4-HYDROXYTHIENO[2,3-B]PYRIDINE-5-CARBOXYLIC ACID ETHYL ESTER;ETHYL 4-HYDROXYTHIENO[2,3-B]PYRIDINE-5-CARBOXYLATE;4-Oxo-5[7H]-thieno[2,3-b]pyridine carboxylic acid ethyl ester;Thieno[2,3-b]pyridine-5-carboxylic acid, 4-hydroxy-, ethyl ester
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