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