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