1-amino-4-[3-[[2-(diethylamino)ethyl]sulphonyl]anilino]-9,10-dihydro-9,10-dioxoanthracene-2-sulphonic acid, sodium salt

1-Amino-4-[[3-[[2-(diethylamino)ethyl]sulfonyl]phenyl]amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid/sodium,(1:x) salt