9,10-Dihydro-1,5-dihydroxy-9,10-dioxo-4,8-bis[(sulfomethyl)amino]-2,6-anthracenedisulfonic acid

9,10-dihydro-1,5-dihydroxy-9,10-dioxo-4,8-bis[(sulphomethyl)amino]anthracene-2,6-disulphonic acid