prov:value
| - ine base; 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 pharmaceutically acceptable salt thereof, optionally in combination
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