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