This chemical, Z-Arg(Mtr)-OH·CHA, is widely used in peptide synthesis as a protected form of arginine. The Z (benzyloxycarbonyl) group protects the α-amino function, while the Mtr (4-methoxy-2,3,6-trimethylbenzenesulfonyl) group protects the guanidino side chain of arginine, ensuring selective deprotection of functional groups. It serves as a key intermediate in the production of complex peptides, particularly in solid-phase peptide synthesis (SPPS), where the Mtr group provides stability under acidic conditions. Additionally, its use in combinatorial chemistry and drug development allows for the creation of peptide-based pharmaceuticals with enhanced specificity and efficacy. The cyclohexylamine (CHA) salt form improves solubility and handling, facilitating its application in laboratory and industrial settings.