1-Piperazinecarboxylic acid, 4-[2-(3,4-dichlorophenyl)acetyl]-3-(1-pyrrolidinylmethyl)-, methyl ester, (2E)-2-butenedioate (1:1)

1-Piperazinecarboxylic acid, 4-[2-(3,4-dichlorophenyl)acetyl]-3-(1-pyrrolidinylmethyl)-, methyl ester, (2E)-2-butenedioate (1:1)