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