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| ITEM | STANDARD |
| Appearance | Yellow or orange crystalline powder.almostodourless |
| IdentificationUltraviolet AbsorptionA256/A365 | Between 2.80 and 3.00 |
| Water | ≤8.5% |
| Chromatographic purity | ≤2.0 % |
| Residue on ignition | ≤0.3% |
| Organic volatile impurities | Meet the requirements |
| Assay | 96.0~102.0% |