| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | White crystals | Conforms |
| Identification | Positive | Conforms |
| Melting point | 226℃~230℃ | 226.8℃~228.8℃ |
| Specific rotation | -123°~-127° | -125° |
| Water | ≤5.00% | 3.54% |
| Ammonium salts | ≤25ppm | 20ppm |
| Arsenic | ≤2ppm | 1ppm |
| Benzoic and salicylic acid | No precipitate or violet color appears | Conforms |
| Heavy metals | ≤10ppm | 0.5ppm |
| P-toluene sulfonamide | ≤10ppm | 4ppm |
| O-toluene sulfonamide | ≤10ppm | 6ppm |
| Selenium | ≤30ppm | 5ppm |
| PH value | ------------- | 6.24 |
| Benzoic acid-sulfonamide | ≤25ppm | 10ppm |
| Assay | 99.0%~101.0% | 99.32% |
| Conclusion: The Product Conforms to USP/BP/EP/FCC. |
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