2-((4-Chloro-9,10-dihydro-5,8-dihydroxy-9,10-dioxo-1-anthracenyl)amino)-5-methylbenzenesulfonic acid sodium salt 69657-96-1 Benzenesulfonic acid, 2-((4-chloro-9,10-dihydro-5,8-dihydroxy-9,10-dioxo-1-anthracenyl)amino)-5-methyl-, sodium salt