190517-63-6

3H-INDOLIUM, 2-[5-[1,3-DIHYDRO-3,3-DIMETHYL-5-SULFO-1-(3-SULFOPROPYL)-2H-INDOL-2-YLIDENE]-1,3-PENTADIENYL]-3,3-DIMETHYL-5-SULFO-1-(3-SULFOPROPYL)-, INNER SALT, TRISODIUM SALT