[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a 2-oxo monocarboxylic acid anion that is the conjugate base of 2-oxooctanoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is functionally related to an octanoate. It is a conjugate base of a 2-oxooctanoic acid."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}]