| 摘要 |
This invention concerns compounds of the formula: <IMAGE> and the N-oxides and the pharmaceutically acceptable salts thereof wherein R1 is phenyl unsubstituted or substituted by fluoro chloro, bromo, alkyl of 1 to 3 carbon atoms or alkoxy of 1 to 3 carbon atoms; R2 is hydrogen or alkyl of 1 to 4 carbon atoms; R3 is hydrogen, nitro, amino, <IMAGE> in which R4 is alkyl of 1 to 4 carbon atoms unsubstituted or substituted with up to three chlorine atoms or with three fluorine atoms on the same carbon atoms; R5 is alkyl of 1 to 4 carbon atoms n has a value of 0, 1 or 2.
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