prov:value
| - wherein A, B, C and D are, independently of one another, an aromatic six-membered ring, M is a hydrogen atom, alkali metal, ammonium or organic ammonium, E is an alkylene group, X is a sulfo-substituted anilino group, carboxyl-substituted anilino group or phosphono-substituted anilino group, with the proviso that such a substituted anilino group may further have 1 to 4 substituents selected from t
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