1-((1-(4-Butoxyphenyl)-5-oxo-3-pyrrolidinyl)carbonyl)piperazine hydrochloride 38160-20-2 Piperazine, 1-((1-(4-butoxyphenyl)-5-oxo-3-pyrrolidinyl)carbonyl)-, hydrochloride p-Butoxyphenyl-1 oxo-2 piperazinocarbonyl-4 pyrrolidine chlorhydrate [French]