[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a cyclopentenyl fatty acid consisting of undecanoic acid having a cyclopent-2-enyl group at the 11-position. It is a cyclopentenyl fatty acid, a monounsaturated fatty acid and a long-chain fatty acid."}, {"from": "gpt", "value": "[C][C][C][Branch1][Branch1][C][=C][Ring1][Branch1][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]