2-Butenoic acid, 2-methyl-, 2-methyl-2-propenyl ester, (2Z)- 2-Butenoic acid, 2-methyl-, 2-methyl-2-propenyl ester, (Z)- 2-Methylallyl 2-methylisocrotonate 61692-78-2 EINECS 262-901-7 Methallyl angelate