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In organic chemistry, a glycosyl group is a univalent free radical or substituent structure obtained by removing the hydroxyl () group from the hemiacetal () group found in the Cyclic compound form of a monosaccharide and, by extension, of a lower oligosaccharide. Glycosyl groups are exchanged during glycosylation from the glycosyl donor, the electrophile, to the glycosyl acceptor, the nucleophile. The outcome of the glycosylation reaction is largely dependent on the reactivity of each partner. Glycosyl also reacts with , such as phosphoric acid, forming an ester such as glucose 1-phosphate.
Recent detection of Au3+ in vivo used C-glycosyl pyrene. Its fluorescence and permeability through cell membranes helped detect Au3+.
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