1-Cyanomethyl-2-(N-(gamma-carboxypropyl))iminopyrrolidine hydrochloride 4-((1-(Cyanomethyl)-2-pyrrolidinylidene)amino)butanoic acid monohydrochloride 91417-87-7 BUTANOIC ACID, 4-((1-(CYANOMETHYL)-2-PYRROLIDINYLIDENE)AMINO)-, MONOHYDROCHLORID Butanoic acid, 4-((1-(cyanomethyl)-2-pyrrolidinylidene)amino)-, monohydrochloride