3-Amino-6-(chloromethyl)-4-(difluoromethyl)pyridine-2-carboxaldehyde
4-Amino-5-(bromomethyl)-3-(difluoromethyl)pyridine-2-acetic acid
5-Amino-4-(chloromethyl)-3-(difluoromethyl)pyridine-2-carboxaldehyde
4-Amino-2-(bromomethyl)-3-(difluoromethyl)pyridine-5-acetic acid