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