3-Carboxy-2,3-epoxypropionyl-leucylamido-(4-acetamido)butane 95499-84-6 Ac-Ep 459 Oxiranecarboxylic acid, 3-(((1-(((4-(acetylamino)butyl)amino)carbonyl)-3-methylbutyl)amino)carbonyl)-, (2S-(2alpha,3beta(R*)))-