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