2-HYDROXYBUTANOIC ACID 2-Hydroxybutyric acid 5094-24-6 565-70-8 Butanoic acid, 2-hydroxy- (9CI) Butyric acid, 2-hydroxy- (8CI) NSC 6495 alpha-Hydroxy-n-butyric acid alpha-Hydroxybutyrate alpha-Hydroxybutyric acid