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