Methyl 5-(chloromethyl)-2-cyano-3-(trifluoromethoxy)pyridine-4-acetate
Methyl 4-(chloromethyl)-5-cyano-3-(trifluoromethoxy)pyridine-2-acetate
Methyl 4-(chloromethyl)-3-cyano-2-(trifluoromethoxy)pyridine-5-acetate
2-Cyano-3-(fluoromethyl)-5-(trifluoromethoxy)pyridine-6-acetic acid