4-Cyano-6-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-carboxylic acid
4-Cyano-2-(difluoromethyl)-3-(trifluoromethoxy)pyridine-5-carboxylic acid
5-Cyano-3-(difluoromethyl)-4-(trifluoromethoxy)pyridine-2-carboxylic acid
3-(Chloromethyl)-5-fluoro-2-hydroxy-4-(trifluoromethoxy)pyridine