6471-17-6 Benzoic acid, 3,3'-(thiobis(4,1-phenyleneazo))bis(6-hydroxy-, disodium salt Disodium 5,5'-(thiobis(p-phenyleneazo))disalicylate EINECS 229-310-6 Thiodiphenyl-4,4'-diazobissalicylic acid, disodium salt