disodium 1-amino-4-[[3-[[(3,6-dichloro-4-pyridazinyl)carbonyl]amino]-2-methyl-5-sulphonatophenyl]amino]-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate

1-Amino-4-[[3-[[(3,6-dichloropyridazin-4-yl)carbonyl]amino]-2-methyl-5-(sodiosulfo)phenyl]amino]-9,10-dihydro-9,10-dioxoanthracene-2-sulfonic acid sodium salt