[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a 2-oxo monocarboxylic acid anion that is the conjugate base of 4-methyl-2-oxopentanoic acid. It has a role as a human metabolite and a Saccharomyces cerevisiae metabolite. It is a 2-oxo monocarboxylic acid anion and a branched-chain keto acid anion. It is functionally related to a valerate. It is a conjugate base of a 4-methyl-2-oxopentanoic acid."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1]"}]