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