[{"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@H1][C][C][=Branch1][C][=O][C@@H1][Branch1][#Branch2][C@H1][Ring1][=Branch1][C][C][C][Ring1][#Branch2][=O][C][/C][=C][\\C][C][C][C][=Branch1][C][=O][O]"}]