Synonyms: Benzenesulfonic acid, 3,3'-((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(2(or 4)-bromo-6-butyl-4(or 2)-methyl-, disodium salt (1:2);Benzenesulfonic acid, 3,3'-((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(2(or 4)-bromo-6-butyl-4(or 2)-methyl-, disodium salt;Disodium 2,2'(or 6,6')-((9,10-dihydro-9,10-dioxo-1,4-anthrylene)diimino)bis(3(or 5)-bromo-5(or 2)-butyltoluene-4(or 2)-sulphonate)