Used in solid-phase peptide synthesis as a protected amino acid derivative, enabling the incorporation of a pyridine-containing amino acid residue into peptide chains. The Fmoc group allows for mild base deprotection, making it compatible with Fmoc-strategy synthesis. The 3-pyridyl side chain can serve as a metal coordination site or hydrogen bond acceptor, useful in designing functional peptides, catalysts, or bioactive molecules. Commonly applied in the development of enzyme inhibitors, receptor ligands, and peptidomimetics where aromatic nitrogen heterocycles are required for activity.