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