Used in peptide synthesis as a protected D-aspartic acid derivative with an alpha-amide group. The Boc (tert-butyloxycarbonyl) group protects the amino group, while the alpha-amide prevents side reactions at the alpha-carboxyl, enabling selective coupling via the beta-carboxyl group. This form stabilizes the molecule and supports the construction of complex peptides, particularly those with C-terminal amides, in solid-phase or solution-phase synthesis. Commonly applied in the development of pharmaceuticals and bioactive peptides where precise stereochemistry, including the D-configuration, is required. The Boc group allows for mild, acid-labile deprotection, making it compatible with a wide range of synthetic strategies in medicinal chemistry.