3,6-Bis(4-antipyrylazo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid disodium salt;(3E,6E)-3,6-bis[(1,5-dimethyl-3-oxo-2-phenylpyrazol-4-yl)hydrazinylidene]-4,5-dioxonaphthalene-2,7-disulfonic acid;
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