Methyl 2-amino-4-(difluoromethyl)-3-nitropyridine-6-carboxylate
Methyl 3-amino-4-(difluoromethyl)-2-nitropyridine-5-carboxylate
Methyl 2-amino-3-(difluoromethyl)-6-nitropyridine-4-carboxylate
Methyl 2-amino-5-(bromomethyl)-4-(difluoromethyl)pyridine-3-acetate