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