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