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