(E)-3-(1H-Indol-3-yl)-2-propenoic acid 2-propynyl ester 2-Propenoic acid, 3-(1H-indol-3-yl)-, 2-propynyl ester, (E)- 5-22-03-00250 (Beilstein Handbook Reference) 70882-54-1 BRN 0398737 Propargyl trans-beta-(3-indolyl)acrylate