One of the kayanol milling ultra sky SE

disodium 3,3'-[(9,10-dihydro-9,10-dioxo-1,4-anthrylene)bis[imino(3-methylpropane-1,3-diyl)]]bis(benzenesulphonate)

3,3'-[[(9,10-Dihydro-9,10-dioxoanthracene)-1,4-diyl]bis[imino(3-methyl-3,1-propanediyl)]]bis(benzenesulfonic acid sodium) salt