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