[{"from": "human", "value": "Provide a description of this molecule. [C][C][C@H1][Branch1][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is the (S)-enantiomer of 2-methylbutanoic acid. It is a conjugate acid of a (S)-2-methylbutanoate. It is an enantiomer of a (R)-2-methylbutyric acid."}]