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