Ethyl 3-cyano-2-(trifluoromethoxy)-6-(trifluoromethyl)pyridine-4-carboxylate
Ethyl 3-cyano-2-(trifluoromethoxy)-4-(trifluoromethyl)pyridine-6-carboxylate
Ethyl 2-cyano-6-(trifluoromethoxy)-5-(trifluoromethyl)pyridine-3-carboxylate
Ethyl 2-cyano-5-(trifluoromethoxy)-3-(trifluoromethyl)pyridine-6-carboxylate