[{"from": "human", "value": "Describe this molecule. [C][=C][C][=C][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][Ring1][N][=C][C][Ring1][S][=C][Ring2][Ring1][Ring2]"}, {"from": "gpt", "value": "The molecule is a colorless, aromatic hydrocarbon consisting of five fused rings and formed by the incomplete burning of organic matter. Benzo(b)fluoranthene is primarily found in gasoline exhaust, tobacco and cigarette smoke, coal tar, soot, amino acids and fatty acid pyrolysis products. This substance is used only for research purposes. Benzo(b)fluoranthene is reasonably anticipated to be a human carcinogen. (NCI05)"}]