2-Bromo-5-hydroxy-6-(trifluoromethoxy)pyridine-3-sulfonyl chloride
Methyl 6-cyano-2-iodo-4-(trifluoromethoxy)pyridine-3-carboxylate
5-Amino-4-(difluoromethyl)-3-methoxypyridine-2-sulfonyl chloride
3-Chloro-4-hydroxy-6-(trifluoromethoxy)pyridine-2-sulfonyl chloride