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

1-Amino-4-[[4-chloro-3-(sodiooxysulfonyl)phenyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid sodium salt