4,4'-Dihydroxy-3,3'-bis-sulfoazobenzene;Naphthol AS-DO sulfonic acid;Disodium 4,4'-[3-hydroxy-2,4-disulphonaphthylene-1,5-diyl]bis(azo)benzene-2,7-disulphonate
C20H14N2Na2O9S2
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