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