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