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
5-Cyano-3-fluoro-4-(trifluoromethoxy)pyridine-2-sulfonyl chloride