termination of the Participant for Cause (the “Termination Date”), the Option to
the extent then vested and exercisable pursuant to Section 3 hereof as of the Termination Date, and not previously terminated in accordance with this Agreement, may be exercised within three months after the Termination Date, or on or prior to
the Option Expiration Date as specified in the Stock Option Grant Notice, whichever is earlier, but may not be exercised thereafter except as set forth below. In such event, the unvested portion of the Option shall not be exercisable and shall
expire and be cancelled on the Termination Date. 
 If this Option is designated in the Stock Option Grant Notice as an ISO and
the Participant ceases to be an Employee of the Company or of an Affiliate but continues after termination of employment to provide service to the Company or an Affiliate as a director or Consultant, this Option shall continue to vest in accordance
with Section 3 above as if this Option had not terminated until the Participant is no longer providing services to the Company. In such case, this Option shall automatically convert and be deemed a Non-Qualified Option as of the date that is
three months from termination of the Participant’s employment and this Option shall continue on the same terms and conditions set forth herein until such Participant is no longer providing service to the Company or an Affiliate. 

Notwithstanding the foregoing, in the event of the Participant’s Disability or death within three months after the Termination Date,
the Participant or the Participant’s Survivors may exercise the Option within one year after the Termination Date, but in no event after the Option Expiration Date as specified in the Stock Option Grant Notice. 

In the event the Participant’s service is terminated by the Company or an Affiliate for Cause, the Participant’s right to
exercise any unexercised portion of this Option even if vested shall cease immediately as of the time the Participant is notified his or her service is terminated for Cause, and this Option shall thereupon terminate. Notwithstanding anything herein
to the contrary, if subsequent to the Participant’s termination, but prior to the exercise of the Option, the Administrator determines that, either prior or subsequent to the Participant’s termination, the Participant engaged in conduct
which would constitute Cause, then the Participant shall immediately cease to have any right to exercise the Option and this Option shall thereupon terminate. 
 In the event of the Disability of the Participant, as determined in accordance with the Plan, the Option shall be exercisable within one year after the Participant’s termination of

  
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service due to Disability or, if earlier, on or prior to the Option Expiration Date as specified in the Stock Option Grant Notice. In such event, the Option shall be exercisable: 

 

	 	(a)	to the extent that the Option has become exercisable but has not been exercised as of the date of the Participant’s termination of service due to Disability; and

  

	 	(b)	in the event rights to exercise the Option accrue periodically, to the extent of a pro rata portion through the date of the Participant’s termination of service
due to Disability of any additional vesting rights that would have accrued on the next vesting date had the Participant not become Disabled. The proration shall be based upon the number of days accrued in the current vesting period prior to the date
of the Participant’s termination of service due to Disability. 

 In the event of the death of the
Participant while an Employee, director or Consultant of the Company or of an Affiliate, the Option shall be exercisable by the Participant’s Survivors within one year after the date of death of the Participant or, if earlier, on or prior to
the Option Expiration Date as specified in the Stock Option Grant Notice. In such event, the Option shall be exercisable: 
  

	 	(x)	to the extent that the Option has become exercisable but has not been exercised as of the date of death; and 

 

	 	(y)	in the event rights to exercise the Option accrue periodically, to the extent of a pro rata portion through the date of death of any additional vesting rights that
would have accrued on the next vesting date had the Participant not died. The proration shall be based upon the number of days accrued in the current vesting period prior to the Participant’s date of death. 

5. METHOD OF EXERCISING OPTION. 
 Subject to the terms and conditions of this Agreement, the Option may be exercised by written notice to the Company or its designee, in substantially the form of Exhibit A attached hereto (or
in such other form acceptable to the Company, which may include electronic notice). Such notice shall state the number of Shares with respect to which the Option is being exercised and shall be signed by the person exercising the Option (which
signature may be provided electronically in a form acceptable to the Company). Payment of the Exercise Price for such Shares shall be made in accordance with Paragraph 9 of the Plan. The Company shall deliver such Shares as soon as practicable after
the notice shall be received, provided, however, that the Company may delay issuance of such Shares until completion of any action or obtaining of any consent, which the Company deems necessary under any applicable law (including, without
limitation, state securities or “blue sky” laws). The Shares as to which the Option shall have been so exercised shall be registered in the Company’s share register in the name of the person so exercising the Option (or, if the Option
shall be exercised by the Participant and if the Participant shall so request in the notice exercising the Option, shall be registered in the 

  
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Company’s share register in the name of the Participant and another person jointly, with right of survivorship) and shall be delivered as provided above to or upon the written order of the
person exercising the Option. In the event the Option shall be exercised, pursuant to Section 4 hereof, by any person other than the Participant, such notice shall be accompanied by appropriate proof of the right of such person to exercise the
Option. All Shares that shall be purchased upon the exercise of the Option as provided herein shall be fully paid and nonassessable. 
 6. PARTIAL EXERCISE. 
 Exercise of this Option to the extent above stated
may be made in part at any time and from time to time within the above limits, except that no fractional share shall be issued pursuant to this Option. 
 7. NON-ASSIGNABILITY. 
 The Option shall not be transferable by the
Participant otherwise than by will or by the laws of descent and distribution. If this Option is a Non-Qualified Option then it may also be transferred pursuant to a qualified domestic relations order as defined by the Code or Title I of the
Employee Retirement Income Security Act or the rules thereunder. Except as provided above in this paragraph, the Option shall be exercisable, during the Participant’s lifetime, only by the Participant (or, in the event of legal
incapacity or incompetency, by the Participant’s guardian or representative) and shall not be assigned, pledged or hypothecated in any way (whether by operation of law or otherwise) and shall not be subject to execution, attachment or similar
process. Any attempted transfer, assignment, pledge, hypothecation or other disposition of the Option or of any rights granted hereunder contrary to the provisions of this Section 7, or the levy of any attachment or similar process upon the
Option shall be null and void. 
 8. NO RIGHTS AS STOCKHOLDER UNTIL EXERCISE. 

