5401-44-5 62609-87-4 Benzenesulfonic acid, 3,3'-(3-oxo-1(3H)-isobenzofuranylidene)bis(6-hydroxy-, trisodium salt EINECS 263-634-9 Trisodium alpha-(4-hydroxy-3-sulphonatophenyl)-alpha-(4-oxo-3-sulphonatocyclohexa-2,5-dienylidene)-alpha-toluate