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