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