[{"from": "human", "value": "Describe this molecule. [C][=C][C][=C][Branch2][Ring1][Branch1][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=Branch1][C][=O][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N][N]"}, {"from": "gpt", "value": "The molecule is a ketone and an amino acid derivative that is synthesized by either tryptophan 2,3-dioxygenase (TDO)- or indoleamine 2,3-dioxygenase (IDO)-mediated oxidation of tryptophan with diverse biological functions, including vasodilatory, immunoregulatory and neuromodulatory activities. Kynurenine is a precursor for niacin. Additionally, kynurenine can be further metabolized into anthranilic acid, kynurenic acid, and 3-hydroxykynurenine; aberrant production of kynurenine is associated with neurological disease-related cognitive deficits and depressive symptoms. Overexpressed in certain cancer cell types, kynurenine could potentially be used as a biomarker to assess cancer risk."}]