disodium 1-amino-4-(4-amino-2-sulphonatoanilino)-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate

1-Amino-4-[[4-amino-2-[(sodiooxy)sulfonyl]phenyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid sodium salt