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Various 5-alkyl-6-aza-5,6-dihydrouridines and 6-(β-D-ribopyranosyl)-5-alkyl-6-aza-5,6-dihydrouracils have been synthesized. A new regioselective method is described for coupling triazinic bases to the sugar unit. Different epimers were isolated. Antiretroviral activity against Visna virus was evaluated.
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