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