N4-[4-(N-Fmoc-N-methyl-amino)butyryl]-5′-O-DMTr-2′-dC-3′-CE-Phosphoramidite

N4-[4-(N-fluorenylmethyloxycarbonyl-N-methyl-amino)butyryl]- 5'-O-(4, 4'-dimethoxytrityl)-2'-deoxy-cytidine-3'-(2-cyanoethyl)-(N, N-diisopropyl)-Phosphoramidite