2-Hydroxy-3,3-dimethylbutyric acid 22146-54-9 3,3-Dimethyl-2-hydroxybutyric acid 4026-20-4 Butanoic acid, 2-hydroxy-3,3-dimethyl- Butyric acid, 2-hydroxy-3,3-dimethyl- EINECS 223-698-0