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