| abstract |
Antiviral activity is exhibited by compounds having the formula <IMAGE> 1 and its pharmaceutically acceptable salts wherein R1 is <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> wherein R2 is hydrogen, methyl, fluoro, chloro, bromo, iodo, hydroxy or amino; or trifluoromethyl; R5 is alkyl; R6 is hydrogen, alkyl, substituted alkyl, or aryl; and R7 and R8 are independently hydrogen, <IMAGE> |