4-Cyano-3-nitro-2-(trifluoromethoxy)pyridine-5-carbonyl chloride
4-Cyano-2-nitro-6-(trifluoromethoxy)pyridine-3-carbonyl chloride
4-Cyano-2-nitro-5-(trifluoromethoxy)pyridine-3-carbonyl chloride
4-Cyano-2-nitro-3-(trifluoromethoxy)pyridine-5-carbonyl chloride