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1,4-Bis((sulfo-4-methylphenyl)amino)anthraquinone, sodium salt Benzenesulfonic acid, ((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(methyl-, sodium salt Benzenesulfonic acid, ar,ar'-[(9,10-dihydro-9,10- dioxo-1,4-anthracenediyl)diimino]bis[methyl-, sodium salt Benzenesulfonic acid, 2,2'(or 5,5')-((9,10-dihydro-9,10-dioxo-1,4-anthracenediyl)diimino)bis(5(or 2)-methyl-, sodium salt (1:)