| Testing Items | Specifications |
| Appearance | Light yellow to yellow powder |
| Odour | Characteristic odour |
| Identification(IR) | Conforms to Standard |
| Assay(HPLC) | Not less than 98.0% |
| Total Impurities(HPLC) | Not more than 2.0% |
| Absorbance(UV-VIS, 10mg/L, propan-2-ol, 341nm,1cm) | Not less than 0.790 |
| Absorption(UV-VIS, 1% dil./1cm) | Not less than 790 |
| Volatile Matter | Not more than 0.5% |