2-Bromo-3-cyano-4-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Chloro-4-hydroxy-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride
3-Amino-2-chloro-4-(difluoromethyl)-6-fluoropyridine
4-(Chloromethyl)-6-(difluoromethyl)-3-(trifluoromethyl)pyridine-2-sulfonyl chloride