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