Compounds of the formula: ##STR1## are useful in the treatment of diseases associated with herpes viruses including human cytomegalovirus, herpes simplex viruses, Epstein-Barr virus, varicella-zoster virus, human herpesviruses-6 and -7, and Kaposi herpes virus.

Compostos da fórmula: ## do ## STR1 é útil no tratamento das doenças associadas com os vírus do herpes including o cytomegalovirus humano, os vírus simples do herpes, o vírus de Epstein-Barr, o vírus do varicella-zoster-zoster, o herpesviruses-6 e o -7 humano, e do herpes de Kaposi o vírus.