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5-Methoxymethyl-1-(2'-deoxy-beta-D-lyxofuranosyl)uracil (MMdLU) was not active against the herpes simplex viruses. The relationship between molecular conformation and antiviral activity for the two epimers, 5-methoxymethyl-2'-deoxyuridine (MMdUrd) and MMdLU, is discussed. MMdUrd was phosphorylated by the virus-induced deoxythymidine kinase. In contrast, MMdLU did not serve as a substrate for the kinase. The geometry and distance between the 5'-CH2OH and 3'-OH groups of the furanose ring appear to be key factors in determining the efficiency of phosphorylation by the virus-induced deoxythymidine kinase, and hence antiviral activity.
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