Ethyl 4-fluoro-3-methoxy-2-(trifluoromethoxy)pyridine-5-acetate
Ethyl 4-fluoro-2-methoxy-3-(trifluoromethoxy)pyridine-5-acetate
Ethyl 3-fluoro-5-methoxy-2-(trifluoromethoxy)pyridine-4-acetate
Ethyl 3-fluoro-2-methoxy-4-(trifluoromethoxy)pyridine-5-acetate