1,3-Propanedioic acid, 2-(4-(diphenylmethyl)-1-piperazinyl)-, diethyl ester 149256-95-1 4-Benzhydryl piperazinyl-1-malonate d'ethyle [French] Diethyl 2-(4-(diphenylmethyl)-1-piperazinyl)-1,3-propanedioate