Ethyl 2-amino-3-(difluoromethyl)-5-iodopyridine-4-carboxylate
Methyl 5-amino-2-(difluoromethyl)-4-iodopyridine-3-carboxylate
Methyl 4-amino-3-(difluoromethyl)-5-iodopyridine-2-carboxylate
Methyl 4-amino-2-(difluoromethyl)-5-iodopyridine-3-carboxylate