[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a hydroxy monocarboxylic acid anion. It is functionally related to a butyrate. It is a conjugate base of a 2,3-dihydroxy-3-methylbutanoic acid."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][Branch1][#Branch2][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O][O]"}]