J586 E-64 Grade:ULTRA PURE GRADE CAS Number: 66701-25-5Synonym(s): (TRANS-EPOXYSUCCINYL-L-LEUCYLAMIDO(4-GUANIDINO)BUTANE) Molecular Weight: 357.4 (Anhydrous)Molecular Formula: C15H27N5O5.1/2H2O Storage Condition: FROZEN CodeSizePriceQuantity J586-5MG An irreversible inhibitor of cysteine proteases like papain, calpain and cathepsin B, H, L and S. Also an effective inhibitor of collegenase.