Methyl 3-(bromomethyl)-4-cyano-2-(difluoromethyl)pyridine-6-acetate
2-(Chloromethyl)-3-cyano-6-(difluoromethyl)pyridine-4-acetic acid
Methyl 4-cyano-3-(difluoromethyl)-5-methylpyridine-2-acetate
3-(Chloromethyl)-6-cyano-2-(difluoromethyl)pyridine-5-acetic acid