The Participant shall have no rights as a stockholder with respect to Shares subject to this Agreement until registration of the Shares in
the Company’s share register in the name of the Participant. Except as is expressly provided in the Plan with respect to certain changes in the capitalization of the Company, no adjustment shall be made for dividends or similar rights for which
the record date is prior to the date of such registration. 
 9. ADJUSTMENTS. 

The Plan contains provisions covering the treatment of Options in a number of contingencies such as stock splits and mergers. Provisions
in the Plan for adjustment with respect to stock subject to Options and the related provisions with respect to successors to the business of the Company are hereby made applicable hereunder and are incorporated herein by reference. 

  
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 10. TAXES. 
 The Participant acknowledges and agrees that (i) any income or other taxes due from the Participant with respect to this Option or the Shares issuable upon exercise of this Option shall be the
Participant’s responsibility; (ii) the Participant was free to use professional advisors of his or her choice in connection with this Agreement, has received advice from his or her professional advisors in connection with this Agreement,
understands its meaning and import, and is entering into this Agreement freely and without coercion or duress; (iii) the Participant has not received and is not relying upon any advice, representations or assurances made by or on behalf of the
Company or any Affiliate or any Employee of or counsel to the Company or any Affiliate regarding any tax or other effects or implications of the Option, the Shares or other matters contemplated by this Agreement and (iv) neither the
Administrator, the Company, its Affiliates, nor any of its officers or directors, shall be held liable for any applicable costs, taxes, or penalties associated with the Option if, in fact, the Internal Revenue Service were to determine that the
Option constitutes deferred compensation under Section 409A of the Code. 
 If this Option is designated in the Stock
Option Grant Notice as a Non-Qualified Option or if the Option is an ISO and is converted into a Non-Qualified Option and such Non-Qualified Option is exercised, the Participant agrees that the Company may withhold from the Participant’s
remuneration, if any, the minimum statutory amount of federal, state and local withholding taxes attributable to such amount that is considered compensation includable in such person’s gross income. At the Company’s discretion, the amount
required to be withheld may be withheld in cash from such remuneration, or in kind from the Shares otherwise deliverable to the Participant on exercise of the Option. The Participant further agrees that, if the Company does not withhold an amount
from the Participant’s remuneration sufficient to satisfy the Company’s income tax withholding obligation, the Participant will reimburse the Company on demand, in cash, for the amount under-withheld. 

11. PURCHASE FOR INVESTMENT. 
 Unless the offering and sale of the Shares to be issued upon the particular exercise of the Option shall have been effectively registered under the Securities Act of 1933, as now in force or hereafter
amended (the “1933 Act”), the Company shall be under no obligation to issue the Shares covered by such exercise unless the Company has determined that such exercise and issuance would be exempt from the registration requirements of the
1933 Act and until the following conditions have been fulfilled: 
  

	 	(a)	The person(s) who exercise the Option shall warrant to the Company, at the time of such exercise, that such person(s) are acquiring such Shares for their own respective
accounts, for investment, and not with a view to, or for sale in connection with, the distribution of any such Shares, in which event the person(s) acquiring such Shares shall be bound by the provisions of the following legend which shall be
endorsed upon any certificate(s) evidencing the Shares issued pursuant to such exercise: 

  
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 “The shares represented by this certificate have been taken for investment and they
may not be sold or otherwise transferred by any person, including a pledgee, unless (1) either (a) a Registration Statement with respect to such shares shall be effective under the Securities Act of 1933, as amended, or (b) the
Company shall have received an opinion of counsel satisfactory to it that an exemption from registration under such Act is then available, and (2) there shall have been compliance with all applicable state securities laws;” and 

(b) If the Company so requires, the Company shall have received an opinion of its counsel that the Shares may be issued upon such
particular exercise in compliance with the 1933 Act without registration thereunder. Without limiting the generality of the foregoing, the Company may delay issuance of the Shares until completion of any action or obtaining of any consent, which the
Company deems necessary under any applicable law (including without limitation state securities or “blue sky” laws). 

12. RESTRICTIONS ON TRANSFER OF SHARES. 
 12.1 The Shares acquired by the Participant pursuant to the exercise of the Option granted hereby shall not be transferred by the Participant except as permitted herein. 

12.2 In the event of the Participant’s termination of service for any reason, the Company shall have the option, but not the
obligation, to repurchase all or any part of the Shares issued pursuant to this Agreement (including, without limitation, Shares purchased after termination of service, Disability or death in accordance with Section 4 hereof). In the event the
Company does not, upon the termination of service of the Participant (as described above), exercise its option pursuant to this Section 12.2, the restrictions set forth in the balance of this Agreement shall not thereby lapse, and the
Participant for himself or herself, his or her heirs, legatees, executors, administrators and other successors in interest, agrees that the Shares shall remain subject to such restrictions. The following provisions shall apply to a repurchase under
this Section 12.2: 
  

	 	(i)	The per share repurchase price of the Shares to be sold to the Company upon exercise of its option under this Section 12.2 shall be equal to the Fair Market Value
of each such Share determined in accordance with the Plan as of the date of repurchase provided, however, in the event of a termination by the Company for Cause, the per share repurchase price of the Shares to be sold to the Company upon exercise of
its option under this Section 12.2 shall be equal to the lesser of the Exercise Price and the Fair Market Value on the date of the repurchase. 

  

	 	(ii)	The Company’s option to repurchase the Participant’s Shares in the event of termination of service shall be valid for a period of 12 months commencing with
the date of such termination of service. 

  

	 	(iii)	 In the event the Company shall be entitled to and shall elect to exercise its option to repurchase the Participant’s Shares under this
Section 12.2, the Company shall 

  
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notify the Participant, or in case of death, his or her Survivor, in writing of its intent to repurchase the Shares. Such written notice may be mailed by the Company up to and including the last
day of the time period provided for in Section 12.2(ii) for exercise of the Company’s option to repurchase. 

