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