25394-13-2 4,4'-Diaminostilbene-2,2'-disulfonic acid, sodium salt 81-11-8 Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis(5-amino-, sodium salt EINECS 246-937-0 Sodium 4,4'-diaminostilbene-2,2'-disulphonate