Compounds and pharmaceutical compositions active against hepatitis B virus are provided, as is a method for the treatment of hepatitis B virus infection in humans and other host animals is provided comprising administering an effective amount of a .beta.-L-(2'or 3'-azido)-2',3'-dideoxy-5-fluorocytosine of the formula ##STR1## wherein R is H, acyl, monophosphate, diphosphate, or triphosphate, or a stabilized phosphate derivative (to form a stabilized nucleotide prodrug), and R'is H, acyl, or alkyl.

Os compostos e as composições pharmaceutical ativas de encontro ao vírus do hepatitis B são fornecidos, como é um método para o tratamento da infecção do vírus do hepatitis B nos seres humanos e outros animais do anfitrião são compreender fornecido administrando uma quantidade eficaz de um beta.-L-(2'or 3'-azido)-2', 3'-dideoxy-5-fluorocytosine do ## do ## STR1 da fórmula wherein R é H, acyl, monophosphate, diphosphate, ou triphosphate, ou um derivative estabilizado do phosphate (para dar forma a um prodrug estabilizado do nucleotide), e R'is H, acyl, ou alkyl.

 
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