124325-93-5 1H-Pyrrolo(3,2-f)quinoline-2-carboxylic acid, 8-bromo-2,3,6,7,8,9-hexahydro-4-hydroxy-2-methyl-1-oxo-6-((5,6,7-trimethoxy-1H-indol-2-yl)carbonyl)-, methyl ester, (2R-trans)- Duocarmycin B1