2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-1H-indole-5-sulfonic acid
CAS No. 605-18-5
2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-1H-indole-5-sulfonic acid;3,3-Dioxo[Δ2,2-biindoline]-5-sulfonic acid;5-Indigosulfonic acid;Indigo sulfonic acid