prov:value
| - , triphosphate, or a stabilizedphosphate 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, ora pharmaceutically acceptable salt thercof, optionally in combination with a pharmaceutically acceptable carrier.20.
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