4-Amino-3-((2,5-disulphophenyl)azo)-5-hydroxy-6-((3-phosphonophenyl)azo)naphthalene-2,7-disulphonic acid;(3E)-5-amino-6-[(E)-(2,5-disulfophenyl)diazenyl]-4-oxo-3-[(3-phosphonophenyl)hydrazono]-3,4-dihydronaphthalene-2,7-disulfonic acid
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