[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a 2-hydroxy-3-methylpentanoate in which the stereocentres at positions 2 and 3 both have R-configuration. It is a (2R)-2-hydroxy fatty acid anion and a 2-hydroxy-3-methylpentanoate. It is a conjugate base of a (2R,3R)-2-hydroxy-3-methylpentanoic acid."}, {"from": "gpt", "value": "[C][C][C@@H1][Branch1][C][C][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O]"}]