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