Items | Standard |
Appearance | Yellow or orange crystalline powder |
Ultraviolet absorption | A256/A365=2.8-3.0 |
Assay | 97.0%-102.0% |
Water | Not more than 8.5% |
Residue on ignition | Not more than 0.3% |
Related substances | Not more than 2.0% |
Residual solvents | Meet the requirements |