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