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