| 摘要 |
<p>The present invention provides a compound of formula (I) Wherein R1 is C¿1-7? alkyl, optionally substituted by hydroxy or NR?4R5; R2¿ is C¿1-7? alkyl substituted by hydroxy or NR?4R5; R3¿ is H, F or C¿1-7? alkoxy; R?4 and R5¿ together with N are a 5- or 6-membered heterocyclic moiety having 1-3 heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur in which sulfur may be substituted by one (1) or two (2) oxygen atoms; and pharmaceutically acceptable salts thereof. Compounds of formula (I) of the present invention are useful as antiviral agents.</p> |
