[5'-O-DMTr-2'-OMe-U](pCyEt)[2'-OMe-G(iBu)](pCyEt)[2'-OMe-G(iBu)-3'-CE-Phosphoramidite]

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