mitomycin C(1-) alkylating agent mitomycin mitomycin C Ametycine MMC Mitomycin [(1aS,8S,8aR,8bS)-6-amino-8a-methoxy-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 Mutamycin Mitomycin C Mitocin-C 7-Amino-9alpha-methoxymitosane [(1aS,8S,8aR,8bS)-6-amino-8a-methoxy-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 antineoplastic agent