[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a (3R)-3-hydroxy fatty acid anion resulting from the deprotonation of the carboxy group of (R)-3-hydroxypentanoic acid. The major species at pH 7.3. It is a (3R)-3-hydroxy fatty acid anion and a short-chain fatty acid anion. It is a conjugate base of a (R)-3-hydroxypentanoic acid. It is an enantiomer of a (S)-3-hydroxypentanoate."}, {"from": "gpt", "value": "[C][C][C@H1][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][O]"}]