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