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