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- Nucleosides 3a-d were synthesized from commercially available 2′-deoxy-5′-O-di-metoxytritylthymidine, 2′ -deoxy-5′ -O-dimethoxytrityl-N4-benzoylcytidine, 2′-deoxy-N6-benzoyladenosine, and 2′-deoxy-N2-isobutyrylguanosine by acetylation with acetic anhydride in pyridine followed by removal of dimetoxytrityl group by treatment with 80% acetic acid