[5′-O-DMTr-2′-dG(iBu)](pCyEt)[2′-dG(iBu)-3′-CE-Phosphoramidite]

[5'-O-(4, 4'-dimethoxytrityl)-2'-deoxyguanosine(isobutyryl)](pCyEt)[2'-deoxyguanosine(isobutyryl)-3'-cyanoethyl-Phosphoramidite]