X0306 4 2017-09-19 0001069308 Acer Therapeutics Inc. ACER 0001717241 Schelling Chris 222 THIRD STREET SUITE #2240 CAMBRIDGE MA 02142 true true President and CEO Common Stock 2017-09-19 4 J false 1750000 A 1750000 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 1,750,000 shares of common stock of Private Acer. /s/ Daniel S. Clevenger, Attorney-in-Fact for Chris Schelling 2017-09-21