2-Bromo-3-cyano-4-(difluoromethyl)pyridine-5-sulfonyl chloride
3-Bromo-6-cyano-2-(difluoromethyl)pyridine-5-carbonyl chloride
5-Bromo-2-cyano-4-(difluoromethyl)pyridine-3-carbonyl chloride
5-Bromo-2-cyano-3-(difluoromethyl)pyridine-4-carbonyl chloride