prov:value
| - r)alkylamino; R.sup.2 is H, monophosphate, diphosphate, triphosphate, a stabilized phosphate prodrug; acyl,phosphate, phosphonate, a lipid or an amino acid; and R.sup.3 is acyl, alkyl, phosphate, or other pharmaceutically acceptable leaving group which when administered in vivo, is capable of being cleaved to the parent compound, or a pharmaceuticallyacceptable salt thereof, optionally in combinat
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