This chemical, Boc-D-His(Tos)-OH, is a protected derivative of D-histidine widely used in peptide synthesis. The Boc (tert-butoxycarbonyl) group protects the α-amino function, while the Tos (tosyl) group protects the imidazole side chain of histidine, ensuring the residue remains stable during the synthesis process. It is valuable in the production of complex peptides and proteins. Its applications extend to pharmaceutical research, where it aids in the development of peptide-based drugs and therapeutic agents, particularly those incorporating D-amino acids for enhanced stability. Additionally, it is utilized in biochemical studies to explore protein interactions and enzyme functions, providing insights into biological processes. The protective groups allow for selective deprotection, enabling precise control in multi-step synthetic procedures.