Exhibit 4.1

NUMBER SHARES COUNTERSIGNED: BROADRIDGE CORPORATE ISSUER SOLUTIONS, LLC TRANSFER AGENT BY: AUTHORIZED SIGNATURE DATED: INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE CUSIP 156944 10 0 SEE REVERSE FOR CERTAIN DEFINITIONS This Certifies That: is the owner of C O M M ON S T O C K CHIEF FINANCIAL OFFICER CHIEF EXECUTIVE OFFICER FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF $0.0001 PAR VALUE EACH OF CG Onco log y, Inc. transferable on the books of the Corporation by the holder thereof in person or by duly authorized attorney upon surrender of this certificate duly endorsed or assigned. This certificate and the shares represented hereby are subject to the laws of the State of Delaware, and to the Certificate of Incorporation and Bylaws of the Corporation, as now or hereafter amended. This certificate is not valid until countersigned by the Transfer Agent. WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. SPECIMEN SPECIMEN SPECIMEN—NOT NEGOTIABLE SPECIMEN not negotiable

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	under Uniform Gifts to Minors
	survivorship and not as tenants	Act ...................................................
	in common	(State)

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 TYPE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
	Shares
of the 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

	NOTICE: THE SIGNATURE 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 WHATSOEVER.
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 SEC Rule 17Ad-15.

THE CORPORATION WILL FURNISH TO ANY STOCKHOLDER, UPON REQUEST AND WITHOUT CHARGE, A FULL STATEMENT OF THE DESIGNATIONS, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF THE SHARES OF EACH CLASS AND SERIES AUTHORIZED TO BE ISSUED, SO FAR AS THE SAME HAVE BEEN DETERMINED, AND OF THE AUTHORITY, IF ANY, OF THE BOARD TO DIVIDE THE SHARES INTO CLASSES OR SERIES AND TO DETERMINE AND CHANGE THE RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF ANY CLASS OR SERIES. SUCH REQUEST MAY BE MADE TO THE SECRETARY OF THE CORPORATION OR TO THE TRANSFER AGENT NAMED ON THIS CERTIFICATE.

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