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