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