Synonyms: Butanamide,2-amino-N-[[7-cyano-5-[[1-[[[(7-cyano-1,5,6,7,9,10,13,14,14a,15-decahydro-2,11-dimethoxy-3,12,16-trimethyl-1,4,10,13-tetraoxo-6,15-imino-4H-isoquino[3,2-b][3]benzazocin-9-yl)methyl]amino]carbonyl]propyl]amino]-1,5,6,7,9,10,13,14,14a,15-decahydro-2,11-dimethoxy-3,12,16-trimethyl-1,4,10,13-tetraoxo-6,15-imino-4H-isoquino[3,2-b][3]benzazocin-9-yl]methyl]-,[5S-[5a[R*(6R*,7S*,9S*,14aR*,15S*)],6a,7a,9b(R*),14aa,15a]]-;6,15-Imino-4H-isoquino[3,2-b][3]benzazocine, butanamide deriv.; Saframycin Y2b-d;Butanamide,2-amino-N-[[(5S,6S,7R,9R,14aS,15R)-7-cyano-5-[[(1S)-1-[[[[(5S,6S,7R,9R,14aS,15R)-7-cyano-1,5,6,7,9,10,13,14,14a,15-decahydro-2,11-dimethoxy-3,12,16-trimethyl-1,4,10,13-tetraoxo-6,15-imino-4H-isoquino[3,2-b][3]benzazocin-9-yl]methyl]amino]carbonyl]propyl]amino]-1,5,6,7,9,10,13,14,14a,15-decahydro-2,11-dimethoxy-3,12,16-trimethyl-1,4,10,13-tetraoxo-6,15-imino-4H-isoquino[3,2-b][3]benzazocin-9-yl]methyl]-,(2S)- (9CI)