Specification
| Appearance | White to almost white crystal | Conform |
| Melting point (℃) | 79.0-83.0 | 80.3-80.9 |
| Specific optical rotation (°) | -2-+2 | 0 |
| Loss on drying (%) | ≤0.5 | 0.05 |
| Residue on ignition (%) | ≤0.1 | 0.01 |
| Heavy metals (ppm) | ≤15 | Conform |
| Related impurities (%) | ≤1.0 | Not detected |
| Contents (%) | ≥99.0 | 100.0 |