1-Amino-4-[m-(2-hydroxyethylsulfonyl)anilino]-9,10-dihydro-9,10-dioxoanthracene-2-sulfonic acid

1-Amino-4-[3-(2-hydroxyethylsulfonyl)phenylamino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid