115290-74-9 Ata-fpr-CK L-Prolinamide, N-((acetylthio)acetyl)-D-phenylalanyl-N-(4-((aminoiminomethyl)amino)-1-(chloroacetyl)butyl)-, (S)- N(alpha)-((Acethylthio)acetyl)-phe-pro-arg-Ch2Cl N(alpha)-((Acetylthio)acetyl)-phenylalanyl-prolyl-arginine chloromethyl ketone