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