X0306 4 2017-09-19 0001069308 Acer Therapeutics Inc. ACER 0001533139 PALMIN HARRY S 222 THIRD STREET SUITE #2240 CAMBRIDGE MA 02142 true Chief Financial Officer Common Stock 2017-09-19 4 J false 125000 A 125000 D Received in connection with the Issuer's business combination (the "Merger") with what was then known as "Acer Therapeutics Inc." ("Private Acer") in accordance with the terms of the Agreement and Plan of Merger and Reorganization dated June 30, 2017 among the Issuer, Opexa Merger Sub, Inc. and Private Acer, in exchange for 125,000 shares of common stock of Private Acer. /s/ Daniel S. Clevenger, Attorney-in-Fact for Harry Palmin 2017-09-21