1-Cinnamyl-4-(ethoxycarbonyl)piperazine maleate 1-Piperazinecarboxylic acid, 4-(3-phenyl-2-propenyl)-, ethyl ester, (Z)-2-butenedioate (1:1) 82387-52-8 Ethyl 4-(3-phenyl-2-propenyl)-1-piperazinecarboxylate (Z)-2-butenedioate (1:1)