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