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