2-Anthracenesulfonic acid, 4-((3-(acetylamino)-4-methylphenyl)amino)-1-amino-9,10-dihydro-9,10-dioxo- 4-((3-(Acetylamino)-4-methylphenyl)amino)-1-amino-9,10-dihydro-9,10-dioxoanthracene-2-sulphonic acid 73309-50-9 EINECS 277-377-5