Synonyms: 1H-Azirino[2,3-c][1]benzazocine-4,7,9(2H)-trione,1a,3,8,9a-tetrahydro-8-(hydroxymethyl)-6-methoxy-1,3,5-trimethyl-, carbamate(ester) (8CI); 1H-Azirino[2,3-c][1]benzazocine-4,7,9(2H)-trione,8-[[(aminocarbonyl)oxy]methyl]-1a,3,8,9a-tetrahydro-6-methoxy-1,3,5-trimethyl-,[1aS-(1aa,8a,9aa)]-; Mitomycin B, methyl-; N-Methylmitomycin B