Used in peptide synthesis as a protected amino acid derivative, enabling the controlled assembly of complex peptides. The Fmoc group allows for mild base deprotection, making it compatible with solid-phase synthesis strategies. Its isoserine structure introduces a beta-hydroxy alpha-amino acid motif, which can influence peptide conformation and stability. Commonly applied in the development of bioactive peptides, enzyme inhibitors, and pharmaceutical research where specific stereochemistry and side-chain functionality are required.