CAS number： 134678-17-4
Molecular formula： C8H11N3O3S
molecular weight： 229.26
Chemical structure：
| Item | Requirements |
| Description | White to off- white crystalline powder |
| Light Absorption | Not more than 0.015(440nm,4cm cell, 50mg/ml) |
| Water | ≤0.20% |
| Light absorption(50mg/ml,440nm,4cm) | ≤0.0015 |
| Limit of Lamivudine enantiomer | ≤0.30% |
| Salicylic acid | ≤0.10% |
| Total impurities | ≤0.60% |
| Other individual impurity | ≤0.10% |
| Relative retention time at about 0.4 impurity | ≤0.30% |
| Relative retention time at about 0.90 impurity | ≤0.20% |
| Total residual solvents | ≤0.3% |
| Ethanol | ≤0.20% |
| n-Hexane | ≤0.029% |
| Methylene dichloride | ≤0.06% |
| TEA | ≤0.10% |
| DMF | ≤0.088% |
| Ethyl acetate | ≤0.20% |
| Toluene | ≤0.089% |
| Assay(On the anhydrous and solvent-free basis) | 98.0%~102.0% |
