Used as a key intermediate in carbohydrate chemistry, particularly in the synthesis of complex oligosaccharides and glycoconjugates. Its protected hydroxyl groups allow selective functionalization, making it valuable in the preparation of biologically active molecules such as vaccines and natural product analogs. The orthoester group stabilizes the anomeric center during glycosylation reactions, improving stereocontrol. Commonly employed in the assembly of mannose-containing structures found in microbial polysaccharides and glycoproteins.