4-Hydroxy-6-nitro-3-(trifluoromethoxy)pyridine-2-acetonitrile
4-Hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-5-acetonitrile
5-Hydroxy-3-nitro-4-(trifluoromethoxy)pyridine-2-acetonitrile
3-Hydroxy-5-nitro-2-(trifluoromethoxy)pyridine-4-acetonitrile
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