759-65-9 Butanedioic acid, methyloxo-, diethyl ester Diethyl 2-methyl-3-oxosuccinate Diethyl 3-methyl-2-oxosuccinate Diethyl methyloxobutanedioate Ethyl .alpha.-ethoxalylpropionate NSC33946 Oxalacetic acid, methyl-, diethyl ester Propanoic acid, 2-(ethoxyoxoacetyl)-, ethyl ester