Synonyms: 2,7-Naphthalenedisulfonicacid, 3-hydroxy-4-nitroso-, disodium salt (7CI,8CI,9CI);1-Nitroso-3,6-disulfo-2-naphthol disodium salt;Disodium1-nitroso-2-naphthol-3,6-disulfate;Disodium3-hydroxy-4-nitrosonaphthalene-2,7-disulfonate;Nitroso R;Nitroso red salt;Nitroso-R salt;