Used in peptide synthesis as a protected amino acid derivative, particularly in solid-phase peptide synthesis (SPPS). The Fmoc group provides temporary protection for the amino terminus, allowing selective deprotection under mild basic conditions, while the azide group can be reduced to an amine for further coupling or used in click chemistry reactions. Its stereochemistry supports the construction of sequence-specific peptides with defined secondary structures. Commonly employed in the preparation of custom peptides for research in biochemistry, drug development, and molecular biology.