  

	 	(iv)	The written notice to the Participant shall specify the address at, and the time and date on, which payment of the repurchase price is to be made (the
“Closing”). The date specified shall not be less than ten days nor more than 60 days from the date of the mailing of the notice, and the Participant or his or her successor in interest with respect to the Shares shall have no further
rights as the owner thereof from and after the date specified in the notice. At the Closing, the repurchase price shall be delivered to the Participant or his or her successor in interest and the Shares being purchased, duly endorsed for transfer,
shall, to the extent that they are not then in the possession of the Company, be delivered to the Company by the Participant or his or her successor in interest. 

 12.3 It shall be a condition precedent to the validity of any sale or other transfer of any Shares by the Participant that the following restrictions be complied with (except as hereinafter otherwise
provided): 
  

	 	(i)	No Shares owned by the Participant may be sold, pledged or otherwise transferred (including by gift or devise) to any person or entity, voluntarily, or by operation of
law, except in accordance with the terms and conditions hereinafter set forth. 

  

	 	(ii)	 Before selling or otherwise transferring all or part of the Shares, the Participant shall give written notice of such intention to the Company, which
notice shall include the name of the proposed transferee, the proposed purchase price per share, the terms of payment of such purchase price and all other matters relating to such sale or transfer and shall be accompanied by a copy of the binding
written agreement of the proposed transferee to purchase the Shares of the Participant. Such notice shall constitute a binding offer by the Participant to sell to the Company such number of the Shares then held by the Participant as are proposed to
be sold in the notice at the monetary price per share designated in such notice, payable on the terms offered to the Participant by the proposed transferee (provided, however, that the Company shall not be required to meet any non-monetary terms of
the proposed transfer, including, without limitation, delivery of other securities in exchange for the Shares proposed to be sold). The Company shall give written notice to the Participant as to whether such offer has been accepted in whole by the
Company within 60 days after its receipt of written notice from the Participant. The Company may only accept such offer in whole and may not accept such offer in part. Such acceptance notice shall fix a time, location and date for the Closing on
such purchase (“Closing Date”) which shall not be less than ten nor more than sixty days after the giving of the acceptance notice, provided, however, if any of the Shares to be sold pursuant to this Section 12.3 have been held by the
Participant for less than six months, then the Closing Date may be extended by the Company until no more than ten days after such 

  
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Shares have been held by the Participant for six months if required under applicable accounting rules in effect at the time. The place for such Closing shall be at the Company’s principal
office. At such Closing, the Participant shall accept payment as set forth herein and shall deliver to the Company in exchange therefor certificates for the number of Shares stated in the notice accompanied by duly executed instruments of transfer.

  

	 	(iii)	If the Company shall fail to accept any such offer, the Participant shall be free to sell all, but not less than all, of the Shares set forth in his or her notice to
the designated transferee at the price and terms designated in the Participant’s notice, provided that (i) such sale is consummated within six months after the giving of notice by the Participant to the Company as aforesaid, and
(ii) the transferee first agrees in writing to be bound by the provisions of this Section 12 so that such transferee (and all subsequent transferees) shall thereafter only be permitted to sell or transfer the Shares in accordance with the
terms hereof. After the expiration of such six months, the provisions of this Section 12.3 shall again apply with respect to any proposed voluntary transfer of the Participant’s Shares. 

 

	 	(iv)	The restrictions on transfer contained in this Section 12.3 shall not apply to (a) transfers by the Participant to his or her spouse or children or to a trust
for the benefit of his or her spouse or children, (b) transfers by the Participant to his or her guardian or conservator, and (c) transfers by the Participant, in the event of his or her death, to his or her executor(s) or administrator(s)
or to trustee(s) under his or her will (collectively, “Permitted Transferees”); provided however, that in any such event the Shares so transferred in the hands of each such Permitted Transferee shall remain subject to this Agreement, and
each such Permitted Transferee shall so acknowledge in writing as a condition precedent to the effectiveness of such transfer. 

  

	 	(v)	The provisions of this Section 12.3 may be waived by the Company. Any such waiver may be unconditional or based upon such conditions as the Company may impose.

 12.4 In the event that the Participant or his or her successor in interest fails to deliver the Shares to be
repurchased by the Company under this Agreement, the Company may elect (a) to establish a segregated account in the amount of the repurchase price, such account to be turned over to the Participant or his or her successor in interest upon
delivery of such Shares, and (b) immediately to take such action as is appropriate to transfer record title of such Shares from the Participant to the Company and to treat the Participant and such Shares in all respects as if delivery of such
Shares had been made as required by this Agreement. The Participant hereby irrevocably grants the Company a power of attorney which shall be coupled with an interest for the purpose of effectuating the preceding sentence. 

12.5 If the Company shall pay a stock dividend or declare a stock split on or with respect to any of its Common Stock, or otherwise
distribute securities of the Company to the holders of its Common Stock, the number of shares of stock or other securities of the Company 

  
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issued with respect to the shares then subject to the restrictions contained in this Agreement shall be added to the Shares subject to the Company’s rights to repurchase pursuant to this
Agreement. If the Company shall distribute to its stockholders shares of stock of another corporation, the shares of stock of such other corporation, distributed with respect to the Shares then subject to the restrictions contained in this
Agreement, shall be added to the Shares subject to the Company’s rights to repurchase pursuant to this Agreement. 
 12.6
If the outstanding shares of Common Stock of the Company shall be subdivided into a greater number of shares or combined into a smaller number of shares, or in the event of a reclassification of the outstanding shares of Common Stock of the Company,
or if the Company shall be a party to a merger, consolidation or capital reorganization, there shall be substituted for the Shares then subject to the restrictions contained in this Agreement such amount and kind of securities as are issued in such
subdivision, combination, reclassification, merger, consolidation or capital reorganization in respect of the Shares subject immediately prior thereto to the Company’s rights to repurchase pursuant to this Agreement. 

