This chemical is primarily used in peptide synthesis as a protected arginine derivative. The Boc (tert-butyloxycarbonyl) group safeguards the amino group, while the Mtr (4-methoxy-2,3,6-trimethylphenylsulfonyl) group protects the guanidine moiety of arginine. This dual protection is crucial in preventing unwanted side reactions during the stepwise assembly of peptides. It is particularly valuable in solid-phase peptide synthesis (SPPS), where selective deprotection and coupling steps are essential. The Mtr group can be removed under mild acidic conditions, making it suitable for synthesizing complex peptides without disrupting other sensitive functional groups. Its application is significant in producing peptides for research, pharmaceuticals, and biotechnology, especially when arginine residues are involved.