Methyl 4-hydroxy-6-(trifluoromethyl)thieno-[3,4-b]-pyridine-1-carboxylatemethyl 4-hydroxy-2-(trifluoromethyl)thieno[3,4-b]pyridine-7-carboxylateMethyl 4-hydroxy-6-(trifluoromethyl)thieno[3,4-b]pyridine-1-carboxylate 97%Methyl 4-hydroxy-2-(trifluoromethyl)thieno[3,4-b]pyridine-7-carboxylate