1-Pyrrolidineacetic acid, alpha-(3-((aminoiminomethyl)amino)propyl)-2-carboxy-5-oxo-, (S-(R*,S*))- 86630-17-3 N-(4-((Aminoiminomethyl)amino)-1-carboxybutyl)-2-pyrrolidone-5-carboxylic acid Pyronopaline