Used in peptide synthesis as a protected D-diaminopropionic acid (D-DAP) building block, particularly in the preparation of complex peptides where selective protection and orthogonal deprotection strategies are required. The Boc group provides temporary protection of the alpha-amino function, while the Aloc group protects the side-chain amine of the D-DAP residue, allowing stepwise assembly with minimal side reactions. The DCHA (dicyclohexylamine) salt form improves crystallinity and handling during coupling steps. Commonly applied in solid-phase and solution-phase synthesis of bioactive peptides, including antibiotics and enzyme inhibitors, where stereochemical control and side-chain functionality management are critical.