Characteristics：         white or almost white crystal powder

Melting Point:              160℃ ～ 167℃

Specific Rotation          -16°～ -21°

Chlorides                     ≤0.02%

Heavy metals                  ≤20ppm

Loss on drying                ≤1.0%

Residue ignition               ≤0.2%

Assay                       98% ～ 100.5%

Standard:                Enterprise standard