sodium 4-[(4-amino-9,10-dihydro-3-methyl-9,10-dioxo-1-anthryl)amino]toluene-2-sulphonate

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