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