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