3-Cyano-4-(difluoromethyl)-2-iodopyridine-5-carboxylic acid
6-(Difluoromethyl)-4-nitro-2-(trifluoromethyl)pyridine-3-sulfonyl chloride
2-(Difluoromethyl)-3-hydroxy-5-nitropyridine-6-sulfonamide
2-Bromo-5-fluoro-6-(trifluoromethoxy)pyridine-3-sulfonamide