2049-80-1 Diethyl 2-(prop-2-enyl)malonate Diethyl 2-allylmalonate Diethyl allylmalonate Diethyl prop-2-enylpropanedioate Ethyl allylmalonate Malonic acid, allyl-, diethyl ester NSC8777 Propanedioic acid, 2-propenyl-, diethyl ester