Used in biochemical research as a protease inhibitor, particularly effective against serine proteases due to its transition-state analog structure. Its hydroxyl and guanidinium groups enable strong interactions with enzyme active sites, making it valuable in studying enzyme mechanisms and designing therapeutic inhibitors. Also employed in the development of assays for protein degradation pathways and in structural studies to trap enzyme-substrate complexes for crystallography. Shows potential in anti-inflammatory and antiviral drug research owing to its ability to modulate proteolytic activity.