10141-07-8 2-Butenoic acid, 2-butenylidene ester, (E,E,E)- (8CI,9CI) 2-Butenylidene crotonate 4-02-00-01505 (Beilstein Handbook Reference) BRN 1708973 CROTONIC ACID, 2-BUTENYLIDENE ESTER Crotylidene dicrotonate