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