Used as a key chiral intermediate in the synthesis of pharmaceuticals, particularly in the development of protease inhibitors and antiviral agents. Its protected hydroxyl and amine functionalities allow selective reactions in multi-step organic syntheses. The stereochemistry at the 2 and 4 positions enables precise control over the three-dimensional structure of the final drug molecule, enhancing biological activity and selectivity. Commonly employed in the preparation of HIV and HCV therapeutic candidates.