Appearance White crystals or crystalline powder Identification(IR) Infrared Absorption Assay 98.5%-101.5% Residue on ignition ≤ 0.4% Chloride(Cl) ≤ 0.05% Sulfate(SO4) ≤ 0.03% Iron(Fe) ≤ 30ppm Heavy metals(Pb) ≤ 15ppm Specific rotation [α]D25 +14.9°~+17.3° Related Compounds Not more than 0.5% of any individual impurity is found; Not more than 2.0% of total impurities is found Loss on drying ≤ 0.2% pH 5.5~7.0