| abstract |
In the compounds of the present invention, R 1 is hydrogen, C 1 -C 4 alkyl, halogen, trifluoromethyl, trifluoromethoxy, cyano or nitro, R 2 is halogen, trifluoromethyl, trifluoromethoxy, cyano or nitro, R 3 is C 4 -C 7 alkyl or may be substituted with multiple fluorine atoms or chlorine atoms, R4 is hydrogen or halogen, A is oxygen or NH. The present invention relates to the preparation of aforementioned compounds and pharmaceutical compositions containing them. SHE |