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