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