TESTSTANDARD RESULT Appearance White or light yellow crystalline powder Light yellow crystalline powder Identification(IR) Corresponding Complies Specific Rotation -75° -88° -79° Specific absorbance 500-550 535 Acidity 2.6 4.1 3.5 Water 9.0-12.0% 10.4% Crystallinity Meets the requirements Complies Related substances(HPLC) Largest single impurity Total impurities Not more than 1.0% Not more than 2.0% 0.2% 0.4% Assay 950-1030ug/mg(on anhydrous basis) 980ug/mg Conclusion: Complies with the standard of USP 30.