5-Cyano-2,3-difluoro-4-(trifluoromethoxy)pyridine
2-Cyano-4,5-dichloro-3-(trifluoromethoxy)pyridine
2-Cyano-4,5-diiodo-3-(trifluoromethoxy)pyridine
4-Cyano-2,3-diiodo-5-(trifluoromethoxy)pyridine
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