Carbohydrate-protein linkages model compounds

D-Gal — hydroxy-L-histidine,4950 d-G1cA — hydroxy-L-tryptophan,51 d-GlcA — hydroxy-L-phenylalanine,51 d-G1cA — L-Ser,51 and carbohydrates N-glycosylated to the a-amino group of the N-terminal portion of proteins.51-53 Most of these compounds will be discussed in more depth later in this article, in terms of model compounds for oligosaccharide linkages to proteins. 

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