4-Fluoro-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
5-(Difluoromethyl)-3-nitro-2-(trifluoromethyl)pyridine-4-sulfonyl chloride
3-(Difluoromethyl)-5-fluoro-2-nitropyridine-4-carbonyl chloride
3-Chloro-2-(difluoromethyl)-6-fluoropyridine-4-carbonyl chloride