Ethyl 6-bromo-4-(difluoromethyl)-2-hydroxypyridine-3-carboxylate
Ethyl 6-bromo-4-(difluoromethyl)-3-hydroxypyridine-2-carboxylate
Ethyl 2-bromo-4-(difluoromethyl)-3-hydroxypyridine-6-carboxylate
Ethyl 2-bromo-3-(difluoromethyl)-6-hydroxypyridine-5-carboxylate