Ethyl 4-hydroxy-5-methoxy-2-(trifluoromethoxy)pyridine-3-carboxylate
Methyl 4-hydroxy-3-methoxy-2-(trifluoromethoxy)pyridine-5-carboxylate
Ethyl 4-hydroxy-3-methoxy-5-(trifluoromethoxy)pyridine-2-carboxylate
Methyl 4-hydroxy-6-methoxy-3-(trifluoromethoxy)pyridine-2-carboxylate