5-18-07-00006 (Beilstein Handbook Reference) 66701-25-5 BRN 1405664 E 64 E 64 (proteinase inhibitor) E-64 E64 Oxiranecarboxylic acid, 3-(((1-(((4-((aminoiminomethyl)amino)butyl)amino)carbonyl)-3-methylbutyl)amino)carbonyl)-, (2S-(2-alpha,3-beta(R*)))- Oxiranecarboxylic acid, 3-(((1-(((4-((aminoiminomethyl)amino)butyl)amino)carbonyl)-3-methylbutyl)amino)carbonyl)-, (2S-(2alpha,3beta(R*)))- Proteinase inhibitor E 64 Thiol protease inhibitor