[(1aS,8S,8aR,8bS)-6,8a-Dimethoxy-5-methyl-4,7-dioxo-1,1a,2,4,7,8,8a,8b-octahydroazirino[2,3,4]pyrrolo[1,2-a]indol-8-yl]methyl Carbamate;[(1aS,8S,8aR,8bS)-6,8a-Dimethoxy-5-methyl-4,7-dioxo-1,1a,2,4,7,8,8a,8b-octahydroazirino[2,’3’:3,4]pyrrolo[1,2-a]indol-8-yl]methyl Carbamate;(1aS,8S,8aR,8bS)-8-[[(Aminocarbonyl)oxy]methyl]-1,1a,2,8,8a,8b-hexahydro-6,8a-dimethoxy-5-methylazirino[2',3':3,4]pyrrolo[1,2-a]indole-4,7-dione;((1aS,8S,8aR,8bS)-6,8a-dimethoxy-5-methyl-4,7-dioxo-1,1a,2,4,7,8,8a,8b-octahydroazirino[2,3:3,4]pyrrolo[1,2-a]indol-8-yl)methyl carbamate(WXG00529);Mitomycin EP Impurity B;Mitomycin Impurity 2(Mitomycin EP Impurity B)(Mitomycin A);Azirino[2',3':3,4]pyrrolo[1,2-a]indole-4,7-dione, 8-[[(aminocarbonyl)oxy]methyl]-1,1a,2,8,8a,8b-hexahydro-6,8a-dimethoxy-5-methyl-, (1aS,8S,8aR,8bS)-;Mitomycin EP Impurity B (Mitomycin A)