(2'S)-3'5'-O-(tetraisopropyldisiloxane-1,3-diyl)-2'-deoxy-2'-C-methylcytidine

1-((2R,4S,5R)-5-(((tert-butyldimethylsilyl)oxy)methyl)-4-(((diisopropylamino)(vinyl)phosphaneyl)oxy)-3-methylenetetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

2'-deoxy-2'-α-methyl-N4-benzoylcytidine

6,2'-methano-cyclouridine

5'-O-(tert-butyldimethylsilyl)-2'-deoxy-2'-C-methyleneuridin-3'-yl 3'-O-(tert-butyldimethylsilyl)thymidin-5'-yl vinylphosphonate