Appearance A white or almost white crystalline powder
Identification The infrared absorbance spectrum is concordant with the reference spectrum
Appearance of solution The solutioiin are not more opalescent than ref. Suspension II
PH 3.5-5.5
Specific rotation +290°~ +315°
Related substances 1.0% max
N.N-Dimethylaniline 20ppm max
Water 11.5-14.5%
Sulphated ash 1.0% max
Assay, on dry base 95%-102%
Conclusion Complies with standard of BP2012.