Used in solid-phase peptide synthesis as a protected amino acid derivative, enabling selective assembly of complex peptides with controlled stereochemistry. The Fmoc group allows for mild base deprotection, compatible with a wide range of side-chain protecting groups. Particularly valuable in synthesizing peptides containing non-natural amino acids or for introducing specific structural modifications in medicinal chemistry research. Commonly applied in the development of peptide-based drugs, biochemical probes, and diagnostic agents.