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Bonus: Avian and human Influenza A viruses recognize distinct types of glycan receptors on host cells as shown below. The two receptors differ in the connection of their non-reducing end sialic acid monosaccharides to the galactose monosaccharide next to it, either through 2,3 - or 2,6-glycosidic linkage. How can you use the methylation reaction of sugars; i.e., treatment with methyl iodide (CH3l) in the presence of base (K2CO3), and glycosidic bond hydrolysis to confirm the structure of each regioisomeric receptor? Show reaction scheme and provide rationale. (15 points)