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