5-Chloro-4-(pyridin-3-yl)picolinaldehyde
6-Chloro-2-(pyridin-4-yl)nicotinaldehyde
6-Chloro-5-(pyridin-3-yl)picolinaldehyde
5-Chloro-2-(pyridin-4-yl)isonicotinaldehyde
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