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