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