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