1,4-Dioxane-2,5-bismethanol5-(hydroxymethyl)-1,4-dioxan-2-yl]methanolGlycerol Impurity 7 (Mixture of Diastereomers)Glycerol Impurity 4 (Mixture of Diastereomers)Bis(2,5-hydroxymethyl)dioxane(Mixture of Diastereomers)Bis(2,5-hydroxymethyl)dioxane\n(Mixture of Diastereomers)