| 摘要 |
Antiviral activity is exhibited by compounds having the formula <CHEM> and its pharmaceutically acceptable salts wherein R1 is <CHEM> <CHEM> wherein R2 is hydrogen, methyl, fluoro, chloro, bromo, iodo, hydroxy or amino; R3 is fluoro, chloro, bromo, iodo, hydrogen, methyl, trifluoromethyl, ethyl, n-propyl, 2-fluoroethyl, 2-chloroethyl, or <CHEM> wherein R4 is chloro, bromo, iodo, hydrogen methyl or trifluoromethyl; R5 is alkyl; R6 is hydrogen, alkyl, substituted alkyl, or aryl; and R7 and R8 are independently hydrogen, -PO3H2 or - @-R6. |
