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