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