sodium 4-[(4-amino-9,10-dihydro-3-hydroxy-9,10-dioxo-1-anthryl)amino]toluene-3-sulphonate

2-[[(4-Amino-9,10-dihydro-3-hydroxy-9,10-dioxoanthracen)-1-yl]amino]-5-methylbenzenesulfonic acid sodium salt