[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a tetraphene having methyl substituents at the 7- and 12-positions. It is a potent carcinogen and is present in tobacco smoke. It has a role as a carcinogenic agent. It is a member of tetraphenes and an ortho-fused polycyclic arene."}, {"from": "gpt", "value": "[C][C][=C][C][=C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][Ring1][#Branch2][=C][Branch1][N][C][=C][C][=C][C][=C][Ring2][Ring1][C][Ring1][=Branch1][C]"}]