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