Highly potent and selective cell permeable inhibitor of the proteasome. Inhibits the chymotrypsin-like and caspase-like peptidase activity of the proteasome. Calpain and cathepsin inhibitor. Autophagy activator. Similar structure as MG-132 but much higher potency.Molecular Formula:C25H42BN3O6Molecular Weight:491.4Sequence: Z-Leu-Leu-Leu-B(OH)2Solubility:Soluble in DMSOStorage and Stability:Stable for at least 1 year after receipt when stored at -20°C.