[5′-O-DMTr-5-Me-2′-dU](pCyEt)[5-Me-2′-dU-3′-succinate], TEA salt

[5'-O-DMTr-5-Methyl-2'-deoxyuridine](pCyEt)[5-Methyl-2'-deoxyuridine-3'-succinate], triethylamine salt