4-[[4-[(4-amino-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-2,7-disulphonic acid, sodium salt;2,7-Naphthalenedisulfonic acid, 4-[[4-[(4-amino-1-naphthalenyl) azo]-1-naphthalenyl]azo]-, sodium salt;Einecs 282-157-7
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