[{"from": "human", "value": "Provide a description of this molecule. [C][C][C@@H1][Branch1][O][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O][O]"}, {"from": "gpt", "value": "The molecule is an optically active form of 4-hydroxy-2-oxohexanoic acid having 4S-configuration. It is a conjugate acid of a (S)-4-hydroxy-2-oxohexanoate."}]