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N-(4-pentynoyl)-galactosamine tetraacylated (Ac4 GalNAl) can be used for the identification and characterization of specific surface groups of glycoproteins. The alkyne groups can react with azides via copper-catalyzed Click Chemistry. The acetyl groups on the glucose allow for easier penetration through the cell membrane.

(2S)-Ac4GalNAl can be used for the identification and characterization of specific surface groups of glycoproteins. The alkyne groups can react with azides via copper-catalyzed Click Chemistry. The acetyl groups on the glucose allow for easier penetration through the cell membrane.