Ethyl 2-bromo-5-(bromomethyl)-4-(difluoromethyl)pyridine-3-carboxylate
Ethyl 3-(aminomethyl)-2-bromo-6-(difluoromethyl)pyridine-5-carboxylate
Ethyl 3-(aminomethyl)-2-bromo-5-(difluoromethyl)pyridine-6-carboxylate
Ethyl 2-bromo-5-(bromomethyl)-3-(difluoromethyl)pyridine-4-carboxylate