1 61E 4-(2-chlorophenyl)-8-[3-(dimethylamino)propoxy]-9-hydroxy-6-methylpyrrolo[3,4-C]carbazole-1,3(2h,6h)-dione 1.000 2 824 9-hydroxy-4-phenylpyrrolo[3,4-C]carbazole-1,3(2h,6h)-dione 0.735