3-Bromo-6-(difluoromethyl)-4-hydroxypyridine-2-sulfonyl chloride
5-Bromo-2-(difluoromethyl)-3-hydroxypyridine-6-sulfonyl chloride
4-Bromo-5-(difluoromethyl)-2-hydroxypyridine-3-sulfonyl chloride
4-Bromo-5-(difluoromethyl)-3-hydroxypyridine-2-sulfonyl chloride