Appearance White crystals or crystalline powder
Solubility Soluble in water and practically insoluble in alcohol and in ether
Infrared absorption As per FCCVI
Specific rotation [α]D20 +6.3°~ +7.3°
Lead ≤5mg/kg
Loss on drying ≤0.30%
Residue on ignition ≤0.10%
Assay 98.5~101.5%
Melting point 185℃ with decomposition