| http://www.w3.org/ns/prov#value | - In another aspect of the invention, there are provided nucleoside analogs and prodrugs of Formula 3, in which the sugar is either in the L- or D-configuration: wherein R1 is a masking group having any of the following structures: where X is O or S; and wherein R is C1-C18 alkyl, alkenyl, alkynyl, aryl, and aralkyl, straight or branched, and wherein the 5???-OH group may further be modified to form
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