Z-Arg-OH·HCl is a salt form of Z-Arg-OH, a derivative of arginine, an essential amino acid utilized in peptide synthesis and organic chemistry. The Z (benzyloxycarbonyl) group serves as a protective agent for the guanidino group during chemical reactions, enabling precise manipulation and controlled synthesis of complex molecules. This compound finds wide application in research, pharmaceutical development, and various organic synthetic processes due to its stability and compatibility with diverse synthetic protocols.