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