Ethyl 4-(bromomethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine-5-acetate
Ethyl 5-(bromomethyl)-3-hydroxy-4-(trifluoromethoxy)pyridine-2-acetate
Ethyl 4-hydroxy-2-methyl-6-(trifluoromethoxy)pyridine-3-acetate
Ethyl 2-(fluoromethyl)-4-hydroxy-5-(trifluoromethoxy)pyridine-3-carboxylate