CAS number： 70500-72-0
Molecular formula： C9H7NO2
molecular weight： 161.157
Chemical structure：
| Items | Specifications | Results |
| Appearance | Off-white to light brown powder | Off-white powder |
| Solubility | Sparingly soluble in Dimethylformamide | Comply |
| Identification(IR) | Conform to the structure | Comply |
| Loss on drying | Not more than 0.5% | 0.02% |
| Related substances(HPLC) | T083-01:NMT0.1% | 0.05% |
| Other individual impurity: NMT0.15% | 0.02% | |
| Total impurities: NMT1.0% | 0.07% | |
| Water (KF) | Not more than 0.5% | 0.18% |
| Residue on ignition | Not more than 0.5% | 0.14% |
| Assay | 98.0%-102.0% | 101.0% |
