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