16389-59-6 Cuprate(4-), (4-amino-5-(hydroxy-kappaO)-3-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-6-((2-(hydroxy-kappaO)-5-sulfophenyl)azo-kappaN1)-2,7-naphthalenedisulfonato(6-))-, tetrahydrogen