disodium 1-amino-4-[(3-amino-2-methyl-5-sulphonatophenyl)amino]-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate

1-Amino-4-[(3-amino-2-methyl-5-sulfophenyl)amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid disodium salt