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