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