Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and other biologically active compounds. Its protected amine and carboxylic acid functionalities make it ideal for peptide coupling and solid-phase synthesis. The pyrrolidine ring with defined stereochemistry supports conformational restriction in drug design, enhancing selectivity and metabolic stability. Commonly employed in the preparation of antiviral and anticancer agents where stereochemical control is critical.