[5′-O-DMTr-2′-OMe-U](pCyEt)[5′-O-DMTr-2′-OMe-A(Bz)-3′-CE-Phosphoramidite]

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