3-(2,3-Dihydro-2-hydroxy-1,3-dioxo-1H-inden-2-yl)-4,5-dihydroxybenzoic acid 71917-39-0 Acide (hydroxy-2 dioxo-1,3 indan-2)-yl-5 dihydroxy-3,4 benzoique [French] Benzoic acid, 3-(2,3-dihydro-2-hydroxy-1,3-dioxo-1H-inden-2-yl)-4,5-dihydroxy-