Identification

Colorless, transparent hexagonal or needle like crystals

Melting point

41~44℃

Solubility 

1g soluble in 5ml of 90% v/v alcohol, forming a clear solution

Optical rotation (25℃)

-45°～-51°

Limit of Nonvolatile residue (%)

Not overrun 0.05 under condition of 105℃

Individual impurities

≤0.3%

Total impurities

≤2.0%

Chromatographic purity

98%–102% on the dried basis 

Heavy metals

≤10ppm

As content

≤3ppm

Residue on ignition

≤0.1%

Related substances

Examine by gas chromatography