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