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