| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | Off-white or light yellow crystalline powder | Conforms |
| Identification | Meet the requirement | Conforms |
| Melting point | 225℃~230℃ | 228℃ |
| Light absorption | ≤0.20% | 0.03% |
| Loss on drying | ≤0.50% | 0.12% |
| Residue on ignition | ≤0.10% | 0.04% |
| PH | 3.5~5.0 | 4.3 |
| Assay | 98.5%~102.0% | 99.60% |
| Conclusion: The Product Conforms to CP/USP. |
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