| S.No | Test | Specification |
| 1. | Description | A yellowish green to brown colour crystalline powder. |
| 2. | Solubility | Sparingly soluble in toluene after warming. |
| 3. | Melting range | 140˚C to 145˚C. |
| 4. | Loss on drying | Not more than 10.0%(w/w). |
| 5. | Residue on ignition | Not more than 0.2% |
| 6. | Purity by HPLC | Not less than 95.0%. |