159092-33-8 1H-Indene-2-carboxylic acid, 2,3-dihydro-1,3-dioxo-, ethyl ester, ion(1-), sodium 49583-83-7 65735-88-8 81419-54-7 89272-22-0 93393-44-3 EINECS 256-389-4 Ethyl 1,3-diketohydrindene-2-carboxylate, sodium salt Ethyl 2,3-dihydro-1,3-dioxo-1H-indene-2-carboxylate, sodium salt