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