Sodium Salt of Dexpanthenol impurity B

The Sodium Salt of Dexpanthenol Impurity B is a degradation byproduct arising from the partial hydrolysis of Dexpanthenol's acetal moiety, resulting in a sodium-substituted carboxylate group conjugated to a pentanol backbone. This impurity retains the chiral centers of the parent compound but exhibits altered polarity due to the ionic sodium-carboxylate interaction. Structurally, it diverges from Dexpanthenol by the loss of the thiol functionality and the formation of a sodium-stabilized ester-like linkage. It functions as an HPLC reference standard for quantifying process-related impurities in Dexpanthenol active pharmaceutical ingredient batches.