Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), to introduce modified phenylalanine residues into peptides. The Fmoc group protects the amino group during synthesis, while the iodine substitution on the phenyl ring allows for further functionalization, such as cross-coupling reactions. This chemical is valuable in creating peptide-based drugs, biomaterials, and research tools, especially in studies involving peptide-protein interactions or labeled peptides for imaging and diagnostics. Its unique structure enables the development of peptides with tailored properties for specific applications.