[5′-O-DMTr-5-Me-2′-dU](pCyEt)[5-Me-2′-dU-3′-CE-Phosphoramidite]

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