3.4.22.54 0.00025 - calpain inhibitor I IC50: 0.00025 mM 649028 3.4.22.54 0.00025 - calpain inhibitor II IC50: 0.00025 mM 649028 3.4.22.54 0.002 - leupeptin IC50: 0.002 mM 649028 3.4.22.54 0.0036 - recombinant rat brain calpastatin IC50: 0.0036 mM 649028