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5-Trifluoroacetamido-5-deoxythymidine

5-Propynyl-2-deoxyuridine

5-P-fluorosulfonyl-benzoyladenosinehydrochloride

5-O-triphenylmethyl-adenosine

5-O-tert-butyldimethylsilyl-thymidine

5-O-methylthymidine

5-O-benzoyl-3-azido-3-deoxythymidine

5-O-acetyl-2-3-dideoxy-3-fluoro-uridine

5-O-(dimethoxytrityl)-n6-methyl-2-deoxyadenosine

5-O-(dimethoxytrityl)-5-iodo-2-deoxyuridine