Spiro[1,3-dioxolane-2,2'(1'H)-[1,4]ethanonaphthalene]-9',10'-dicarboxylicacid (8CI,9CI); 1,4-Ethanonaphthalene-2,3-dicarboxylic acid,1,2,3,4-tetrahydro-9-oxo-, cyclic 1,2-ethanediyl acetal
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