Used in the synthesis of glycopeptides for research in glycobiology, particularly in studying cell surface interactions and immune responses. Its structure allows for solid-phase peptide synthesis with orthogonal protection, enabling precise assembly of complex O-linked glycans found in mucin-type glycoproteins. Commonly applied in developing antigen mimics, cancer vaccine candidates, and probes for glycosyltransferase activity. The Fmoc group facilitates stepwise elongation in automated synthesizers, while the acetyl-protected sialyl-Tn antigen mimic ensures stability during deprotection and coupling steps.