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