2,6-二氯嘌呤

3’,5’-O-(1,1,3,3-四异丙基-1,3-二硅氧烷)鸟苷

3',5'-O-(1,1,3,3-tetraisopropyldisiloxane-1,3-diyl)-2'-ketoguanosine

N2-isobutyryl-9-(2-O-isobutyryl-β-D-arabinofuranosyl)guanine

(2R,3S,4R,5R)-2-(2-isobutyramido-6-oxo-1H-purin-9(6H)-yl)-4-((tetrahydro-2H-pyran-2-yl)oxy)-5-(((tetrahydro-2H-pyran-2-yl)oxy)methyl)tetrahydrofuran-3-yl isobutyrate