2-BUTENOIC ACID, 4,4'-(2-METHYL-1,4-PIPERAZINEDIYL)BIS(4-OXO-, DIETHYL ESTER 2-Methyl-1,4-bis(3-carbethoxy-1-oxo-2-propenyl)piperazine 36680-08-7 4,4'-(2-Methyl-1,4-piperazinediyl)bis(4-oxo-2-butenoic acid) diethyl ester 4,4'-(2-Methyl-1,4-piperazinodiyl)bis(4-oxo-1-propene-1-carboxylic acid diethyl ester) 5-23-03-00270 (Beilstein Handbook Reference) BRN 0575566 NSC 337310