2-(Bromomethyl)-3-(trifluoromethoxy)-4-(trifluoromethyl)pyridine-6-carboxylic acid
4-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-3-acetic acid
3-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-6-acetic acid
4-(Difluoromethyl)-3-nitro-5-(trifluoromethoxy)pyridine-2-acetic acid