9-(3-Phosphonomethoxyprop-1-en-yl)adenine (Z)- and (E)-isomers were synthesized. The stereoselectivity of double bond formation was studied by variation of sulfonyl groups. The resulting phosphonates exhibited a moderate antiherpetic activity in a culture of Vero cells infected with herpes simplex type 1 virus. The Z-isomer was shown to be more effective inhibitor of virus reproduction in the case of both wild and acyclovir-resistant strain.
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