Appearance

Pale white or White powder 

White powder

Melting Point

228.0°C～231.0°C

229.3°C~230.1°C

Loss on drying

≤0.5%

0.31%

Optical rotation, 

(C=0.5g/ml, DMSO)

-37.0°~ -41.0°

-40.95°

Residue on ignition

≤0.1%

0.07%

Purity

≥99.0%

99.5%