1-((1-(4-Methylphenyl)-5-oxo-3-pyrrolidinyl)carbonyl)piperazine monohydrochloride 38160-17-7 Piperazine, 1-((1-(4-methylphenyl)-5-oxo-3-pyrrolidinyl)carbonyl)-, monohydrochloride p-Tolyl-1 oxo-2 piperazinocarbonyl-4 pyrrolidine chlorhydrate [French]