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