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