2,7-Naphthalenedisulfonicacid, 3,6-dihydroxy-, disodium salt (8CI,9CI);2,7-Dihydroxy-3,6-naphthalenesulfonatedisodium salt;Coupler 518;Coupler O;Disodium2,7-Dihydroxynaphthalene-3,6-disulfonate;
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