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