N4-[(2-cyanoethoxy)carbonyl]cytidine

4-N-methoxycarbonyl-3',5'-O-(1,1,3,3-tetraisopropyldisiloxan-1,3-diyl)cytidine

5'-O-(4,4'-dimethoxytrityl)-3'-O-(tert-butyldimethylsilyl)-4-N-<2-<(tert-butyldiphenylsilyloxy)methyl>benzoyl>cytidine

5'-O-(4,4'-dimethoxytrityl)-2'-O-(tert-butyldimethylsilyl)-4-N-<2-<(tert-butyldiphenylsilyloxy)methyl>benzoyl>cytidine

5'-O-(4,4'-dimethoxytrityl)-2'-O-(tert-butyldimethylsilyl)-4-N-<2-<(tert-butyldiphenylsilyloxy)methyl>benzoyl>cytidinosyl 2-cyanoethyl N,N-diisopropylphosphoramidite