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