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