4-Cyano-3-fluoro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
4-Cyano-6-fluoro-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
4-Cyano-2-fluoro-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Fluoro-6-iodo-3-(trifluoromethoxy)pyridine-5-acetic acid