Nafamostat Mesylate. A broad spectrum serine protease inhibitor, Synonyms: 4-[(Aminoiminomethyl)amino]benzoic acid 6-(aminoiminomethyl)-2-naphthalenyl ester dimethanesulfonate; FUT-175; Futhan, Purity: G97% by High-performance liquid chromatography, CAS Number: 82956-11-4, 50mg.