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