1-Naphthalenesulfonic acid, 4,5-dihydroxy-, monosodium salt 4,5-Dihydroxynaphthalene-1-sulfonic acid, monosodium salt 54179-01-0 EINECS 259-015-8 Sodium 1,8-dihydroxynaphthate-4-sulfonate Sodium 4,5-dihydroxynaphthalene-1-sulphonate