trans- and cis-S-C-C-S Conformations in 5-(2,2'-Dithien-5-yl)-2'-deoxyuridine

The title compound, C₁₇H₁₆N₂O₅S₂, adopts a transoid-cisoid disordered crystal structure of the terminal thienyl group at room temperature, with occupancies of 0.55 and 0.45. The structure was solved by direct methods and refined by least-squares calculations to a final R of 0.048. Molecular cohesion is stabilized by hydrogen bonding involving the two hydroxyl groups of the sugar moiety and the uridine ring.

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