is deprotonated form of has functional parent 4-amino-3-hydroxybutanoate 4-Amino-3-hydroxybutanoate The conjugate base of γ-amino-β-hydroxybutyric acid arising from deprotonation of the carboxy group. gamma-amino-beta-hydroxybutyric acid butyrate hydroxy monocarboxylic acid anion gamma-amino-beta-hydroxybutyric acid zwitterion gamma-amino acid anion