N-A-BOC-N-D-Z-D-LYSINE is primarily used in peptide synthesis as a protected form of lysine. The BOC (tert-butyloxycarbonyl) and Z (benzyloxycarbonyl) groups act as protective groups for the amino and side chain functionalities, respectively, during the synthesis process. This allows for selective deprotection and coupling reactions, ensuring the correct sequence and structure of the peptide. It is particularly valuable in solid-phase peptide synthesis (SPPS) and in the preparation of complex peptides for pharmaceutical research, drug development, and biochemical studies. Its use helps to improve the efficiency and accuracy of peptide assembly, making it a critical reagent in the field of peptide chemistry.