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