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