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