potassium 1,2-naphthoquinone-4-sulphonate, 3,4-Dioxo-3,4-dihydronaphthalene-1-sulfonic acid potassium salt, 1,2-NAPHTHOQUINONE-4-SULFONIC ACID POTASSIUM SALT TECH, 3,4-Dihydro-3,4-dioxo-1-naphthalenesulfonic acid potassium salt, B-Naphthoquinone-4-sulfonic acid potassium salt, 1,2-NAPHTHOQUINONE-4-SULFONIC ACID POTASSIUM SALT