12.7 The Company shall not be required to transfer any Shares on its books which shall have been sold, assigned or otherwise transferred
in violation of this Agreement, or to treat as owner of such Shares, or to accord the right to vote as such owner or to pay dividends to, any person or organization to which any such Shares shall have been so sold, assigned or otherwise transferred,
in violation of this Agreement. 
 12.8 The provisions of Sections 12.1, 12.2 and 12.3 shall terminate upon the effective date
of the registration of the Shares pursuant to the Securities Exchange Act of 1934. 
 12.9 The Participant agrees that in the
event the Company proposes to offer for sale to the public any of its equity securities and such Participant is requested by the Company and any underwriter engaged by the Company in connection with such offering to sign an agreement restricting the
sale or other transfer of Shares, then it will promptly sign such agreement and will not transfer, whether in privately negotiated transactions or to the public in open market transactions or otherwise, any Shares or other securities of the Company
held by him or her during such period as is determined by the Company and the underwriters, not to exceed 180 days following the closing of the offering, plus such additional period of time as may be required to comply with Marketplace Rule 2711 of
the National Association of Securities Dealers, Inc. or similar rules thereto (such period, the “Lock-Up Period”). Such agreement shall be in writing and in form and substance reasonably satisfactory to the Company and such underwriter and
pursuant to customary and prevailing terms and conditions. Notwithstanding whether the Participant has signed such an agreement, the Company may impose stop-transfer instructions with respect to the Shares or other securities of the Company subject
to the foregoing restrictions until the end of the Lock-Up Period. 
 12.10 The Participant acknowledges and agrees that neither
the Company, its shareholders nor its directors and officers, has any duty or obligation to disclose to the Participant any material information regarding the business of the Company or affecting the value of the Shares before, at the time of, or
following a termination of the service of the Participant by the Company, including, without limitation, any information concerning plans for the Company to make a public offering of its securities or to be acquired by or merged with or into another
firm or entity. 

  
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 12.11 All certificates representing the Shares to be issued to the Participant pursuant to
this Agreement shall have endorsed thereon a legend substantially as follows: “The shares represented by this certificate are subject to restrictions set forth in a Stock Option Agreement dated
            , 20     with this Company, a copy of which Agreement is available for inspection at the offices of the Company or will be made available upon
request.” 
 13. NO OBLIGATION TO MAINTAIN RELATIONSHIP. 

The Participant acknowledges that: (i) the Company is not by the Plan or this Option obligated to continue the Participant as an
Employee, director or Consultant of the Company or an Affiliate; (ii) the Plan is discretionary in nature and may be suspended or terminated by the Company at any time; (iii) the grant of the Option is a one-time benefit which does not
create any contractual or other right to receive future grants of options, or benefits in lieu of options; (iv) all determinations with respect to any such future grants, including, but not limited to, the times when options shall be granted,
the number of shares subject to each option, the option price, and the time or times when each option shall be exercisable, will be at the sole discretion of the Company; (v) the Participant’s participation in the Plan is voluntary;
(vi) the value of the Option is an extraordinary item of compensation which is outside the scope of the Participant’s employment or consulting contract, if any; and (vii) the Option is not part of normal or expected compensation for
purposes of calculating any severance, resignation, redundancy, end of service payments, bonuses, long-service awards, pension or retirement benefits or similar payments. 
 14. IF OPTION IS INTENDED TO BE AN ISO. 
 If this Option is designated in
the Stock Option Grant Notice as an ISO so that the Participant (or the Participant’s Survivors) may qualify for the favorable tax treatment provided to holders of Options that meet the standards of Section 422 of the Code then any
provision of this Agreement or the Plan which conflicts with the Code so that this Option would not be deemed an ISO is null and void and any ambiguities shall be resolved so that the Option qualifies as an ISO. The Participant should consult with
the Participant’s own tax advisors regarding the tax effects of the Option and the requirements necessary to obtain favorable tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements.

 Notwithstanding the foregoing, to the extent that the Option is designated in the Stock Option Grant Notice as an ISO and is
not deemed to be an ISO pursuant to Section 422(d) of the Code because the aggregate Fair Market Value (determined as of the Date of Option Grant) of any of the Shares with respect to which this ISO is granted becomes exercisable for the first
time during any calendar year in excess of $100,000, the portion of the Option representing such excess value shall be treated as a Non-Qualified Option and the Participant shall be deemed to have taxable income measured by the difference between
the then Fair Market Value of the Shares received upon exercise and the price paid for such Shares pursuant to this Agreement. 

  
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 Neither the Company nor any Affiliate shall have any liability to the Participant, or any
other party, if the Option (or any part thereof) that is intended to be an ISO is not an ISO or for any action taken by the Administrator, including without limitation the conversion of an ISO to a Non-Qualified Option. 

15. NOTICE TO COMPANY OF DISQUALIFYING DISPOSITION OF AN ISO. 

If this Option is designated in the Stock Option Grant Notice as an ISO then the Participant agrees to notify the Company in writing
immediately after the Participant makes a Disqualifying Disposition of any of the Shares acquired pursuant to the exercise of the ISO. A Disqualifying Disposition is defined in Section 424(c) of the Code and includes any disposition (including
any sale) of such Shares before the later of (a) two years after the date the Participant was granted the ISO or (b) one year after the date the Participant acquired Shares by exercising the ISO, except as otherwise provided in
Section 424(c) of the Code. If the Participant has died before the Shares are sold, these holding period requirements do not apply and no Disqualifying Disposition can occur thereafter. 

