C.I. Acid red 82

disodium 4-[(2,7-dihydro-3-methyl-2,7-dioxo-3H-dibenz[f,ij]isoquinolin-6-yl)amino]-benzene-1,3-disulphonate

4-[(2,7-Dihydro-3-methyl-2,7-dioxo-3H-dibenz[f,ij]isoqinoling-6-yl)amino]-1,3-benzenedisulfonic acid diodium salt