Benzoic acid,5-[2-[4′-[2-[8-[2-[2,4-dihydroxy-3-[2-(2-methoxy-5-sulfophenyl)diazenyl]phenyl]diazenyl]-1-hydroxy-3,6-disulfo-2-naphthalenyl]diazenyl]-3,3′-dimethoxy[1,1′-biphenyl]-4-yl]diazenyl]-2-hydr