Used as a reagent in peptide synthesis, particularly for introducing phenylalanine residues into peptide chains. It serves as a protected amino acid derivative, ensuring selective coupling reactions. Commonly applied in solid-phase peptide synthesis (SPPS) to build complex peptides and proteins. Its active ester form facilitates efficient amide bond formation with other amino acids or peptides. Valuable in research and pharmaceutical development for creating biologically active peptides and studying their properties.