1,4-Naphthochinon-2-sulfonsaeure, 1,4-dihydro-1,4-dioxo-2-naphthalenesulfonicacipotassiumsalt, 1,4-Dihydro-1,4-dioxonaphthalene-2-sulfonic acid potassium salt, 1,4-naphthoquinone-2-sulfonic acid potassium salt, 1,4-Dioxo-2-naphthalenesulfonic acid potassium salt, 2-Potassium sulfonate-naphthoquinone, potassium 1,4-dihydro-1,4-dioxonaphthalene-2-sulphonate