Fmoc-Arg-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a building block for incorporating arginine into peptide chains. The Fmoc (fluorenylmethyloxycarbonyl) group acts as a protective group for the amino acid, ensuring selective reactions during the synthesis process. This compound is essential in producing peptides for research, pharmaceuticals, and biotechnology applications, such as developing drugs, studying protein interactions, and creating bioactive peptides. Its stability and compatibility with SPPS make it a valuable tool in peptide chemistry.