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

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