Specification:
| Appearance | Light yellow crystal | Conform |
| Assay (%) | ≥99.0 | 99.45 |
| Melting point (℃) | 91.0-94.0 | 92.1-93.3 |
| Volatilization (%) | ≤0.1 | 0.05 |
| Acid value (%) | ≤0.5 | 0.2 |
| Clarity (%) | Transparent | Conform |
| Appearance | Light yellow crystal | Conform |
| Assay (%) | ≥99.0 | 99.45 |
| Melting point (℃) | 91.0-94.0 | 92.1-93.3 |
| Volatilization (%) | ≤0.1 | 0.05 |
| Acid value (%) | ≤0.5 | 0.2 |
| Clarity (%) | Transparent | Conform |