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