16. NOTICES. 
 Any notices required or permitted by the terms of this Agreement or the Plan shall be given by recognized courier service, facsimile, registered or certified mail, return receipt requested, addressed as
follows: 
 If to the Company: 
 Rib-X Pharmaceuticals, Inc. 
 300 George Street, Suite 301 

New Haven, CT 06511 
 Attention: Chief Executive Officer 
 If to the Participant at the address set forth on the Stock
Option Grant Notice 
 or to such other address or addresses of which notice in the same manner has previously been given. Any such notice shall
be deemed to have been given upon the earlier of receipt, one business day following delivery to a recognized courier service or three business days following mailing by registered or certified mail. 

17. GOVERNING LAW. 
 This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, without giving effect to the conflict of law principles thereof. For the purpose of litigating any
dispute that arises under this Agreement, the parties hereby consent to exclusive jurisdiction in Connecticut and agree that such litigation shall be conducted in the state courts of Connecticut or the federal courts of the United States for the
District of Connecticut. 

  
 12 

 18. BENEFIT OF AGREEMENT. 

Subject to the provisions of the Plan and the other provisions hereof, this Agreement shall be for the benefit of and shall be binding
upon the heirs, executors, administrators, successors and assigns of the parties hereto. 
 19. ENTIRE AGREEMENT.

 This Agreement, together with the Plan, embodies the entire agreement and understanding between the parties hereto with
respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. No statement, representation, warranty, covenant or agreement not expressly set forth in this
Agreement shall affect or be used to interpret, change or restrict, the express terms and provisions of this Agreement, provided, however, in any event, this Agreement shall be subject to and governed by the Plan. 

20. MODIFICATIONS AND AMENDMENTS. 
 The terms and provisions of this Agreement may be modified or amended as provided in the Plan. 
 21. WAIVERS AND CONSENTS. 
 Except as provided in the Plan, the terms and
provisions of this Agreement may be waived, or consent for the departure therefrom granted, only by written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall
constitute a waiver or consent with respect to any other terms or provisions of this Agreement, whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and
shall not constitute a continuing waiver or consent. 
 22. DATA PRIVACY. 

By entering into this Agreement, the Participant: (i) authorizes the Company and each Affiliate, and any agent of the Company or any
Affiliate administering the Plan or providing Plan recordkeeping services, to disclose to the Company or any of its Affiliates such information and data as the Company or any such Affiliate shall request in order to facilitate the grant of options
and the administration of the Plan; and (ii) authorizes the Company and each Affiliate to store and transmit such information in electronic form for the purposes set forth in this Agreement. 

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 

  
 13 

 Exhibit A 

NOTICE OF EXERCISE OF STOCK OPTION 
 [Form for Unregistered Shares] 
  

	To:	Rib-X Pharmaceuticals, Inc. 

 Ladies and
Gentlemen: 
 I hereby exercise my Stock Option to purchase
                 shares (the “Shares”) of the common stock, $0.001 par value, of Rib-X Pharmaceuticals, Inc. (the “Company”), at the exercise
price of $         per share, pursuant to and subject to the terms of that certain Stock Option Agreement between the undersigned and the Company dated
            , 20    . 
 I am
aware that the Shares have not been registered under the Securities Act of 1933, as amended (the “1933 Act”), or any state securities laws. I understand that the reliance by the Company on exemptions under the 1933 Act is predicated in
part upon the truth and accuracy of the statements by me in this Notice of Exercise. 
 I hereby represent and warrant that
(1) I have been furnished with all information which I deem necessary to evaluate the merits and risks of the purchase of the Shares; (2) I have had the opportunity to ask questions concerning the Shares and the Company and all questions
posed have been answered to my satisfaction; (3) I have been given the opportunity to obtain any additional information I deem necessary to verify the accuracy of any information obtained concerning the Shares and the Company; and (4) I
have such knowledge and experience in financial and business matters that I am able to evaluate the merits and risks of purchasing the Shares and to make an informed investment decision relating thereto. 

I hereby represent and warrant that I am purchasing the Shares for my own personal account for investment and not with a view to the sale
or distribution of all or any part of the Shares. 
 I understand that because the Shares have not been registered under the
1933 Act, I must continue to bear the economic risk of the investment for an indefinite time and the Shares cannot be sold unless the Shares are subsequently registered under applicable federal and state securities laws or an exemption from such
registration requirements is available. 
 I agree that I will in no event sell or distribute or otherwise dispose of all or any
part of the Shares unless (1) there is an effective registration statement under the 1933 Act and applicable state securities laws covering any such transaction involving the Shares or (2) the Company receives an opinion of my legal
counsel (concurred in by legal counsel for the Company) stating that such transaction is exempt from registration or the Company otherwise satisfies itself that such transaction is exempt from registration. 

  
 Exhibit A-1

 I consent to the placing of a legend on my certificate for the Shares stating that the
Shares have not been registered and setting forth the restriction on transfer contemplated hereby and to the placing of a stop transfer order on the books of the Company and with any transfer agents against the Shares until the Shares may be legally
resold or distributed without restriction. 
 I understand that at the present time Rule 144 of the Securities and Exchange
Commission (the “SEC”) may not be relied on for the resale or distribution of the Shares by me. I understand that the Company has no obligation to me to register the sale of the Shares with the SEC and has not represented to me that it
will register the sale of the Shares. 
 I understand the terms and restrictions on the right to dispose of the Shares set forth
in the 2011 Equity Incentive Plan, as amended, and the Stock Option Agreement, both of which I have carefully reviewed. I consent to the placing of a legend on my certificate for the Shares referring to such restriction and the placing of stop
transfer orders until the Shares may be transferred in accordance with the terms of such restrictions. 
 I have considered the
Federal, state and local income tax implications of the exercise of my Option and the purchase and subsequent sale of the Shares. 
 I am paying the option exercise price for the Shares as follows: 
  

 
 Please issue
the Shares (check one): 
  ̈ to me; or 

 ̈ to me and
                    , as joint tenants with right of survivorship 
 and mail the certificate to me at the following address: 
  

	
	  

	  

	  

  
 Exhibit A-2

 My mailing address for shareholder communications, if different from the address listed
above is: 
  

                         
                                    

                         
                                    

                         
                                    

 

	
	Very truly yours,
	
	  

	Participant (signature)
	
	  

	Print Name
	
	  

	Date
	
	  

	Social Security Number

  
 Exhibit A-3

 Exhibit B 

NOTICE OF EXERCISE OF STOCK OPTION 
 [Form for Shares Registered in the United States] 
  

	To:	Rib-X Pharmaceuticals, Inc. 

