Lamivudine

Absorptivity    Not more then 0.0015             0.0001

Water by K.F. Not more than 0.2%        0.07%

Limit of lamivudine enantiomer     Not more then 0.3%      ND

Related substance by HPLC   Not more then 0.3% of any peak at relative retention time of about 0.4                   0.02%

Not more then 0.2% of any peak at relative retention time of about 0.9

Not more then 0.1% of salicylic acid   

Not more then 0.1% of other individual impurity

Not more then 0.6% of total impurity

Limit of residual solvent Not more then 0.2% of alcohol

Not more then 0.05% of etyl acetate

Not more then 0.2% of isopropyl acetate

Not more then 0.1% of methanol

Not more then 0.2% of isopropanol

Not more then 0.089% of toluene

Not more then 0.1% of triethylamine

Not more then 0.3% of total residual solvents     

complies

Assay (By HPLC)   98.0%～102.0 %（C8H11N3O3S）               99.7%   

Testing specifications     In-house standard