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