5-<(4,5,6-trimethoxy-1H-indol-2-ylcarbonyl)amino>-1H-indole-2-carboxylic acid 以8.5 mg (50%)的产率得到dl-methyl 4-chloromethyl-8-hydroxy-2-trifluoromethyl-6-<5-<(4,5,6-trimethoxy-1H-indol-2-ylcarbonyl)amino>-1H-indol-2-ylcarbonyl>-1,4,5,6-tetrahydropyrrolo<3,2-e>indole-3-carboxylate