[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=C][C][C][C][=C][Ring1][Branch1][C][=Branch2][Ring1][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][C][=C][Ring1][=Branch1][Ring1][#Branch2][C][=C][Ring2][Ring1][Ring2]"}, {"from": "gpt", "value": "The molecule is a polycyclic aromatic hydrocarbon that consists of five fused rings with carcinogenic activity. 20-Methylcholanthrene is often used in experimental cancer studies."}]