5-Cyano-2-hydroxy-3-nitro-6-(trifluoromethoxy)pyridine
4-Cyano-3-fluoro-2-nitro-5-(trifluoromethoxy)pyridine
4-Cyano-6-fluoro-3-nitro-2-(trifluoromethoxy)pyridine
4-Cyano-3-hydroxy-6-nitro-2-(trifluoromethoxy)pyridine
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