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