Used as a key chiral intermediate in the synthesis of protease inhibitors, particularly in the development of antiviral agents such as hepatitis C virus (HCV) inhibitors. Its stereochemistry enables selective binding to enzyme active sites, enhancing drug efficacy. The tert-butoxycarbonyl (Boc) protecting group facilitates stepwise peptide coupling, while the ester moiety allows for further functionalization. Commonly employed in multi-step organic syntheses where enantiomeric purity is critical for biological activity.