2-nitrobenzyl (9-((2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-6-oxo-6,9-dihydro-1H-purin-2-yl)carbamate

3',5'-bis-O-trimethylsilyl-2'-deoxyguanosine

2-deoxy-α-D-ribofuranose 1-phosphate

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

5',3'-bis(O-tert-butyldimethylsilyl)-6-N-(2,2'-bis(2-nitrophenyl)ethyloxycarbonyl)-2'-deoxyguanosine