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