[{"from": "human", "value": "Provide a brief overview of this molecule. [C][N][C][C][C][C@H1][Ring1][Branch1][C][=C][N][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a natural alkyloid that is a major component of cigarettes and is used therapeutically to help with smoking cessation. Nicotine has not been associated with liver test abnormalities or with clinically apparent hepatotoxicity."}]