9-ethyl-8-iodo-6,6-dimethyl-11-oxo-5H-benzo[b]carbazole-3-carbonitrile; 5H-Benzo[b]carbazole-3-carbonitrile, 9-ethyl-6,11-dihydro-8-iodo-6,6-dimethyl-11-oxo; 9-Ethyl-6,11-dihydro-8-iodo-6,6-dimethyl-11-oxo-5H-benzo[b]carbazole-3-carbonitrile