O6-benzyl-3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxyguanosine

3',5'-bis-O-(tert-butyldimethylsilyl)-O2-(4-methylbenzenesulfonyl)-2'-deoxyxanthosine

7-{6-benzyloxy-9-[4-(tert-butyldimethylsilyloxy)-5-(tert-butyldimethylsilyloxymethyl)-tetrahydrofuran-2-yl]-9H-purin-2-ylamino}-6-(tert-butyldimethylsilyloxymethyl)-6H-benzo[f][1,3]dioxolo[4',5':4,5]benzo[1,2,3-cd]indol-5-one

O6-benzyl-3',5'-bis-O-(tert-butyldimethylsilyl)-O2-(4-methylphenylsulfonyl)-2'-deoxyxanthosine

O6-benzyl-2-chloro-3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxyguanosine

(2R,2'R,3S,3'S,5R,5'R)-5,5'-(azanediylbis(6-(benzyloxy)-9H-purine-2,9-diyl))bis(2-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)tetrahydrofuran-3-ol)

N2-(2-amino-9H-fluoren-3-yl)-3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxyguanosine

6-N-(2-(5'-O-3'-O-bis(tert-butyldimethylsilyl)-6-O-benzyl-2'-deoxyinosyl))-5'-O-3'-O-bis(tert-butyldimethylsilyl)-2'-deoxyadenosine

2-N-(2-(5'-O-3'-O-bis(tert-butyldimethylsilyl)-6-O-benzyl-2'-deoxyinosyl))-5'-O-3'-O-bis(tert-butyldimethylsilyl)-6-O-benzyl-2'-deoxyguanosine

N2-(2-nitronaphth-1-yl)-O6-benzyl-3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxyguanosine

O6-benzyl-3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxyxanthosine

2-(2-Amino-naphthalen-1-ylamino)-9-[(2R,4S,5R)-4-(tert-butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-1,9-dihydro-purin-6-one

N2-(2-acetylamino-5-(phenyl)phenyl)-3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxyguanosine

(2R,3S,5R)-5-(6-(benzyloxy)-2-((9-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-9H-purin-6-yl)amino)-9H-purin-9-yl)-2-(hydroxymethyl)tetrahydrofuran-3-ol

5'-O-3'-O-bis(tert-butyldimethylsilyl)-6-O-benzyl-2-N-benzyl-2'-deoxyguanosine