Copper, 5-[[4'-[[8-[[2,4-dihydroxy-3-[(2-methoxy-5-sulfophenyl)azo]phenyl]azo]-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoate sodium complexes