[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an aromatic hydrocarbon that consists of five fused rings and is formed during the incomplete combustion of organic matter. Cyclopenta[c,d]pyrene is primarily found in gasoline engine exhaust. This substance is used in laboratory research as a mutagen and carcinogen. Cyclopenta[c,d]pyrene is reasonably anticipated to be a human carcinogen. (NCI05)"}, {"from": "gpt", "value": "[C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][Branch1][C][Ring1][#Branch2][=C][Branch1][Branch1][C][=C][Ring1][=C][C][=C][Ring1][Branch2]"}]