68516-99-4 Cuprate(4-), (4-amino-5-hydroxy-6-((5-(hydroxy-kappaO)-6-((2-(hydroxy-kappaO)-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo-kappaN1)-7-sulfo-2-naphthalenyl)azo)-1,3-naphthalenedisulfonato(6-))-, tetrahydrogen