Used primarily in peptide synthesis as a protecting group for cysteine residues. It helps prevent unwanted side reactions during the assembly of peptide chains. The Boc group protects the amine functionality, while the S-tert-butylmercapto group shields the thiol group of cysteine, ensuring selective reactivity. This compound is particularly valuable in the production of complex peptides and proteins, where precise control over the protection and deprotection of functional groups is critical. It is also employed in the development of peptide-based drugs and biochemical research, where maintaining the integrity of cysteine residues is essential for proper folding and function.