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