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