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