2-Methyl-3,4-pentadienoic acid, ethyl ester 3,4-Pentadienoic acid, 2-methyl-, ethyl ester 60523-21-9 BRN 1926000 EINECS 262-278-1 Ethyl 2-methyl-3,4-pentadienoate Ethyl 2-methylpenta-3,4-dienoate FEMA No. 3678