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