5′-O-DMTr-2′-dC(Bz)-3′-O-[(N, N-diisopropyl)-P-heptyl]phosphonamidite

N4-benzoyl-5'-O-(4, 4'-dimethoxytrityl)-2'-deoxy-cytosine-3'-[(N, N-diisopropyl)-P-heptyl]-Phosphonamidite