Document:

EX-10.8

 Exhibit 10.8 

TPG BIOTECH DRAFT 6/1/06 

August 7, 2006 
 PRIVATE &
CONFIDENTIAL 
 Robert F.G. Booth Ph.D. 
 [Home address]

 Dear Dr. Booth: 
 As you know, TPG
Biotechnology Partners II, L.P. (the “Fund”) intends to make a controlling investment in Virobay, Inc. (the “Company”). The Fund agrees that, to the extent it makes a controlling investment in the Company, you will be the
Executive Chairman of the Company. Your starting base salary will be $225,000 per annum, which will be subject to customary withholdings and will be payable in accordance with the Company’s customary payroll practices. 

You will be entitled to receive an equity interest in the Company to the extent you materially contribute to the Fund’s investment of
such company. Your initial equity interest in the Company will be in stock options representing 2.5% of the total equity of the Company on a fully diluted basis. Your participation in the equity of the Company will be subject to the terms and
conditions of any equity participation and incentive plans established by the Company from time to time. Specifically, the vesting schedule will be over four years. In addition, you will receive 100% accelerated vesting on a change of control
situation with a double trigger. 
 This offer of employment does not constitute an employment contract, and if you accept this offer, your
employment with the Company will be “at will.” This means your employment will not be for a specific term and, but rather your employment will be terminable at any time by you or the Company with or without reason or notice. 

If the foregoing is acceptable to you, please execute both copies of this letter agreement, retain one copy for your file, and return the
other copy to the undersigned. 
  

			
	Very truly yours,
	
	TPG BIOTECHNOLOGY PARTNERS II, L.P.
	By:	 	TPG Biotechnology GenPar II, L.P.,
		 	its General Partner
	By:	 	TPG Biotech Advisors II, LLC,
		 	its General Partner
		
	By:	 	  

		 	David A. Spuria, Vice President

	
	AGREED AND ACCEPTED:
	
	August 7, 2006
	
	 /s/ Robert F. G. Booth

	Robert F.G. Booth Ph.D.EX-10.9

 Exhibit 10.9 
  

					
		  		  	 David Karpf, M.D.
 [Home
address]

 Robert Booth 
 Virobay, Inc. 

1490 O’Brien Drive 
 Menlo Park, CA 94025 

USA 
 September 26th, 2011 

 

	Re:	Employment with Virobay, Inc. 

 Dear David, 

Virobay, Inc. (“Company” or the “Company”) is pleased to offer you the position of Chief Medical Officer, on the following terms. 

You will be responsible for directing clinical science and clinical operations within Virobay. You will report to me in this role. You will
work at our facility 1490 O’Brien Drive, Menlo Park, CA 94025, however, the Company may change your position reporting relationship, duties, and work location from time to time as it deems necessary. 

Your compensation will be $25,416.67 per month, less payroll deductions and all required withholdings. An annual performance bonus of up to
25% of your annual salary may be paid at the end of the year and will be decided by the compensation committee of the Board of Directors. You will be paid semi-monthly and you will be eligible for the standard Company benefits. Virobay, Inc. may
modify compensation and benefits from time to time as it deems necessary. 
 It will be recommended to the Company’s Board of Directors
that you be granted an option to purchase up to 450,638 shares of the Company’s Common Stock at the fair market value on the date of the grant (the “Option”). Twenty-Five percent (25%) shall vest on the one year anniversary of
your first day of employment with the Company and the remaining portion of the Option shall vest in equal monthly installments over the three years thereafter. The provisions of any stock option grant shall be subject to the provisions of the
Company’s standard form of Stock Option Agreement and Option Grant. 
 As a Company employee, you will be expected to abide by Company
rules and regulations, acknowledge in writing that you have read the Company’s Employee Handbook, and sign and comply with the attached Proprietary Information and Inventions Agreement which prohibits unauthorized use or disclosure of Company
proprietary information. 
 In your work for the Company, you will be expected not to use or disclose any confidential information,
including trade secrets, of any former employer or other person to 

 
whom you have an obligation of confidentiality. Rather, you will be expected to use only that information which is generally known and used by persons with training and experience comparable
to your own, which is common knowledge in the industry or otherwise legally in the public domain, or which is otherwise provided or developed by the Company. During our discussions about your proposed job duties, you assured us that you would be
able to perform those duties within the guidelines just described. 
 You agree that you will not bring onto Company premises any
unpublished documents or property belonging to any former employer or other person to whom you have an obligation of confidentiality. 
 You
may terminate your employment with Company at any time and for any reason whatsoever simply by notifying Company. Likewise, Company may terminate your employment at any time and for any reason whatsoever, with or without cause or advance notice. As
required by law, this offer is subject to satisfactory proof of your right to work in the United States. 
 This letter, together with your
Proprietary Information and Inventions Agreement and stock option agreement, forms the complete and exclusive statement of your employment agreement with Virobay, Inc. The employment terms in this letter supersede any other agreements or promises
made to you by anyone, whether oral or written. This letter agreement cannot be changed except in a writing signed by you and a duly authorized officer of the Company. 

