3-Amino-2-(bromomethyl)-4-(difluoromethyl)pyridine-6-acetonitrile
2-Amino-5-(chloromethyl)-4-(difluoromethyl)pyridine-3-acetic acid
5-Amino-4-(bromomethyl)-3-(difluoromethyl)pyridine-2-methanol
6-Amino-4-(chloromethyl)-2-(difluoromethyl)pyridine-3-acetic acid