5'-O,5'''-O-(4-Methylsulfonylphenoxyphosphinylidene)bis[5-[(E)-2-bromoethenyl]-2'-deoxyuridine] C??? ??, ??, ??

5'-O,5'''-O-(4-Methylsulfonylphenoxyphosphinylidene)bis[5-[(E)-2-bromoethenyl]-2'-deoxyuridine] ?? ?? ? ???

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5'-O,5'''-O-(4-Methylsulfonylphenoxyphosphinylidene)bis[5-[(E)-2-bromoethenyl]-2'-deoxyuridine] ?? ??