Methyl 3-cyano-6-(fluoromethyl)-2-(trifluoromethoxy)pyridine-5-acetate
Methyl 4-cyano-3-(fluoromethyl)-2-(trifluoromethoxy)pyridine-6-acetate
Methyl 4-cyano-2-(fluoromethyl)-3-(trifluoromethoxy)pyridine-6-acetate
Methyl 3-cyano-4-(fluoromethyl)-6-(trifluoromethoxy)pyridine-2-acetate