2-Methyl-7-oxo-7H-dibenz[f,ij]isoquinoline-4-sulfonic acid

2-methyl-7-oxo-7H-dibenz[f,ij]isoquinoline-4-sulphonic acid

7H-Naphtho[1,2,3-de]quinoline-4-sulfonic acid, 2-methyl-7-oxo-