Fmoc-HoArg-OH.HCl is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) as a protected amino acid derivative. The Fmoc (fluorenylmethyloxycarbonyl) group serves as a temporary protecting group for the amino group, allowing for selective deprotection during the synthesis process. This compound is essential for introducing arginine residues into peptides while maintaining control over the reaction sequence. It is particularly valuable in the production of peptides for research, pharmaceuticals, and biotechnology applications, where precise peptide sequences are critical. Its compatibility with automated peptide synthesizers makes it a key component in high-throughput peptide production. Additionally, it is used in the development of peptide-based drugs, diagnostics, and biomaterials due to its stability and efficiency in coupling reactions.