abstract |
A compound represented by the following structural formula: ** Formula ** or a pharmaceutically acceptable salt thereof, wherein: R 1 is alkyl, cycloalkyl or cycloalkylalkyl; R2 is H or alkyl; R3 is F, Cl, Br, cyano, nitro, alkyl, haloalkyl, alkoxy, haloalkoxy or alkanesulfonyl; and n is 0, 1, 2 or 3. |