2-11-00-00199 (Beilstein Handbook Reference) 2-Phenanthrenesulfonic acid, 9,10-dihydro-9,10-dioxo- 51789-37-8 9,10-Dihydro-9,10-dioxo-2-phenanthrenesulfonic acid BRN 2989441 Phenanthrenequinone-2-sulfonic acid