1-Amino-4-(3-amino-2,4,6-trimethyl-5-sulfoanilino)-9,10-dihydro-9,10-dioxoanthracene-2-sulfonic acid disodium salt

disodium 1-amino-4-[(3-amino-2,4,6-trimethyl-5-sulphonatophenyl)amino]-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate