2-Butenoic acid, 2-methyl-, 2-methyl-2-propenyl ester, (2E)- 2-Butenoic acid, 2-methyl-, 2-methyl-2-propenyl ester, (E)- 2-Methylallyl 2-methylcrotonate 61692-82-8 EINECS 262-905-9