Methyl 2,3,4,6-Tetra-O-benzyl-D-glucoside-13C is an intermediate used in the synthesis of Isomaltose-13C (I821252), which is the labelled Isomaltose. One of the main product of transformation of maltose into prebiotic isomaltooligosaccharides by novel a-glucosidase from Xantophyllomyces dendrorhous.