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