Items	Specifications	Results
Characteristic	A white,almost white crystalline powder	Comply
Completeness of solution	≤0.5	<0.5
Melting point	190~192℃	192℃
Specific rotation	+20.5°~+21.5°	+211.1°
Solution extinction value	≤0.03	0.004
Loss on drying	≤0.5%	0.02%
Residue on ignition	≤0.1%	0.03%
Heavy metals	≤0.001%	<0.001%
Assay	≥99.0%	99.9%