[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a carbobicyclic compound consisting of two ortho-fused cyclopentane rings and containing one double bond located at position 2. It is a polycyclic olefin and a carbobicyclic compound."}, {"from": "gpt", "value": "[C][C][C][C][C][=C][C][Ring1][Branch1][C][Ring1][Branch2]"}]