3-(Difluoromethyl)-4-fluoro-6-(trifluoromethoxy)pyridine-2-carboxylic acid
6-Cyano-3-(difluoromethyl)-2-(trifluoromethoxy)pyridine-4-acetic acid
3-(Difluoromethyl)-4-fluoro-2-(trifluoromethoxy)pyridine-6-carboxylic acid
2-Cyano-4-(difluoromethyl)-6-(trifluoromethoxy)pyridine-3-acetic acid