Methyl 5-amino-4-(difluoromethyl)-2-iodopyridine-3-carboxylate
Methyl 3-amino-4-(difluoromethyl)-5-iodopyridine-2-carboxylate
Methyl 3-amino-2-(difluoromethyl)-6-iodopyridine-5-carboxylate
Methyl 3-amino-2-(difluoromethyl)-5-iodopyridine-4-carboxylate