1,2-Naphthoquinone-4-sulfonate 1-Naphthalenesulfonic acid, 3,4-dihydro-3,4-dioxo- 2066-93-5 3,4-Dihydro-3,4-dioxonaphthalene-1-sulphonic acid 38821-95-3 521-24-4 AI3-52480 EINECS 218-184-8