3-Cyano-5-fluoro-2-(trifluoromethoxy)pyridine-6-carboxylic acid
3-Cyano-4-fluoro-6-(trifluoromethoxy)pyridine-2-carboxylic acid
6-Fluoro-4-iodo-3-(trifluoromethoxy)pyridine-2-carboxylic acid
2-Fluoro-4-iodo-3-(trifluoromethoxy)pyridine-5-carboxylic acid