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Name the disaccharide that is used as a starting substrate for the synthesis of sucralose. What chemical modifications have been made to the starting disaccharide? CH2OH O CI OH I H OH O H CH2CI O 14. Keratan sulfate is a glycosaminoglycan composed primarily of the following repeating disaccharide unit:-Gal B(1 — 4) GlcNAc6S B( 13)—. The acetylated sugar has a sulfate ester on C-6. Ker- atan sulfate is found in cornea, bone, and cartilage aggregated with other glycosaminoglycans such as chondroitin sulfate. Draw a Haworth projection of the repeating disaccharide unit found in keratan sulfate. 15. A number of diseases result from hereditary deficiencies in spe- cific glycosidases. In these diseases, certain glycoproteins are in- completely degraded and oligosaccharides accumulate in tissues. Which of the N-linked oligosaccharides in Figure

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