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