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