Characteristics White to pale yellow, crystalline powder Melting range 167°~171° Specific rotation -442°~-462° Loss on drying ≤0.5% Residue on ignition ≤0.1% Heavymetals ≤0.002% Chromatographic purity ≤2.0% Assay 98.0% ~ 102.0% Standard USP29
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