prov:value
| - Base is a purine base; R1 is H, OR3, N3, CN, halogen, CF3, lower alkyl, amino, loweralkylamino or di(lower)alkylamino; R2 is H, monophosphate, diphosphate, triphosphate, or a stabilized phosphate prodrug, acyl, phosphate, phosphonate, a lipid or an amino acid; and R3 is acyl, alkyl, phosphate, or other pharmaceutically acceptable leaving group which when administered in vivo, is capable of being c
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