Widely used in peptide synthesis, this compound serves as a protected chiral building block for introducing modified amino acid residues into peptide chains. Its alkyne functionality allows for use in click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling efficient bioconjugation and labeling of peptides. The Fmoc group provides orthogonal protection for the amine, making it compatible with solid-phase peptide synthesis (SPPS) under mild basic conditions. Due to its structural rigidity and defined stereochemistry, it helps modulate peptide conformation and stability. It is also employed in the development of peptidomimetics and functionalized biomaterials.