Used in glycopeptide synthesis as a protected glycosylated amino acid building block. The compound enables solid-phase peptide synthesis by incorporating a mannose-modified alanine residue into peptide chains. The fluorenylmethyloxycarbonyl (Fmoc) group provides orthogonal protection for the amino function, allowing stepwise assembly under mild basic conditions. Acetyl groups on the sugar moiety stabilize the structure during coupling reactions and can be removed selectively after peptide assembly to expose hydroxyl groups for further modification. Commonly applied in the preparation of glycoprotein mimics, vaccine candidates, and bioactive glycopeptides for pharmaceutical research.