Gentiobiose, a rare disaccharide found in saffron and gentian, is a reducing sugar and forms only n-glucose on hydrolysis with aqueous acid. Reaction of Gentiobiose with iodomethane and Ag20 yields an octamethyl derivative, which can be hydrolyzed with aqueous acid to give 1 equivalent of 2, 3, 4, 6-tetra-O-mehyl-D-glucopyranose and 1 equivalent of 2, 3, 4-tri-O-methyl-n.glucopyranosc. If Gentiobiose contains a β-glycoside link, what is its structure?

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2o3POC CH20H .. НО 2-ОЗРОСН2 0 он он но он NH2 Fructose 6-phosphate Glucosamine 6-phosphate