Used in peptide synthesis as a protected amino acid building block, particularly in the production of therapeutic peptides and research compounds. The Boc (tert-butoxycarbonyl) group protects the amine functionality, allowing selective reaction at the carboxylic acid site during coupling steps. Its D-configuration makes it valuable for creating peptides with enhanced metabolic stability or specific conformational properties. Commonly applied in pharmaceutical development and biochemical studies where stereochemistry influences biological activity.