The molecule is a 4-hydroxymandelic acid that has S-configuration. It is a (2S)-2-hydroxy monocarboxylic acid and a 4-hydroxymandelic acid. It is a conjugate acid of a (S)-4-hydroxymandelate. It is an enantiomer of a (R)-4-hydroxymandelic acid.
(2S)-2-hydroxy-2-(4-hydroxyphenyl)acetic acid