| TESTING ITEMS | SPECIFICATION | RESULTS |
| Appearance | White crystalline powder | Conforms |
| Melting point | 128℃~132℃ | 128.6℃~129.4℃ |
| Loss on drying | ≤1.0% | 0.26% |
| Specific optical rotation | -15.7°~-17.3° | -16.17° |
| Residue on ignition | ≤0.1% | 0.04% |
| Heavy metals | ≤20ppm | 10ppm |
| Absence of reducing substance | The color of the solution does not change | Conforms |
| Completeness and color of the solution | Absorbance ≤0.03% | 0.01% |
| Assay(on the dried basis) | 99.0%~100.5% | 99.54% |
| Conclusion: The Product Conforms to USP. |
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