Cuprate(4-), [mu3-[7-[[6-[[4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-3,3-dihydroxy[1,1-biphenyl]-4-yl]azo]-1,5-dihydroxy-7-sulfo-2-naphthalenyl]azo]-8-hydroxy-1,3,6-naphthalenetrisulfonato(10-)]]tri-, tetrasodium