Synonyms: BRN 1609636;4-(1,4-Dihydro-6-hydroxy-2,7-dimethoxy-1,4-dioxo-9H-carbazol-9-yl)benzenesulfonic acid;Benzenesulfonic acid, 4-(1,4-dihydro-6-hydroxy-2,7-dimethoxy-1,4-dioxo-9H-carbazol-9-yl)-;AC1MI89Z;LS-31865;4-(6-hydroxy-2,7-dimethoxy-1,4-dioxocarbazol-9-yl)benzenesulfonic acid;51620-26-9