| abstract |
A compound of formula (I), wherein R1 is chloro, difluoromethyl, trifluoromethyl or cyano, R2 is (a), (b), or (c), wherein X is halogen, cyano, nitro or amino, Y1 and Y2 are respectively lower alkyl or lower alkoxy, Y3 is ethyl, n-propyl or isopropyl, and Z is hydrogen or halogen, processes for their preparation and pharmaceutical compositions. |