7-hydroxy-8-[(4-sulphonaphthyl)azo]naphthalene-1,3-disulphonic acid;EINECS 230-648-1;2-Hydroxy-(1,1'-azobisnaphthalene)-4',6,8-trisulfonic acid;6-Hydroxy-5-(4-sulfo-1-naphtylazo)-2,4-naphthalenedisulfonic acid
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