| Item | Specifications |
| Appearance | White or off-white powder |
| Identification(HPLC) | The IR spectrogram conforms to the characteristic peak of R.S. |
| The maximum absorption should be in 214nm±2nm | |
| The retention time of the major peak in the chromatogram conforms to the characteristic peak of R.S. | |
| Melting point | 248.6-252.3℃ |
| Residual solvents | Methylene chloride ≤600ppm |
| Ethanol ≤5000ppm | |
| Acetone ≤400ppm | |
| Hexane ≤290ppm | |
| DMF ≤880ppm | |
| THF ≤720ppm | |
| Heavy metals | ≤10ppm |
| Assay(HPLC) | ≥95% (a and b) |
