Synonyms: Butanoic acid, 2,4-dihydroxy-3,3-dimethyl-, sodium salt (1:1), (2R)-, Butanoic acid, 2,4-dihydroxy-3,3-dimethyl-, monosodium salt, (R)- (9CI), (R)-Pantoic acid sodium salt, D-Pantoic acid sodium salt, Sodium (R)-pantoate, Sodium D-pantoate, Sodium (2R)-2,4-dihydroxy-3,3-dimethyl-butanoate, Dexpanthenol Impurity 1 Sodium Salt