ChEBI: A naphthalenesulfonic acid that is 7-hydroxynaphthalene-1,3-disulfonic acid substituted at position 8 by a [4-(phenyldiazenyl)phenyl]diazenyl group. The disodium salt is the biological stain 'woodstain scarlet'.
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![7-hydroxy-8-[[4-(phenylazo)phenyl]azo]naphthalene-1,3-disulphonic acid Structure](/CAS/GIF/25317-39-9.gif)