Items	Specifications	Results
Characteristic	White or almost white needles crystals,crystalline powder	White crystalline powder
Melting point	225~230℃	225~228℃
Specific optical rotation	Not less than -121.5°	-125.6°
Chemical reaction	positive	positive
Infrared Absorption	Conforms to the reference spectrum	Comforms
Clarity of solution	Comply	Comply
Acidity	PH3.5~5.0	4.0
Light absorption	Not greater than 0.20	0.01
2-Iminothiazolidine ervatives	Not more than 0.04%	Comply
Loss on drying	Not more than 0.5%	0.1%
Residue on ignition	Not more than 0.1%	0.02%
Assay	Not less than 98.5% of C11H12N2S.HCl(on the dried basis)	100.0%