[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][C][C][N][Branch1][=Branch1][C][C][C][C][O][N][=O]"}, {"from": "gpt", "value": "The molecule is a synthetic carcinogenic compound found in a variety of smokes and industrial products, N-butyl-N-4-hydroxybutyl nitrosamine is used in biomedical research to induce transitional and squamous cell urinary bladder cancers and to promote experimental hepatocarcinogenesis, probably through abnormal DNA methylation. (NCI04)"}]