Fmoc-D-Trp-OH is primarily used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) methods. It serves as a building block for incorporating the D-tryptophan amino acid into peptide chains. The Fmoc (fluorenylmethyloxycarbonyl) group acts as a protecting group for the amino function, ensuring selective reactions during the synthesis process. This compound is valuable in the production of peptides with specific chiral configurations, which are essential in biochemical research, drug development, and the study of peptide-based therapeutics. Its application is critical in creating peptides with enhanced stability and biological activity, particularly in the design of enzyme inhibitors, receptor agonists, and antagonists.