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