Dihydrogen (4-hydroxy-3-((2-hydroxy-4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)naphthalene-1-sulphonato(4-))cuprate(2-);copper(2+) 2-[(E)-(2-oxido-4-{[2-(sulfooxy)ethyl]sulfonyl}phenyl)diazenyl]-4-sulfonaphthalen-1-olate
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