2-Bromo-6-(difluoromethyl)-3-hydroxypyridine-5-sulfonyl chloride
2-Bromo-5-(difluoromethyl)-6-hydroxypyridine-3-sulfonyl chloride
Ethyl 2-bromo-5-(difluoromethyl)-4-iodopyridine-3-carboxylate
6-Bromo-3-(difluoromethyl)-4-hydroxypyridine-2-sulfonyl chloride