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4-[(4-Nitrophenyl)azo]-1,2-benzenediol843-33-430 % similar 4-Aminoazobenzene-4′-sulfonic acid104-23-430 % similar Zinc P-toluenesulfonate hydrate123334-05-430 % similar 2,4'-Dihydroxydiphenyl sulfone5397-34-230 % similar Lignin9005-53-230 % similar