SPECIFICATION
| Appearance | Yellow or yellow-brownish, or yellowish-orange, colorless, crystalline powder. |
| Identification | UV absorption: The ratio A256/A365 is between 2.80 and 3.00. |
| Assay | 97.0-102.0% |
| Water | ≤8.5% |
| Residue on ignition | ≤0.3% |
| Residual solvent | No solvent is used or produced in the manufacture of the product. |
| Related compounds | Total impurities ≤2.0% |
MOLECULAR STRUCTURE：
Molecular Formula: C19H19N7O6
