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