 IMPORTANT NOTICE:
This form of Notice of Exercise may only be used at such time as the Company has filed a Registration Statement with the Securities and Exchange Commission under which the issuance of the Shares for which this exercise is being made is registered
and such Registration Statement remains effective. 
 Ladies and Gentlemen: 
 I hereby exercise my Stock Option to purchase                      shares (the
“Shares”) of the common stock, $0.001 par value, of Rib-X Pharmaceuticals, Inc. (the “Company”), at the exercise price of $         per share, pursuant to and subject to the terms of
that Stock Option Grant Notice dated             , 20    . 
 I understand the nature of the investment I am making and the financial risks thereof. I am aware that it is my responsibility to have consulted with competent tax and legal advisors about the relevant
national, state and local income tax and securities laws affecting the exercise of the Option and the purchase and subsequent sale of the Shares. 
 I am paying the option exercise price for the Shares as follows: 
  

 
 Please issue the Shares (check
one): 
  ̈ to me; or 

 ̈ to me and
                    , as joint tenants with right of survivorship, 
 at the following address: 
  
                                  
                                         
                           
                                  
                                         
                           
                                  
                                         
                           

  
 Exhibit B-1

 My mailing address for shareholder communications, if different from the address listed
above, is: 
  

                      
                                         
                                      

                      
                                         
                                      

                      
                                         
                                      

 

	
	Very truly yours,
	
	  

	 Participant (signature)

	
	  

	 Print Name

	
	  

	 Date

	
	  

	 Social Security Number

  
 Exhibit B-2Form of restricted stock unit agreement

 Exhibit 10.2.3 
 Restricted Stock Unit No.                       

RIB-X PHARMACEUTICALS, INC. 
 Restricted Stock Unit Award Grant Notice 
 Restricted Stock Unit Award Grant
under the Company’s 
 2011 Equity Incentive Plan, as amended 

 

							
	1.	 	Name and Address of Participant:	  	  

		 		  	  

		 		  	  

			
	2.	 	Date of Grant of Restricted Stock Unit Award:	  	  

			
	3.	 	Maximum Number of Shares underlying Restricted Stock Unit Award:	  	  

		
	4.	 	Vesting of Award: This Restricted Stock Unit Award shall vest as follows provided the Participant is [an employee, director or Consultant / an employee / a director]
of the Company or of an Affiliate on the applicable vesting date:
				
	  	 	 Number of Restricted Stock Units
	  	  	  	 Vesting Date

				
		 	50% of the Maximum Number of Shares	  		  	            , 20    1/
				
		 	4.1667% of the Maximum Number of Shares	  		  	Every three months thereafter over the next three years

 Notwithstanding the foregoing, in the event of a merger, reorganization or other consolidation of the
Company, including the sale of substantially all of the Company’s assets, in which the Company is not the surviving entity and in which the persons holding the Company’s outstanding equity immediately prior to the transaction own less than
50% of the surviving entity’s total voting power immediately after the transaction, this Restricted Stock Unit Award shall fully vest and the Participant shall receive on the same day such event occurs such number of shares of Common Stock
equivalent to the number of Restricted Stock Units subject to this Restricted Stock Unit Award which have not yet vested under this Agreement. 
 The Company and the Participant acknowledge receipt of this Restricted Stock Unit Award Grant Notice and agree to the terms of the Restricted Stock Unit Agreement attached hereto and incorporated by
reference herein, the Company’s 2011 Equity Incentive Plan, as amended, and the terms of this Restricted Stock Unit Award as set forth above. 
  

			
	RIB-X PHARMACEUTICALS, INC.
		
	By:	 	  

	Name:	 	  

	Title:	 	  

	
	  

	Participant

  
  

	1/ 	 This date will be one year from the Triggering Event date as defined in the 2011 Bonus Plan. 

 RIB-X PHARMACEUTICALS, INC. 

RESTRICTED STOCK UNIT AGREEMENT - 
 INCORPORATED TERMS AND CONDITIONS 
 AGREEMENT made as of the date of
grant set forth in the Restricted Stock Unit Award Grant Notice between Rib-X Pharmaceuticals, Inc. (the “Company”), a Delaware corporation, and the individual whose name appears on the Restricted Stock Unit Award Grant Notice (the
“Participant”). 
 WHEREAS, the Company has adopted the Rib-X Pharmaceuticals, Inc. 2011 Equity Incentive Plan, as
amended (the “Plan”), to promote the interests of the Company by providing an incentive for employees, directors and Consultants of the Company and its Affiliates; 
 WHEREAS, pursuant to the provisions of the Plan, the Company desires to grant to the Participant restricted stock units (“RSUs”) related to the Company’s common stock, $0.001 par value per
share (“Common Stock”), in accordance with the provisions of the Plan, all on the terms and conditions hereinafter set forth; and 
 WHEREAS, the Company and the Participant understand and agree that any terms used and not defined herein have the meanings ascribed to such terms in the Plan. 

NOW, THEREFORE, in consideration of the premises and the mutual covenants contained herein and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 
 1. Grant of
Award. The Company hereby grants to the Participant the number of RSUs set forth in the Restricted Stock Unit Award Grant Notice (the “Award”) which represents a contingent entitlement of the Participant to receive shares of Common
Stock, on the terms and conditions and subject to all the limitations set forth herein and in the Plan, which is incorporated herein by reference. The Participant acknowledges receipt of a copy of the Plan. 

