Unlike compound 1, which has been shown to have marked activity against herpes viruses,'- 3 compounds 2-4 did not prove inhibitory to these (HSV-1, HSV-2, VZV, and CMV) and other viruses (W and VSV)(Tables I and 11) that included the wild-type thymidine kinase-positive (TK+) variants of HSV-1 or VZV and thymidine kinase-