Structural formula:

Molecular formula : C₁₅H₁₂CLNO₂

Molecular weight : 273.73

Property : It is white crystal powder, easily soluble in aether, acetone or ethyl acetate,sodium hydroxide solution or sodium carbonate solution, almost insoluble in water.

Specification: Enterprise standard(USP32 version Pharmacopoeia)

    Appearance:White crystalline powder; No visible evidence of contamination by foreign matter.

    Loss on drying:Not More Than 0.5%

    Residue on lgnition: Not More Than 0.1%

    Heavy metals:Not more than 20ppm

    Single unknown impurities: ≤ 0.10%

    Carbazole : ≥ 0.5%

    Ketal : ≥ 0.5%

    Hexachlorocyclohexane dual acid carbazole : ≥ 0.5%

    Single known impurities: ≤ 0.5%

    Total impurities:Not More Than 1.0%

    Assay:98.0% to 102.0% on the dried basis

Use : It is used in the treatment of rheumatoid arthritis,osteoarthritis ,acute gout and tendonitis etc.