 N-[N-[0-[0-(aminoiminomethyl)phenyl]-0-oxopentyl]-L-xcex0-aspartyl]-L-phenylalanine, hydrochloride; N-[N-[0-[0-(aminoiminomethyl)phenyl]-0-oxopentyl]-L-xcex0-aspartyl]-L-phenylalanine, diethyl ester; N-[N-[0-[0-(aminoiminomethyl)phenyl]-0-oxopentyl]-L-xcex0-aspartyl]-L-phenylalanine, di