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