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