4,4'-[Methylenebis[(3,5-dimethyl-4,1-phenylene)imino]]bis(1-amino-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid)

4,4'-[methylenebis[(3,5-dimethyl-4,1-phenylene)imino]]bis[1-amino-9,10-dihydro-9,10-dioxoanthracene-2-sulphonic acid]