2. Vesting of Award. 
 (a) Subject to the terms and conditions set forth in this Agreement and the Plan, the Award granted hereby shall vest as set forth in the Restricted Stock Unit Award Grant Notice and is subject to the
other terms and conditions of this Agreement and the Plan. On each vesting date set forth in the Restricted Stock Unit Award Grant Notice, the Participant shall be entitled to receive such number of shares of Common Stock equivalent to the number of
RSUs set forth opposite such vesting date provided that the Participant is employed by [or engaged as a Consultant by] the Company or an Affiliate on such vesting date. Such shares of Common Stock shall thereafter be delivered by the Company to the
Participant within five days of the applicable vesting date and in accordance with this Agreement and the Plan. The purchase price is $0.001 per share payable if and when shares of Common Stock are issued by the Company, which payment will be made
by the Company on behalf of the Participant as compensation for the Participant’s prior service to the Company and which amount will be reported as income on the Participant’s W-2 (or other applicable form) in the year of payment.

 (b) Except as otherwise set forth in this Agreement, if the Participant ceases for any reason to be employed by [or engaged
as a Consultant by] the Company or an Affiliate (the “Termination”) prior to a vesting date set forth in the Restricted Stock Unit Award Grant Notice, then as of the date on which the Participant’s employment terminates, all unvested
RSUs shall immediately be forfeited to the Company and this Agreement shall terminate and be of no further force or effect. 

(c) Effect of a For Cause Termination. Notwithstanding anything to the contrary contained in this Agreement, in the event the
Company or an Affiliate terminates the Participant’s employment or service [(including as a Consultant)] for Cause, all of the RSUs then held by the Participant shall be forfeited to the Company immediately as of the time the Participant is
notified that he or she has been terminated for Cause or that he or she engaged in conduct which would constitute Cause and this Agreement shall terminate and be of no further force or effect. 

 3. Prohibitions on Transfer and Sale. This Award (including any additional RSUs
received by the Participant as a result of stock dividends, stock splits or any other similar transaction affecting the Company’s securities without receipt of consideration) shall not be transferable by the Participant otherwise than
(i) by will or by the laws of descent and distribution, or (ii) pursuant to a qualified domestic relations order as defined by the Internal Revenue Code or Title I of the Employee Retirement Income Security Act or the rules thereunder.
Except as provided in the previous sentence, the shares of Common Stock to be issued pursuant to this Agreement shall be issued, during the Participant’s lifetime, only to the Participant (or, in the event of legal incapacity or incompetence,
to the Participant’s guardian or representative). This Award shall not be assigned, pledged or hypothecated in any way (whether by operation of law or otherwise) and shall not be subject to execution, attachment or similar process. Any
attempted transfer, assignment, pledge, hypothecation or other disposition of this Award or of any rights granted hereunder contrary to the provisions of this Section 3, or the levy of any attachment or similar process upon this Award shall be
null and void. 
 4. Adjustments. The Plan contains provisions covering the treatment of RSUs and shares of Common Stock
in a number of contingencies such as stock splits. Provisions in the Plan for adjustment with respect to this Award and the related provisions with respect to successors to the business of the Company are hereby made applicable hereunder and are
incorporated herein by reference. 
 5. Securities Law Compliance. The Participant specifically acknowledges and agrees
that any sales of shares of Common Stock shall be made in accordance with the requirements of the Securities Act of 1933, as amended. The Company currently has an effective registration statement on file with the Securities and Exchange Commission
with respect to the Common Stock to be granted hereunder. The Company intends to maintain this registration statement but has no obligation to do so. If the registration statement ceases to be effective for any reason or there is a restriction under
foreign law, you will not be able to transfer or sell any of the shares of Common Stock issued to you pursuant to this Agreement unless exemptions from registration or filings under applicable securities laws are available. The Company shall not be
obligated to either issue the Common Stock or permit the resale of any shares of Common Stock if such issuance or resale would violate any applicable securities law, rule or regulation. 

6. Rights as a Stockholder. The Participant shall have no right as a stockholder, including voting and dividend rights, with
respect to the RSUs subject to this Agreement. 
 7. Incorporation of the Plan. The Participant specifically understands
and agrees that the RSUs and the shares of Common Stock to be issued under the Plan will be issued to the Participant pursuant to the Plan, a copy of which Plan the Participant acknowledges he or she has read and understands and by which Plan he or
she agrees to be bound. The provisions of the Plan are incorporated herein by reference. 
 8. Tax Liability of the
Participant and Payment of Taxes. The Participant acknowledges and agrees that any income or other taxes due from the Participant with respect to this Award or the shares of Common Stock to be issued pursuant to this Agreement or
otherwise sold shall be the Participant’s responsibility. Without limiting the foregoing, the Participant agrees that if under applicable law the Participant will owe taxes at each vesting date on the portion of the Award then vested the
Company shall be entitled to immediate payment from the Participant of the amount of any tax required to be withheld by the Company. Any taxes due shall be paid, at the option of the Company as follows: 

(a) through reducing the number of shares of Common Stock entitled to be issued to the Participant on the applicable vesting date in an
amount equal to the amount of minimum withholding tax due and payable by the Company. Fractional shares will not be retained to satisfy any portion of the withholding tax. Accordingly, the Participant agrees that in the event that the amount of
withholding owed would result in a fraction of a share being owed, that amount will be satisfied by withholding the fractional amount from the Participant’s paycheck; 

