[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a prostanoid."}, {"from": "gpt", "value": "[C][C][C][C][C][/C][=C][/C][=C][/C][=C][C][=Branch1][C][=O][C@@H1][\\-Ring1][=Branch1][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]