[{"from": "human", "value": "Generate a molecule based on this description. The molecule is the anion of 2-oxononanoic acid. It is functionally related to a nonanoate. It is a conjugate base of a 2-oxononanoic acid."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}]