Used as a chiral building block in the synthesis of complex peptides and pharmaceuticals, particularly in solid-phase peptide synthesis where stereochemical control is critical. Its tert-butyl protected side chain ensures stability under various reaction conditions, while the dicyclohexylamine (DCHA) salt form enhances crystallinity and handling properties. Commonly employed in the preparation of enzyme inhibitors and bioactive molecules requiring specific stereochemistry. The Z (benzyloxycarbonyl) group allows for selective deprotection, enabling stepwise assembly of peptide chains without racemization.