Synonyms: 1H-Indene-2-carboxylic acid, 2,3-dihydro-1,3-dioxo-, ethyl ester, ion(1-), sodium (1:1);Ethyl 1,3-diketohydrindene-2-carboxylate, sodium salt;1H-Indene-2-carboxylic acid, 2,3-dihydro-1,3-dioxo-, ethyl ester, ion(1-), sodium;Ethyl 2,3-dihydro-1,3-dioxo-1H-indene-2-carboxylate, sodium salt;sodium (1,3-dioxo-1,3-dihydro-2H-inden-2-ylidene)(ethoxy)methanolate