1-Methyl-4-(2,4,4-trimethylallophanoyl)piperazine hydrochloride 1-Piperazinecarboxamide, N,4-dimethyl-N-((dimethylamino)carbonyl)-, monohydrochloride 80712-49-8 N-((Dimethylamino)carbonyl)-N,4-dimethyl-1-piperazinecarboxamide monohydrochloride