3-Bromo-4-(difluoromethyl)-5-nitropyridine-2-sulfonyl chloride
3-Bromo-4-(difluoromethyl)-2-nitropyridine-5-sulfonyl chloride
5-Bromo-2-(chloromethyl)-3-(difluoromethyl)pyridine-6-acetic acid
4-Bromo-5-(chloromethyl)-2-(difluoromethyl)pyridine-3-acetic acid