[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a prostanoid."}, {"from": "gpt", "value": "[C][C][C][C][C][C@H1][C@H1][Branch1][#Branch1][C][C][C][Ring1][Branch1][=O][C][C][C][C][C][C][=Branch1][C][=O][O]"}]