Synonyms: Benzenesulfonic acid, 2,2'-((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(5-methyl-, sodium salt (1:?);4,4'-((9,10-Dihydro-9,10-dioxo-1,4-anthrylene)diimino)bis(toluene-3-sulphonic) acid, sodium salt;Benzenesulfonic acid, 2,2'-((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(5-methyl-, sodium salt;sodium 5-methyl-2-({4-[(4-methyl-2-sulfophenyl)amino]-9,10-dioxo-9,10-dihydroanthracen-1-yl}amino)benzenesulfonate