FORM 4
☒ Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Tan Bo		 2. Issuer Name and Ticker or Trading Symbol

Summit Healthcare Acquisition Corp. [ SMIHU ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    __X__ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
See Remarks
(Last)          (First)          (Middle)

C/O SUMMIT HEALTHCARE ACQUISITION CORP., UNIT 1101, 11TH FLOOR, 1 LYNDHURST TOWER		 3. Date of Earliest Transaction (MM/DD/YYYY)

3/16/2023
(Street)

CENTRAL, HONG KONG, K3 		 4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)        (State)        (Zip)
Rule 10b5-1(c) Transaction Indication
☐ Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)		8. Price of Derivative Security
(Instr. 5)		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Class B Ordinary Shares  (1)3/16/2023  D (2)(3)    5300000   (1) (1)Class A Ordinary Shares 5300000  (2)(3)0 I See Footnote (4)
Private Placement Warrants  (5)(6)3/16/2023  D (7)    6000000   (5)(6) (5)(6)Class A Ordinary Shares 6000000  (7)0 (7)I See Footnote (4)
Explanation of Responses:
(1) As described in the prospectus for the initial public offering (File No. 333-255722) of Summit Healthcare Acquisition Corp. ("SMIH") under the heading "Description of Securities--Founder Shares," the Class B ordinary shares, par value $0.0001 per share, will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, on a one-for-one basis, subject to adjustment for share splits, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.
(2) On March 16, 2023, pursuant to a Business Combination Agreement dated as of September 29, 2022 (the "Business Combination Agreement"), by and among SMIH, YishengBio Co., Ltd ("YS Biopharma"), Oceanview Bioscience Acquisition Co., Ltd., a direct wholly owned subsidiary of YS Biopharma ("Merger Sub I") and Hudson Biomedical Group Co., Ltd., a direct wholly owned subsidiary of YS Biopharma ("Merger Sub II"), (i) Merger Sub I merged with and into SMIH (the "First Merger"), with SMIH surviving the First Merger as the surviving entity (the "Surviving Entity") and remaining as a wholly-owned subsidiary of YS Biopharma and (ii) the Surviving Entity merged with and into Merger Sub II (the "Second Merger"), with Merger Sub II surviving the Second Merger as the surviving company (the "Surviving Company") and remaining as a wholly-owned subsidiary of YS Biopharma.
(3) (Continued from Footnote 2) Immediately before the effective time of the First Merger (the "First Merger Effective Time"), an aggregate of 1,446,525 Class B ordinary shares held by Summit Healthcare Acquisition Sponsor LLC, a Cayman Islands limited liability company (the "Sponsor") was surrendered for nil consideration, and after such surrender, each Class B ordinary share ceased to be outstanding and automatically converted into the right to receive one Ordinary Share of YS Biopharma.
(4) The Sponsor is the record holder of the shares reported herein. Bo Tan is one of the managers of the Sponsor and has voting and discretion with respect to the ordinary shares held of record by the Sponsor.
(5) Each Private Placement Warrant is exercisable to purchase one Class A ordinary share at an exercise price of $11.50 per share.
(6) As described in the prospectus for the initial public offering (File No. 333-255722) of SMIH under the heading "Description of Securities--Warrants," the Private Placement Warrants are identical to the warrants sold in connection with the Issuer's initial public offering and upon conversion of working capital loans, except that the Private Placement Warrants, so long as they are held by the Sponsor or its permitted transferees, (i) are not redeemable by the Issuer, (ii) may not (including the Class A ordinary shares of the Issuer issuable upon exercise of such warrants), subject to certain limited exceptions, be transferred, assigned or sold by until 30 days after the completion of the Issuer's initial business combination, (iii) may be exercised by the holders on a cashless basis and (iv) are entitled to registration rights.
(7) Immediately prior to the First Merger Effective Time, each whole Private Placement Warrant outstanding ceased to be a warrant with respect to Class A ordinary shares, and was assumed by YS Biopharma and converted into a warrant to purchase one YS Biopharma Ordinary Share, subject to substantially the same terms and conditions prior to the First Merger Effective Time.

Remarks:
Chief Executive Officer and Co-Chief Investment Officer

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Tan Bo
C/O SUMMIT HEALTHCARE ACQUISITION CORP.
UNIT 1101, 11TH FLOOR, 1 LYNDHURST TOWER
CENTRAL, HONG KONG, K3 		XXSee Remarks
Signatures
By: /s/ Bo Tan3/21/2023
**Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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