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The 2,4-dithio analogues of 2 -deoxyuridine and 2 -deoxy-5-fluorouridine have been synthesized by thiation of the previously described 2-thio analogues, and then phosphorylated enzymatically or chemically to yield 2,4-dithio-dUMP and 2,4-dithio-5-fluoro-dUMP. In striking contrast to the 2-thio and 4-thio analogues of dUMP, which are good substrates of thymidylate synthase, 2,4-dithio-dUMP is not...
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