4,5,6,7-Tetrahydro-4-oxo-3-benzofurancarboxylicacid;4-Oxo-4,5,6,7-tetrahydro-1-benzofuran-3-carboxylic acid;4-Oxo-4,5,6,7-tetrahydrobenzofuran-3-carboxylic acid;4-Oxo-4,5,6,7-tetrahydrocoumarone-3-carboxylic acid;
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