Appearance White crystals or crystalline powder Indentification(IR) Conforms to standard spectrum Assay 98.5-101.0% Chromatographic purity(TLC) Total impurities: 2.0%max Individual impurities: 0.5% max Specific rotation +14.0°~ +15.6° Chloride(as Cl) 0.05% max Sulphate 0.02% max Iron 0.003% max Heay metals(as Pb) 0.0015% max Loss on drying 0.2% max Residue on ignition 0.1% max Solution transmittance 98.0%min

Appearance White crystals or crystalline powder Assay 98.5%~101.5% Speciific rotation -27.6°~-29.0° PH 5.0-6.5 Chloride 0.02% max Ammonium 200ppm max Sulfate 0.02% max Hevy metals 10PPM max Arsenic 1 PPM max Iron 10PPM max Other amino acids 0.5% max Residue on ignition 0.1% max Loss on drying 0.2% max

White to creamy-yellow crystalline powder,50%min, PH 5.5-7.5, Loss on drying 8.0% max, heay metals 10ppm max

Appearance White crystals or crystalline powder Assay 98.5-101.5% PH 5.4-6.0 Specific rotation (20/D) -32.7°~ -34.7° Heay metals(as Pb) 15ppm max Chloride 0.05% max Sulfate 0.03% max Iron 0.003% max Loss on drying 0.2% max Residue on ignition 0.4% max

Appearance White crystals or crystalline powder Identification IR: Complies with the ref. spectrum Assay 98.5-101.5% Chromatagraphic purity Complies Specific rotation (20/D) -9.8°~ -11.2° Hevy metals(as Pb) 0.0015% max Chloride 0.04% max Sulfate 0.04% max Iron 0.003% max Organic volatile impurities Meets the requirement Loss on drying 0.3% max Residue on ignition 0.4% max