Appearance of the original drug is gray-white crystals, specific gravity 1.44 (20C), melting point 181-182C, 20C vapor pressure 0.0147mPa (20C); solubility (20C): in water, hexane, chloroform, benzene, acetone solubility of 1.45*10-2g/l, 0.2g/L, 234.4g/L, 15.6g/L. 31.7g/L. The original content of active ingredients is less than 98%, stable storage under normal conditions, 31.7g/L. The content of the original active ingredient is not less than 98%, and the storage is stable under normal conditions.
