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