[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a monocarboxylic acid anion. It is functionally related to a costunolide."}, {"from": "gpt", "value": "[C][/C][=C][\\C][C][/C][=Branch2][Ring1][=Branch1][=C][/C@H1][Branch1][P][C@@H1][Branch1][Branch1][C][C][/-Ring1][#Branch2][C][=Branch1][C][=C][C][=Branch1][C][=O][O-1][O][/C]"}]