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4-Ethylbenzenesulfonic acid98-69-130 % similar Ferron547-91-130 % similar 4-Chloro-3-nitrobenzenesulfonic acid121-18-630 % similar 2-Naphthol-3,6-disulfonic acid disodium salt135-51-330 % similar 8-Hydroxyquinoline sulfate monohydrate207386-91-230 % similar 2-Aminobenzene-1,4-sulfonic acid monosodium salt24605-36-530 % similar 2-Chloro-5-nitrobenzenesulfonic acid96-73-130 % similar