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