[{"from": "human", "value": "What can you tell me about this molecule? [C][C][Branch1][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][O]"}, {"from": "gpt", "value": "The molecule is the S-enantiomer of 2-hydroxy-3-methylbutyric acid. It is used as a chiral building block for peptide synthesis. It has a role as a chiral reagent and a human metabolite. It is a conjugate acid of a (S)-2-hydroxy-3-methylbutyrate. It is an enantiomer of a (R)-2-hydroxy-3-methylbutyric acid."}]