Synonyms: 2,7-Naphthalenedisulfonicacid, 4,5-dihydroxy-, disodium salt (8CI,9CI);4,5-Dihydroxynaphthalene-2,7-disulfonicacid disodium salt;Chromotropic acid disodium salt;Disodium1,8-dihydroxynaphthalene-3,6-disulfonate;Disodium4,5-dihydroxynaphthalene-2,7-disulfonate;Disodium chromotropate;Disodiumnaphthalene-1,8-dihydroxy-3,6-disulfonate;Sodium1,8-dioxynaphthalene-3,6-disulfonate;Sodium chromotropate;