2-Cyano-4-fluoro-5-(trifluoromethoxy)pyridine-3-sulfonyl chloride
2-Cyano-3-fluoro-6-(trifluoromethoxy)pyridine-5-sulfonyl chloride
3-Chloro-2-methoxy-4-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Cyano-3-fluoro-5-(trifluoromethoxy)pyridine-4-sulfonyl chloride