2-Naphthalenesulfonic acid, 1,4-dihydro-1,4-dioxo-, potassium salt 34169-62-5 5690-16-4 EINECS 251-861-6 NSC 26698 Potassium 1,4-dihydro-1,4-dioxonaphthalene-2-sulphonate Potassium 1,4-naphthoquinone-2-sulfonate