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