Particularly preferred 3,5-disubstituted phenyls include, by way of example , 3,5-dichlorophenyl , 3,5-difluorophenyl , 3,5-di (trifluoromethyl) phenyl , 3,5-dimethoxyphenyl, and the like.
Preferred 3,4-disubstituted phenyls include, by way of example , 3,4-dichlorophenyl , 3,4-difluorophenyl , 3- (trifluoromethyl) -4-chlorophenyl , 3-chloro-4-cyanophenyl , 3-chloro-4-iodophenyl , 3,4-methylenedioxyphenyl, and the like.