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