2,2'-(9,10-Dihydro-5,8-dihydroxy-9,10-dioxo-1,4-anthracenediyl)diiminobis(5-butylbenzenesulfonic acid), disodium salt 70865-37-1 73398-33-1 Benzenesulfonic acid, 2,2'-((9,10-dihydro-5,8-dihydroxy-9,10-dioxo-1,4-anthracenediyl)diimino)bis(5-butyl-, disodium salt