4-Bromo-3-nitro-2-(trifluoromethoxy)pyridine-5-carbonyl chloride
4-Bromo-2-nitro-6-(trifluoromethoxy)pyridine-3-carbonyl chloride
5-Chloro-4-cyano-3-(trifluoromethoxy)pyridine-2-carbonyl chloride
3-Chloro-2-cyano-6-(trifluoromethoxy)pyridine-5-carbonyl chloride