Used in the synthesis of glycopeptide-based vaccines and immunotherapeutics, particularly targeting bacterial pathogens that display mannose-rich polysaccharides on their surface. Enables site-specific incorporation of a disaccharide-modified serine into peptide chains via solid-phase peptide synthesis. This building block supports the study of carbohydrate-protein interactions in immune recognition and aids in developing synthetic antigens for diseases involving aberrant glycosylation, such as tuberculosis or certain cancers. The acetyl-protected sugar moieties allow for controlled deprotection and further conjugation downstream.