4,4'-(Carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis(naphthalene-2,7-disulphonic) acid;4-[4-[[4-[(3,6-disulfo-1-naphthyl)azo]-2-methoxy-5-methyl-phenyl]carbamoylamino]-5-methoxy-2-methyl-phenyl]azonaphthalene-2,7-disulfonic acid
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