(S)-L-Prolyl-N-(4-((aminoiminomethyl)amino)-1-(chloroacetyl)butyl)-L-phenylalaninamide 65149-23-7 D-Phe-pro-arg-chloromethyl ketone FPRCK Fprmecl L-Phenylalaninamide, L-prolyl-N-(4-((aminoiminomethyl)amino)-1-(chloroacetyl)butyl)-, (S)- PPACK Phe-pro-arg-CH2-Cl Phe-pro-arg-CK Phenylalanyl-prolyl-arginine-chloromethyl ketone Phenylalanyl-prolyl-arginyl-chloromethane