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