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