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