E-64 is a professionally handled substance with documented safety properties, identified as a member of the peptide-based inhibitor class. Its molecular formula is C15H27N5O5, with a molecular weight of 357.41. This compound exhibits a specific structure that allows it to function as an irreversible, strong, and highly selective inhibitor of cysteine proteases, such as papain, bromelain, ficin, cathepsin B, H, and L, tumor-cathepsin, and calpain. It does not inhibit serine proteases except trypsin. A Warning signal word indicates potential hazards, including possible organ damage upon single exposure, as specified by the Hazard Statements.

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