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