2-04-00-00959 (Beilstein Handbook Reference) 73747-64-5 BRN 1787738 Diethylketomalonate dimethylhydrazone MALONIC ACID, OXO-, DIETHYL ESTER, DIMETHYLHYDRAZONE NSC 220029 Propanedioic acid, (dimethylhydrazono)-, diethyl ester (9CI)