4,5-dihydroxynaphthalene-2,7-disulfonic acid, disodium salt; Chromotropic acid disodium salt;Sodium chromotropate;2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-, disodium salt;Disodium chromotropate;Sodium 4,5-dihydroxynaphthalene-2,7-disulfonate;Disodium 4,5-dihydroxynaphthalene-2,7-disulphonate;Mordant Brown 7;Chromotropic acid sodium salt
