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