Used as a glycosyl donor in carbohydrate chemistry, particularly in the synthesis of complex oligosaccharides and glycoconjugates. Its protected functional groups allow selective deprotection and coupling, making it valuable in constructing β-linked glycosidic bonds found in biologically active natural products and pharmaceutical intermediates. The allyl and benzylidene protecting groups offer orthogonal stability during stepwise synthesis, while the phthalimido group directs stereoselective glycosylation. Commonly applied in the preparation of glycosaminoglycan fragments and vaccine candidates.