Ethyl 2-bromo-6-(bromomethyl)-5-(difluoromethyl)pyridine-3-acetate
Ethyl 2-bromo-6-(bromomethyl)-4-(difluoromethyl)pyridine-3-acetate
4-Chloro-5-(difluoromethyl)-2-fluoropyridine-3-acetic acid
4-Chloro-5-(difluoromethyl)-3-fluoropyridine-2-acetic acid