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