Please sign and date this letter, and return it to me by October 21st, 2011, if you
wish to accept employment at Company under the terms described above. If you accept our offer, we would like you to start on October 24th, 2011 or soon thereafter. 

We look forward to your favorable reply and to a productive and enjoyable work relationship. 

 

	
	Sincerely,
	
	 /s/ Robert Booth

	Robert Booth, PhD
	CEO
	Virobay, Inc.

  

					
	Accepted:	 		 	
			
	 /s/ David Karpf
	 		 	 September 26, 2011

	David Karpf, M.D.	 		 	DateEX-10.10

 Exhibit 10.10 
  

					
		  		  	 Anantha Sudhakar
 [Home address]

 Robert Booth 
 Virobay, Inc. 

1490 O’Brien Drive 
 Menlo Park, CA 94025 

USA 
 May 18th, 2012     
  

	Re:	Employment with Virobay, Inc. 

 Dear Sudhakar, 

Virobay, Inc. (“Company” or the “Company”) is pleased to offer you the position of Vice President of CMC, on the following terms: 

You will be responsible for directing CMC activities within Virobay. You will report to me in this role. You will work at our facility 1490
O’Brien Drive, Menlo Park, CA 94025, however, the Company may change your position, reporting relationship, duties, and work location from time to time as it deems necessary. 

Your compensation will be $20,000 per month, less payroll deductions and all required withholdings. An annual performance bonus of up to 20%
of your annual salary may be paid at the end of the year and will be decided by the compensation committee of the Board of Directors. You will be paid semi-monthly and you will be eligible for the standard Company benefits. Virobay, Inc. may
modify compensation and benefits from time to time as it deems necessary. 
 It will be recommended to the Company’s Board of
Directors that you be granted an option to purchase up to 341,000 shares of the Company’s Common Stock at the fair market value on the date of the grant (the “Option”). Twenty-Five percent (25%) shall vest on the one year
anniversary of your first day of employment with the Company and the remaining, portion of the Option shall vest in equal monthly installments over the three years thereafter. The provisions of any stock option grant shall be subject to the
provisions of the Company’s standard form of Stock Option Agreement and Option Grant. 
 As a Company employee, you will be expected to
abide by Company rules and regulations, acknowledge in writing that you have read the Company’s Employee Handbook, and sign and comply with the Proprietary Information and Inventions Agreement which prohibits unauthorized use or disclosure
of Company proprietary information. 
 In your work for the Company, you will be expected not to use or disclose any confidential
information, including trade secrets, of any former employer or other person to whom you have an obligation of confidentiality. Rather, you will be expected to use 

 
only that information which is generally known and used by persons with training and experience comparable to your own, which is common knowledge in the industry or otherwise legally in the
public domain, or which is otherwise provided or developed by the Company. During our discussions about your proposed job duties, you assured us that you would be able to perform those duties within the guidelines just described. 

You agree that you will not bring onto Company premises any unpublished documents or property belonging to any former employer or other person
to whom you have an obligation of confidentiality. 
 You may terminate your employment with Company at any time and for any
reason whatsoever simply by notifying Company. Likewise, Company may terminate your employment at any time and for any reason whatsoever, with or without cause or advance notice. As required by law, this offer is subject to satisfactory
proof of your right to work in the United States. 
 This letter, together with your Proprietary Information and Inventions Agreement and
stock option agreement, forms the complete and exclusive statement of your employment agreement with Virobay, Inc. The employment terms in this letter supersede any other agreements or promises made to you by anyone, whether oral or written. This
letter agreement cannot be changed except in a writing signed by you and a duly authorized officer of the Company. 
 Please sign and
date this letter, and return it to me by May 23rd, 2012, if you wish to accept employment at Company under the terms described above. If you accept our offer, we would like you to,
start on June 6th, 2012 or soon thereafter. 
 We look forward to your favorable reply and to a
productive and enjoyable work relationship. 
  

	
	Sincerely,
	
	 /s/ Robert Booth

	Robert Booth, PhD
	CEO
	Virobay, Inc.

  

					
	Accepted:	 		 	
			
	 /s/ Anantha Sudhakar
	 		 	 May 23, 2012

	Anantha Sudhakar	 		 	Date

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