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