This compound, H-D-Lys(Boc)-NH2, is a side-chain protected derivative of D-lysine, specifically the ε-Boc protected lysinamide. It serves as a C-terminal building block in peptide synthesis, particularly in solution-phase methods or fragment coupling strategies. The free α-amino group enables amide bond formation with the carboxyl terminus of a growing peptide chain, while the Boc (tert-butoxycarbonyl) group protects the lysine side-chain ε-amino group from unwanted reactions during synthesis. Following peptide assembly, the Boc group is selectively removed under acidic conditions (e.g., trifluoroacetic acid), liberating the free ε-amino group. This reagent is essential for constructing C-terminal amidated peptides used in pharmaceuticals, biochemical research, and biotechnology.