Blueprint
CONFIRMING
STATEMENT
This
Statement confirms that the undersigned has authorized and
designated each of Chris Schelling and Harry Palmin (each an
“attorney-in-fact”), each acting singly, to execute
and file or cause to be filed on the undersigned's behalf a Form ID
and all Forms 3, 4, and 5 (including any amendments thereto) that
the undersigned may be required to file with the U.S. Securities
and Exchange Commission as a result of the undersigned's ownership
of or transactions in securities of Acer Therapeutics Inc. The
undersigned hereby grants to each attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever
requisite, necessary or proper to be done in the exercise of any of
the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do personally present,
with full power of substitution, resubstitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or
such attorney’s-in-fact
substitute or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and powers herein
granted. The authority of each attorney-in-fact under this
Statement shall continue until the undersigned is no longer
required to file Forms 3, 4, and 5 with regard to the
undersigned’s ownership
of or transactions in securities of Acer Therapeutics Inc. unless
earlier revoked in writing. The undersigned acknowledges that none
of the attorneys-in-fact are assuming any of the
undersigned’s
responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.
This
Statement revokes the authority of any person named in any prior
confirming statement relating to the undersigned’s filing obligations with respect to
securities of Acer Therapeutics Inc. who is not named herein, and
this Statement replaces and supersedes any such prior confirming
statement.
Dated:
October 6,
2017
Signed:
/s/ Andrew
T. Williams
Print Name: Andrew T.
Williams