| Inspection items | Technical index |
| Appearance | White or off-white crystalline powder |
| Identification | The chemical reaction was positive with maximum absorption at 314nm and 274nm, and minimum absorption at 295nm and 244nm |
| Melting point | 48.0～53.0℃ |
| Clarity and colour of solution | The solution is clear and colorless |
| Chloride | NMT 0.01% |
| Sulphate | NMT 0.03% |
| LOD | NMT 0.50% |
| ROI | NMT 0.10% |
| Heavy metals | NMT 10ppm |
| Related impurities | |
| Unidentified impurities | NMT 0.10% |
| Total | NMT 0.20% |
| Contents | 98.0～102.0% |
