Caspase-Family Inhibitor Z-VAD-FMK. Caspase family substrate, Synonyms: Z-VAD-FMK, Z-VAD fluoromethylketone, Caspase-Family Inhibitor, pan-caspase inhibitor, CAS Number: 187389-52-2, Purity: Single spot by Thin Layer Chromatography, Molecular Formula: C22HGGNGOGF, 20ul.