Quantity: 20 mg per vial (lyophilized powder) Purity: ≥ 99% (verified by HPLC) Form: Sterile, freeze-dried powder Storage: Store the lyophilized product at −20 °C for long-term preservation. Short-term storage may be maintained at 2–8 °C. Once reconstituted, keep refrigerated at 2–8 °C and protect from light.