[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a prostanoid."}, {"from": "gpt", "value": "[C][C][C][C][C][C][=Branch1][C][=O][/C][=C][/C@@H1][C][Branch1][#Branch2][C][Branch1][=Branch1][C][C][Ring1][Branch1][=C][O][C][/C][=C][\\C][C][C][C][=Branch1][C][=O][O]"}]