| 摘要 |
Compounds of the formula <IMG> wherein R1 is selected from <IMG>, <IMG>, <IMG>, or <IMG> Y is a bond or lower alkylene; R2 and R3 are independently hydrogen, lower-alkyl or halogen; R4 is <IMG>, <IMG>, COOR9 or <IMG> R5 is hydrogen, lower-alkyl or halogen; R6 is hydrogen, lower-alkyl or halogen; R7 is hydrogen or lower-alkyl; R8 is hydrogen, lower-alkyl, or trifluoromethyl; R9 is lower-alkyl; R10 is lower-alkyl, trifluoromethyl or difluoromethyl; or pharmaceutically acceptable acid addition salts thereof are useful as antiviral agents.
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