Used in solid-phase peptide synthesis as a chiral building block for incorporating azide-functionalized amino acids into peptide chains. The Fmoc group allows for orthogonal protection, enabling stepwise assembly of peptides under mild basic conditions. The azide moiety serves as a handle for downstream conjugation via click chemistry, such as Cu(I)-catalyzed azide-alkyne cycloaddition, making it valuable in bioconjugation, peptide labeling, and construction of peptide-based hybrids or probes. Its stereochemistry ensures proper folding and biological activity in synthesized peptides.