74985-82-3 9a-O-Methylmitomycin B AZIRINO(2',3':3,4)PYRROLO(1,2-a)INDOLE-4,7-DIONE, 1,1a,2,8,8a,8b-HEXAHYDRO-6,8a- Azirino(2',3':3,4)pyrrolo(1,2-a)indole-4,7-dione, 1,1a,2,8,8a,8b-hexahydro-6,8a-dimethoxy-1,5-dimethyl-8-(hydroxymethyl)-, carbamate BRN 5485913 Mitomycin J