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