Used in peptide synthesis as a protected amino acid building block, particularly in the preparation of complex peptides requiring stereochemical control. The BOC and ALOC protecting groups allow for selective deprotection under mild conditions, enabling stepwise assembly without racemization. Commonly employed in solid-phase and solution-phase synthesis of bioactive peptides, including pharmaceutical intermediates. Its D-configuration supports the design of metabolically stable peptide analogs. The DCHA (dicyclohexylamine) salt form improves crystallinity and handling during purification steps.