| 
| 
| Description | White or almost white crystalline powder  |  
| Loss on drying | ≤1.0% |  
| Residue on ignition | ≤0.5% |  
| Heavy metals | ≤20ppm |  
| Assay(UV)  | 99.0-102.0% |  
| Purity(HPLC) | ≥99.0% |  
| Guanine | ≤0.10% |  
| Each of Inosine, N-Acetyl hypoxanthine and other impuritiles | ≤0.5% |  
| Packing  | 25kg/barrel |  
| Storage  | Keep dry, stable at room temperature. |  |  |