Used in biochemical research as a peptide-based inhibitor targeting specific proteolytic enzymes. Its structure allows selective interaction with enzyme active sites, making it valuable in studying enzyme mechanisms, particularly in the development of therapeutic agents for diseases involving protein misfolding or abnormal proteolysis. Also employed in structure-activity relationship (SAR) studies to design more stable or potent peptide analogs. Its cyclic and modified amino acid residues enhance metabolic stability and binding affinity, useful in drug discovery and molecular pharmacology.