4-Cyano-3-hydroxy-6-(trifluoromethoxy)pyridine-2-carboxylic acid
2-Fluoro-5-hydroxy-4-methoxy-3-(trifluoromethoxy)pyridine
2-Fluoro-3-(difluoromethyl)-6-hydroxy-4-(trifluoromethoxy)pyridine
2-Fluoro-3-(difluoromethyl)-4-hydroxy-6-(trifluoromethoxy)pyridine