| http://www.w3.org/ns/prov#value | - Where esters are derived from such acids, each acidic group is preferably esterified by a compound of formula (I) or other nucleoside or analogs and derivatives thereof to provide esters of the formula: ##STR9## where W is --OC--(CH2)n --CO-- where n is an integer of 0 to 10, a phosphate group, or a thiophosphate group, Z and R2 are as defined above, and
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