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