Ethyl 2-fluoro-4-(trifluoromethoxy)pyridine-6-carboxylate
Methyl 6-(fluoromethyl)-4-methyl-3-(trifluoromethoxy)pyridine-2-carboxylate
Methyl 2-(fluoromethyl)-4-methyl-3-(trifluoromethoxy)pyridine-5-carboxylate
Methyl 2-(fluoromethyl)-3-methyl-4-(trifluoromethoxy)pyridine-5-carboxylate