Potent, reversible and cell-permeable inhibitor of the 19S deubiquitinases (DUBs) ubiquitin-specific-processing protease 14 (USP14) and ubiquitin carboxyl-terminal hydrolase isozyme L5 (UCHL5). Inhibitor of the 20S proteasome. Anti-tumor compound.Identity:Determined by 1H-NMR.Molecular Formula:C22H17N3O6Molecular Weight:419.4Storage and Stability:Stable for at least 6 months after receipt when stored at -20°C.