[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a hydroxy monocarboxylic acid anion that is the conjugate base of (S)-3,4-dihydroxy-2-oxobutanoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a hydroxy monocarboxylic acid anion and a 2-oxo monocarboxylic acid anion. It is a conjugate base of a (S)-3,4-dihydroxy-2-oxobutanoic acid. It is an enantiomer of a (R)-3,4-dihydroxy-2-oxobutanoate."}, {"from": "gpt", "value": "[C][Branch1][=C][C@@H1][Branch1][#Branch2][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1][O][O]"}]