3',5'-O-bis(tert-butyldimethylsilyl)-2-N-[N-(trans-4-levulinyloxycyclohexyl)-N-methylcarbamoyl]deoxyguanosine

(1R,4r)-4-(3-(9-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-6-oxo-6,9-dihydro-1H-purin-2-yl)-1-methylureido)cyclohexyl 4-oxopentanoate

5'-O-(4,4'-dimethoxytrityl)-2-N-[N-(trans-4-levulinyloxycyclohexyl)-N-methylcarbamoyl]deoxyguanosine

5'-O-(4,4'-dimethoxytrityl)-2-N-[N-(trans-4-levulinyloxycyclohexyl)-N-methylcarbamoyl]deoxyguanosine 3'-(2-cyanoethyl-N,N-diisopropylphosphoramidite)

9-((2R,4S,5R)-4-((tert-butyldimethylsilyl)oxy)-5-(((tert-butyldimethylsilyl)oxy)methyl)tetrahydrofuran-2-yl)-2-ureido-9H-purin-6-yl diphenylcarbamate