5 8 dihydroindolo 2 3 c carbazole July 8, 2019 16 32 64 128 5 6-dihydroxy-1h-indole-2-carboxylic acid 4 5-dihydro-2-phenyl-1h-imidazole Indolo 3 2-b carbazole 5 6-dihydroxyindole-2-carboxylic acid
