disodium 4-hydroxy-2,7-naphthalenedisulfonate, 1-Naphthol-3,6-Disulphonic Acid Disodium Salt, 1-hydroxy-3,6-naphthalenedisulfonic disodium salt, rudolf guercke acid disodium salt, disodium 4-hydroxynaphthalene-2,7-disulfonate, disodium 1-naphthol-3,6-disulfonic acid, disodium 4-hydroxynaphthalene-2,7-disulphonate, Disodium 4-Hydroxy-2,7-naphthalenedisulfonate Hydrate, 1-Naphthol-3,6-disulfonic acid,disodium salt, 1-Naphthol-3,6-disulfonic acid,disodium salt,hydrate, 1-Naphthol-3,6-disulfonic Acid Disodium Salt Hydrate, 1-Naphthol-3,6-disulfonic acid, RUDOLF GUERCKE ACID DISODIUM SALT HYDRATE, disodium 1-naphthol-3,6-disulfonate, violet acid disodium salt, 4-hydroxy-2,7-naphthalenedisulfonic acid disodium salt, 4-Hydroxy-2,7-naphthalenedisulfonic Acid Disodium Salt Hydrate, sodium 1-naphthol-3,6-disulfonate, DisodiuM 1-Naphthol-3,6-disulfonate Hydrate, Violet Acid Disodium Salt Hydrate