9-Ethyl-6,11-dihydro-8-hydroxy-6,6-dimethyl-11-oxo-5H-benzo[b]carbazole-3-carbonitrile is a tetracyclic compound that is analogue of 11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile derivatives which are anaplastic lymphoma kinase inhibitors that can potentially be used for prevention and treatment of cancer, depression, and cognitive impairments.