3-Bromo-6-(difluoromethyl)-4-nitropyridine-2-sulfonyl chloride
5-Bromo-2-(difluoromethyl)-3-nitropyridine-6-sulfonyl chloride
3-Bromo-4-(difluoromethyl)-2-methoxypyridine-5-carboxylic acid
4-Bromo-5-(difluoromethyl)-2-nitropyridine-3-sulfonyl chloride