Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the preparation of biologically active peptides and enzyme inhibitors. Its protected amine and keto functionalities allow selective reactions in multi-step organic syntheses. Commonly employed in asymmetric synthesis to introduce stereochemically defined intermediates. The benzyl and tert-butyl protecting groups offer stability under various reaction conditions and can be removed selectively to enable further functionalization. Widely applied in medicinal chemistry for developing protease inhibitors and other therapeutic agents requiring high enantiomeric purity.