Appearance：White or almost white crystalline powder, without stink. Taste bitter.

Solubility：Almost insoluble in water; Soluble in methanol and in glacial acetic acid; Slightly soluble in chloroform.

Identification：EP 6.0

Specific Optical Rotation：+59.5°

Chloride：≤ 0.02%

Sulfate：≤ 0.05%

Arsenic Salt：≤ 2ppm

Melting Point：200.9-202.7℃

Loss on Drying：0.04％

Lazing Residue：0.08％

Heavy Mental：≤ 10ppm

Assay (Titration)：99.3％