4-Hydroxybutanoate 4-hydroxybutyrate 1320-61-2 ZINC01532805 Butanoic acid, hydroxy-, ion(1-) Butyric acid, hydroxy-, ion(1-) CHEBI:16724 Gamma Hydroxy butyrate c0022 Hydroxybutyrate 4-hydroxy-butanoic acid gamma-Hydroxybutyrate