2,3,5-Trifluoro-6-(pyridin-4-yl)pyridine
2,3,5-Trifluoro-6-(pyridin-3-yl)pyridine
2,3,5,6-Tetrafluoro-4-(pyridin-4-yl)pyridine
2,3,5,6-Tetrafluoro-4-(pyridin-3-yl)pyridine
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