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5-O-TBDMS-2-deoxyuridine

5-O-TBDMS-N2-isobutyryl-2-deoxyguanosine

5-O-TBDMSoxy-5-Fluoro-2-deoxyuridine

5-Trt-N6-Bz-2-dA

5-O-dimethoxytrityl-N4-benzoyl-2-deoxycytidine

5-Trt-N2-ibu-2-dG

N4-acetyl-O5-trityl-2deoxy-cytidine