saframycin B

N-[[(6S)-1,5,6,7,9,10,13,14,14aα,15-Decahydro-2,11-dimethoxy-3,12,16-trimethyl-1,4,10,13-tetraoxo-6α,15α-epimino-4H-isoquino[3,2-b][3]benzazocin-9β-yl]methyl]-2-oxopropionamide