HS CODE 2916 3990?
Appearance: white or yellowish crystalline powder
Identification(IR ,UV): Positive
Solubility: conforms
Absorbance:122 –137
Acidity:≤0.50ml/g
Specific rotation: -25°~ -28°

Optical rotation: -1.10°~-1.23°

Residue on Ignition:≤0.1%
Heavy Metals:≤0.001%

Water:10.0-13.0%

3-o-methyl methyldopa and related substances(HPLC):≤0.5%
Assay:98.5-101.0%
Comply with BP2003/EPIV/USP27