7,7-Dimethylbicyclo(2.2.1)heptane-2,3-dione-1-methanesulfonic acid 73413-79-3 Bicyclo(2.2.1)heptane-1-methanesulfonic acid, 7,7-dimethyl-2,3-dioxo-, (1S)- Camphorquinone-10-sulfonic acid