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