EX-4.1





 Exhibit 4.1 

			
	 NUMBER

C-
	  	SHARES
	 SEE REVERSE FOR CERTAIN DEFINITIONS
	  	
		  	CUSIP _________

 eFFECTOR Therapeutics, Inc. 

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 

This Certifies that 
 is the owner of 

FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001 EACH OF THE CLASS A COMMON STOCK OF 

eFFECTOR Therapeutics, Inc. 

(THE “COMPANY”) 
 transferable on
the books of the Company in person or by duly authorized attorney upon surrender of this certificate properly endorsed. 
 This certificate is not valid
unless countersigned by the Transfer Agent and registered by the Registrar. 
 Witness the seal of the Company and the facsimile signatures of its duly
authorized officers. 
  

					
		  	[Corporate Seal]
Delaware	  	
	  
	  		  	  

	 Chief Executive Officer
	  		  	 Chief Financial Officer


 eFFECTOR Therapeutics, Inc. 

The Company will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, optional or
other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and shall be held
subject to all the provisions of the Company’s amended and restated certificate of incorporation and all amendments thereto and resolutions of the Board of Directors providing for the issue of securities (copies of which may be obtained from
the secretary of the Company), to all of which the holder of this certificate by acceptance hereof assents. 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 right of survivorship and not as tenants in common	  	                    	  	under Uniform Gifts to Minors Act
	 	 	 	  	 	  	 	  	(State)

 Additional abbreviations may also be used though not in the above list. 

For value received,                hereby sells, assigns and transfers unto

 (PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S)) 

(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S)) 

shares of the capital stock represented by the within Certificate, and hereby irrevocably constitutes and appoints Attorney to transfer the said stock on the
books of the within named Company with full power of substitution in the premises. 
  

	
	 Dated:


 NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY
PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER. 













	
	 Signature(s) Guaranteed:

	
	 By


 THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE).