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