Used in peptide synthesis as a protected amino acid building block, particularly in solid-phase synthesis. The azido group allows for selective modification via click chemistry, enabling the construction of complex peptide architectures or conjugation with other biomolecules. The fluorenylmethyloxycarbonyl (Fmoc) group provides temporary N-terminal protection, compatible with standard Fmoc-strategy protocols. Its structure supports the incorporation into peptide chains where side-chain functionality can be later activated through reduction of the azide to an amine. Commonly applied in the development of bioconjugates, peptide drugs, and functionalized biomaterials.