E-64 is a professionally handled substance with documented safety properties. Its molecular formula is C15H27N5O5, with a molecular weight of 357.41. This compound belongs to the class of organic compounds containing nitrogen and oxygen atoms. It exhibits strong and highly selective inhibition of cysteine proteases such as papain, bromelain, ficin, cathepsin B, H and L, tumor-cathepsin, and calpain. However, it does not inhibit serine proteases except trypsin. The compound carries a Warning signal word due to potential organ damage upon single exposure.

• CAS Number: 66701-25-5
• Molecular Formula: C15H27N5O5
• Molecular Weight: 357.41
• Exact Mass: 357.20121898
• GHS Signal Word: Warning
• Hazard Statements:
• H371: May cause damage to organs [Warning Specific target organ toxicity, single exposure]