(2,2'-Bi-1H-indole)-3,3'-diol, 5,5',7,7'-tetrabromo-, bis(hydrogen sulfate) (ester), disodium salt 2702-33-2 Disodium 5,5',7,7'-tetrabromo(2,2'-bi-1H-indole)-3,3'-diyl disulphate EINECS 220-287-8