Ethyl 3-amino-6-(aminomethyl)-2-(difluoromethyl)pyridine-4-acetate
Ethyl 5-amino-2-(aminomethyl)-4-(difluoromethyl)pyridine-3-acetate
Ethyl 3-amino-6-(difluoromethyl)-2-methylpyridine-5-acetate
2-Amino-4-(bromomethyl)-3-(difluoromethyl)pyridine-6-methanol