6-Bromo-4-nitro-2-(trifluoromethoxy)pyridine-3-sulfonyl chloride
4-Bromo-3-methyl-6-(trifluoromethoxy)pyridine-2-sulfonyl chloride
2-Bromo-4-nitro-5-(trifluoromethoxy)pyridine-3-sulfonyl chloride
5-Chloro-4-cyano-2-(trifluoromethoxy)pyridine-3-acetic acid