52795-16-1 Carbamic acid, (4-((aminoiminomethyl)amino)-1-(chloroacetyl)butyl)-, (4-nitrophenyl)methyl ester, (S)- alpha(N)-(4-Nitrobenzyloxycarbonylarginine chloromethyl ketone) alpha-Nitrobenzyloxycarbonyl-L-arginyl-chloromethyl ketone alpha-Nitrobenzyloxycarbonyl-arg-chloromethyl ketone