This reagent is a specialized protecting agent used in organic synthesis, particularly for the guanidino group of arginine residues in peptide synthesis. It introduces a bis(tert-butoxycarbonyl) (di-Boc) protected guanidine moiety via the pyrazol-1-yl activating group, which acts as a good leaving group. The di-Boc protection provides orthogonality, remaining stable during selective deprotection of other Boc-protected amines, thus preventing side reactions and enabling the construction of complex peptides. It is widely employed in the synthesis of biologically active peptides, pharmaceuticals, and research compounds requiring precise control over functional group reactivity.