Standsrd: DAB6,8,10.USP,EP BP | Appearance: White crystalline powder | Assay: up to standard | Melting point: 172-180℃ | Non-volatile-residue: ≤ 0.05% | Chloride: ≤ 100mg/kg | Identification: up to standard | Clarity of the solution: up to standard | Acidity or Alkalinity: up to standard