Synonyms: 1,4-Bis(4-methyl-2-sulfophenylamino)anthraquinone;2,2'-(9,10-Dihydro-9,10-dioxo-1,4-anthracenediylbisimino)bis(5-methylbenzenesulfonic acid);2,2'-[(9,10-Dihydro-9,10-dioxo-1,4-anthracenediyl)diimino]bis[5-methylbenzenesulfonic acid];2,2'-[[(9,10-Dihydro-9,10-dioxoanthracene)-1,4-diyl]diimino]bis[5-methylbenzenesulfonic acid]