2-(Difluoromethyl)-5-nitropyridine-4-carboxylic acid
2-(Difluoromethyl)-6-nitro-3-(trifluoromethyl)pyridine
2-(Difluoromethyl)-4-nitropyridine-5-carboxylic acid
2,6-Difluoro-4-(difluoromethyl)pyridine-3-carboxylic acid
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