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
3-Cyano-6-methoxy-2-(trifluoromethoxy)pyridine-5-acetic acid