Cell permeable, irreversible and non-toxic non-FMK pan-caspase inhibitor with improved potency, stability and toxicity over Z-VAD-FMK. Does not cross-react with cathepsins nor calpains. Non-toxic due to the 2,6-difluorophenoxy methyl (OPh) group. The peptide is not O-methylated to reduce hydrophobicity and to facilitate use in aqueous media. Inhibits ICE-family protease/caspase processing, leading to apoptosis and autophagy induction. Decreases proteasome activity. Used in apoptosis and inflammasome studies.