Synonyms: 2,2'-((9,10-Dihydro-9,10-dioxo-1,4-anthrylene)diimino)bis(5-butylbenzenesulphonic) acid;2,2'-[(9,10-dioxo-9,10-dihydroanthracene-1,4-diyl)diimino]bis(4-butylbenzenesulfonic acid);2,2'-[(9,10-dioxo-9,10-dihydroanthracene-1,4-diyl)diimino]bis(5-butylbenzenesulfonic acid)