1-Naphthol-3,6-disulfonic acid, 8-benzamido-2-[p-[(6-sulfo-2-naphthyl)carbamoyl]phenylazo]-, trisodium salt 2,7-Naphthalenedisulfonic acid, 5-(benzoylamino)-4-hydroxy-3-[[4-[[(6-sulfo-2-naphthalenyl)amino]carbonyl]phenyl]azo]-, trisodium salt NSC45620