[{"from": "human", "value": "Provide a brief overview of this molecule. [C][N][Branch1][S][C][C][C][C][Branch1][=Branch2][C][=C][N][=C][C][=C][Ring1][=Branch1][O][N][=O]"}, {"from": "gpt", "value": "The molecule is a member of the class of nitrosamines that is butan-1-ol substituted by a pyridin-3-yl group at position 1 and by a methyl(nitroso)amino group at position 4. It is a major metabolite of nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), which is a carcinogen found in tobacco and responsible for inducing lung cancer in smokers. It has a role as a biomarker, a human urinary metabolite and a carcinogenic agent. It is a member of pyridines, a nitrosamine and a secondary alcohol. It is functionally related to a 4-(N-nitrosomethylamino)-1-(3-pyridyl)butan-1-one."}]