[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a prostanoid."}, {"from": "gpt", "value": "[C][C][C][C][C][Branch1][C][C][Branch1][C][C][C][Branch2][Ring1][Branch2][/C][=C][/C@H1][C][C][C][=Branch1][C][=O][C][Ring1][=Branch1][C][/C][=C][\\C][C][C][C][=Branch1][C][=O][O][O]"}]