Used as a glycosyl donor in carbohydrate chemistry, particularly in the synthesis of oligosaccharides and glycoconjugates. Its protected functional groups allow selective deprotection and coupling, making it valuable for constructing complex sugar moieties found in natural products and pharmaceuticals. Commonly employed in the preparation of glycosidic bonds with stereochemical control, especially in the development of antibiotics and other bioactive molecules. The phthalimido group provides both nitrogen protection and stereo-directing effects during glycosylation reactions.