Used as a broad-spectrum caspase inhibitor in apoptosis research. It effectively blocks programmed cell death by irreversibly binding to the active site of caspases, making it valuable for studying cell death pathways and inflammatory processes. Commonly applied in cell-based assays to confirm the involvement of caspases in apoptosis. Also used in studies of necroptosis to distinguish caspase-dependent and independent pathways. Its cell permeability allows for direct use in culture systems. Frequently employed in immunology, neuroscience, and cancer research to modulate cell survival and death mechanisms.