Methyl 4-amino-3-(aminomethyl)-5-(difluoromethyl)pyridine-2-carboxylate
3-Amino-4-(aminomethyl)-5-(difluoromethyl)pyridine-2-acetic acid
3-Amino-2-(aminomethyl)-6-(difluoromethyl)pyridine-5-acetic acid
3-Amino-2-(aminomethyl)-4-(difluoromethyl)pyridine-5-acetic acid