4-Chloro-2-(fluoromethyl)-5-nitro-3-(trifluoromethoxy)pyridine
3-Bromo-5-nitro-2-(trifluoromethoxy)pyridine-6-sulfonyl chloride
5-Chloro-3-(fluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine
3-Bromo-4-nitro-6-(trifluoromethoxy)pyridine-2-sulfonyl chloride