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