2-Bromo-6-(difluoromethyl)-3-nitropyridine-4-carboxylic acid
6-Bromo-3-(difluoromethyl)-2-nitropyridine-4-carboxylic acid
2-Bromo-5-(difluoromethyl)-4-nitropyridine-3-carboxylic acid
3-Bromo-4-(difluoromethyl)-6-(trifluoromethyl)pyridine-2-carboxylic acid