(E)-2-Butenoic acid methyl ester (E)-Crotonic acid methyl ester 2-Butenoic acid, methyl ester, (2E)- 2-Butenoic acid, methyl ester, (E)- 4-02-00-01500 (Beilstein Handbook Reference) 623-43-8 BRN 1720292 CROTONIC ACID, METHYL ESTER, (E)- EINECS 210-793-7 Methyl (E)-2-butenoate Methyl E-Propene-1-carboxylate Methyl E-crotonate Methyl crotonate Methyl trans-2-butenoate Methyl trans-crotonate trans-2-Butenoic acid methyl ester