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