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