2-(Difluoromethyl)-5-fluoro-3-iodopyridine-4-sulfonyl chloride
2-(Difluoromethyl)-5-hydroxy-4-iodopyridine-3-sulfonyl chloride
6-(Difluoromethyl)-2-hydroxy-4-iodopyridine-3-sulfonyl chloride
4-(Difluoromethyl)-2-fluoro-3-nitropyridine-5-sulfonyl chloride