Synonyms: Benzenesulfonic acid, 3(or 4)-((6,7-dichloro-4-((2,6-dimethylsulfophenyl)amino)-9,10-dihydro-9,10-dioxo-1-anthracenyl)amino)-2,4(or 3,5)-dimethyl-, sodium salt (1:2);Benzenesulfonic acid, 3(or 4)-((6,7-dichloro-4-((2,6-dimethylsulfophenyl)amino)-9,10-dihydro-9,10-dioxo-1-anthracenyl)amino)-2,4(or 3,5)-dimethyl-, disodium salt;Disodium 3(or 4)-((6,7-dichloro-4-((2,6-dimethylsulphonatophenyl)amino)-9,10-dihydro-9,10-dioxo-1-anthryl)amino)-2,4(or 3,5)-dimethylbenzenesulphonate;disodium 3,3'-[(6,7-dichloro-9,10-dioxo-9,10-dihydroanthracene-1,4-diyl)diimino]bis(2,4-dimethylbenzenesulfonate)