Used as a chiral intermediate in the synthesis of pharmaceutical peptides, particularly in the development of protease inhibitors. Its stereochemistry allows for selective binding in biological systems, making it valuable in creating enantiomerically pure drugs. Commonly employed in solid-phase peptide synthesis where the Boc (tert-butoxycarbonyl) group provides temporary protection of the amine functionality, enabling stepwise assembly of complex peptide chains. The presence of phenylalanine-like structures supports studies in structure-activity relationships for enzyme inhibitors.