Sparingly soluble in water, soluble in methanol, practically insoluble in methylene chloride.

IR

The soluble in clear and not more intensely coloured than reference solution Y6.

Impurities G and H≤0.1%; 

Impurity C≤0.3%; 

Impurity F≤0.15%; 

Impurities A,E≤0.15%; 

Unspecified impurities≤0.1%; 

Total impurities≤0.3%

≤4.0%

≤0.1%

98.5% ~101.5%

It is used for maintenance treatment of chronic obstructive pulmonary disease, including maintenance treatment of chronic bronchitis, emphysema with dyspnea and prevention of acute attack.

Preserve in well-closed, light-resistant containers. Store at room temperature.