1-((1-(4-Ethoxyphenyl)-5-oxo-3-pyrrolidinyl)carbonyl)piperazine monohydrochloride 38160-03-1 Piperazine, 1-((1-(4-ethoxyphenyl)-5-oxo-3-pyrrolidinyl)carbonyl)-, monohydrochloride p-Ethoxyphenyl-1 oxo-2 piperazinocarbonyl-4 pyrrolidine chlorhydrate [French]