| abstract |
A compound of the general formula (1) and pharmaceutically acceptable salts thereof in which X and Y are independently N or C-R 7; R 1 is C1-C6 alkoxy, C1-C6 alkyl or halogen; R 3 is C1-C6 alkyl; R 4, R 5, R 6 and R 7 are independently hydrogen, C1-C6 alkoxy, C1-C6 alkyl, C1-C6 haloalkyl, C1-C6 alkylcarbonyl, halogen, cyano or nitro. |