Cuprate(4-), [2-[2-[[2-[3-[[4-chloro-6-[[4-[(2,3-dibromo-1-oxopropyl)amino]-2-sulfophenyl]amino]-1,3,5-triazin-2-yl]amino]-2-(hydroxy-κO)-5-sulfophenyl]diazenyl-κN2]phenylmethyl]diazenyl-κN1]-4-sulfobenzoato(6-)-κO]-, sodium