prov:value
| - A pharmaceutical composition comprising an effective anti-HBV amount of a compound of the formula: or a pharmaceutically acceptable salt thereof, wherein R2 is an amino acid residue; and R3 and R4 are independently H, straight chained, branched or cyclic alkyl, dialkylaminoalkylene (in particular, dimethylaminomethylene), CO-alkyl, CO-aryl, CO-alkoxyalkyl, CO-aryloxyalkyl, CO-substituted aryl, alk
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