[{"from": "human", "value": "Describe this molecule. [C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=C][C][=N][C][=C][Branch1][#Branch1][C][=C][Ring1][=Branch1][Ring1][O][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][Ring1][N]"}, {"from": "gpt", "value": "The molecule is a yellowish aromatic hydrocarbon consisting of five fused rings formed by the incomplete burning of organic matter. Dibenz[a,j]acridine is primarily found in gasoline exhaust, petroleum refinery incinerator emissions, coal combustion emissions, cigarette smoke and coal tar pitch. This substance is used only for research purposes. Dibenz[a,j]acridine is reasonably anticipated to be a human carcinogen. (NCI05)"}]