1H-Indene-1-carboxylic acid, 2,3-dihydro-3-oxo- 2,3-Dihydro-3-oxo-1H-indene-1-carboxylic acid 29427-69-8 3-Oxo-2,3-dihydro-1H-indene-1-carboxylic acid 4-10-00-02853 (Beilstein Handbook Reference) BRN 2098797