74392-49-7 D-Phe-phe-arg-CH2Cl D-Phe-phe-arg-chloromethyl ketone Dppacmk FFRCK L-Phenylalaninamide, D-phenylalanyl-N-(4-((aminoiminomethyl)amino)-1-(chloroacetyl)butyl)-, (S)- Phe-phe-arg-CH2-Cl Phe-phe-arg-CK Phe-phe-arg-chloromethyl ketone Phenylalanyl-phenylalanyl-arginine chloromethyl ketone