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