  
 2 

 (b) requiring the Participant to deposit with the Company an amount of cash equal to the
amount determined by the Company to be required with respect to the statutory minimum of the Participant’s estimated total federal, state and local tax obligations or otherwise withholding from the Participant’s paycheck an amount equal to
the withholding tax due and payable; or 
 (c) if the Company believes that the sale of shares can be made in compliance with
applicable securities laws, authorizing, at a time when the Participant is not in possession of material nonpublic information, the sale by the Participant on the applicable vesting date of such number of shares of Common Stock as the Company
instructs a registered broker to sell to satisfy the Company’s withholding obligation, after deduction of the broker’s commission, and the broker shall be required to remit to the Company the cash necessary in order for the Company to
satisfy its withholding obligation. To the extent the proceeds of such sale exceed the Company’s tax withholding obligation the Company agrees to pay such excess cash to the Participant as soon as practicable. In addition, if such sale is not
sufficient to pay the Company’s tax withholding obligation the Participant agrees to pay to the Company as soon as practicable, including through additional payroll withholding, the amount of any tax withholding obligation that is not satisfied
by the sale of shares of Common Stock. The Participant agrees to hold the Company and the broker harmless from all costs, damages or expenses relating to any such sale. The Participant acknowledges that the Company and the broker are under no
obligation to arrange for such sale at any particular price. In connection with such sale of shares of Common Stock, the Participant shall execute any such documents requested by the broker in order to effectuate the sale of shares of Common Stock
and payment of the withholding obligation to the Company. The Participant acknowledges that this paragraph is intended to comply with Section 10b5-1(c)(1(i)(B) under the Exchange Act. 

The Company shall not deliver any shares of Common Stock to the Participant until it is satisfied that all required withholdings have
been made. 
 9. Participant Acknowledgements and Authorizations. 

The Participant acknowledges the following: 
 (a) The Company is not by the Plan or this Award obligated to continue the Participant as [an employee, director or Consultant / an employee / a director] of the Company or of an Affiliate. 

(b) The Plan is discretionary in nature and may be suspended or terminated by the Company at any time. 

(c) The grant of this Award is considered a one-time benefit and does not create a contractual or other right to receive any other award
under the Plan, benefits in lieu of awards or any other benefits in the future. 
 (d) The Plan is a voluntary program of the
Company and future awards, if any, will be at the sole discretion of the Company, including, but not limited to, the timing of any grant, the amount of any award, vesting provisions and the purchase price, if any. 

(e) The value of this Award is an extraordinary item of compensation outside of the scope of any employment. As such the Award is not
part of normal or expected compensation for purposes of calculating any severance, resignation, redundancy, end of service payments, bonuses, long-service awards, pension or retirement benefits or similar payments. The future value of the shares of
Common Stock is unknown and cannot be predicted with certainty. 
 (f) The Participant (i) authorizes the Company and its
Affiliates or, if the Participant is not employed by the Company or an Affiliate, his or her employer, to furnish the Company and its Affiliates (and any agent administering the Plan or providing recordkeeping services) with such

  
 3 

 
information and data as it shall request in order to facilitate the grant of the Award and the administration of the Plan, (ii) waives any data privacy rights he or she may have with respect
to such information or the sharing of such information, and (iii) authorizes the Company and its Affiliates to store and transmit such information in electronic form. 
 10. Notices. Any notices required or permitted by the terms of this Agreement or the Plan shall be given by recognized courier service, facsimile, registered or certified mail, return receipt
requested, addressed as follows: 
 If to the Company: 
 Rib-X Pharmaceuticals, Inc. 
 300 George Street 

New Haven, CT 06511 
 Attention: Chief Financial Officer 
 If to the Participant at the address set forth
on the Restricted Stock Unit Award Grant Notice 
 or to such other address or addresses of which notice in the same manner has previously been
given. Any such notice shall be deemed to have been given on the earliest of receipt, one business day following delivery by the sender to a recognized courier service, or three business days following mailing by registered or certified mail.

 11. Assignment and Successors. 
 (a) This Agreement is personal to the Participant and without the prior written consent of the Company shall not be assignable by the Participant otherwise than by will or the laws of descent and
distribution. This Agreement shall inure to the benefit of and be enforceable by the Participant’s legal representatives. 

(b) This Agreement shall inure to the benefit of and be binding upon the Company and its successors and assigns. 

12. Governing Law. This Agreement shall be construed and enforced in accordance with the laws of the Delaware, without giving
effect to the conflict of law principles thereof. For the purpose of litigating any dispute that arises under this Agreement, whether at law or in equity, the parties hereby consent to exclusive jurisdiction in the state of Connecticut and agree
that such litigation shall be conducted in the state courts of Connecticut or the federal courts of the United States for the District of Connecticut. 
 13. Severability. If any provision of this Agreement is held to be invalid or unenforceable by a court of competent jurisdiction, then such provision or provisions shall be modified to the extent
necessary to make such provision valid and enforceable, and to the extent that this is impossible, then such provision shall be deemed to be excised from this Agreement, and the validity, legality and enforceability of the rest of this Agreement
shall not be affected thereby. 
 14. Entire Agreement. This Agreement, together with the Plan, constitutes the entire
agreement and understanding between the parties hereto with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. No statement, representation, warranty,
covenant or agreement not expressly set forth in this Agreement shall affect or be used to interpret, change or restrict the express terms and provisions of this Agreement provided, however, in any event, this Agreement shall be subject to and
governed by the Plan. 
 15. Modifications and Amendments; Waivers and Consents. The terms and provisions of this
Agreement may be modified or amended as provided in the Plan. Except as provided in the Plan, the 

  
 4 

 
terms and provisions of this Agreement may be waived, or consent for the departure therefrom granted, only by written document executed by the party entitled to the benefits of such terms or
provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other terms or provisions of this Agreement, whether or not similar. Each such waiver or consent shall be effective only in the
specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or consent. 
 16.
Section 409A. The Award of RSUs evidenced by this Agreement is intended to be exempt from the nonqualified deferred compensation rules of Section 409A of the Code as a “short term deferral” (as that term is used in the
final regulations and other guidance issued under Section 409A of the Code, including Treasury Regulation Section 1.409A-1(b)(4)(i)), and shall be construed accordingly. 

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