dipotassium 1,5-dihydroxy-9,10-dihydro-4,8-dinitro-9,10-dioxoanthracene-2,6-disulphonate

1,5-Dihydroxy-9,10-dihydro-4,8-dinitro-9,10-dioxo-2,6-anthracenedisulfonic acid dipotassium salt