[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a prostanoid that is prostaglandin E2 lacking two methylenes in the carboxyalkyl chain. It has a role as a metabolite. It is a prostanoid, a monocarboxylic acid, a cyclic ketone and a secondary alcohol."}, {"from": "gpt", "value": "[C][C][C][C][C][C@@H1][Branch2][Ring1][#Branch2][/C][=C][/C@H1][C@@H1][Branch2][Ring1][C][C][C][=Branch1][C][=O][C@@H1][Ring1][=Branch1][C][/C][=C][\\C][C][=Branch1][C][=O][O][O][O]"}]