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