The molecule is the hydroxy fatty acid anion that is formed by loss of a proton from the carboxy group of (S)-3-hydroxyisobutyric acid. It is a conjugate base of a (S)-3-hydroxyisobutyric acid. It is an enantiomer of a (R)-3-hydroxyisobutyrate.
(2S)-3-hydroxy-2-methylpropanoate