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N-Formylacetamide

(2-OMe-5-MP-A)pG

N-(2-Phenoxyacetyl)guanosine

N2-Isobutyryl-2-Fluoro-2-deoxyguanosine

5-O-(4,4-dimethoxytrityl)-N4-acetyl-5-iodo-deoxycytosine

5-O-TBDMS-2-deoxyuridine

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