74148-45-1 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-methylene-, (1aS-(1a-alpha,8a-alpha,8b-alpha))- Mitomycin K