Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) as a building block. The Fmoc group protects the amino group, while the pentafluorophenyl (OPfp) ester facilitates efficient coupling with other amino acids. It is especially valuable for introducing D-phenylalanine into peptides, which is crucial for creating peptides with specific stereochemistry or enhanced stability. Commonly applied in the development of therapeutic peptides, research on peptide-based drugs, and studies involving peptide structure-activity relationships. Its high reactivity and selectivity make it a preferred choice in organic and medicinal chemistry laboratories.