149820-74-6 4-Pentynoic acid, 3-((4-((4-(aminoiminomethyl)phenyl)amino)-1,4-dioxobutyl)amino)-, ethyl ester, (S)- Ethyl-3S-((4-((4-(aminoiminomethyl)phenyl)amino)-1,4-dioxobutyl)amino)-4-pentynoate SC 54684A Xemilofiban