3-Bromo-1,7-dimethyl-2-oxobicyclo[2.2.1]heptane-7-methanesulfonic acid Einecs 264-467-4 Nsc 1135 3-Bromo-2-oxobornane-8-sulfonic acid 3-bromo-2-oxobornane-8-sulphonic acid Bicyclo[2.2.1]heptane-7-methanesulfonic acid, 2-bromo-4,7-dimethyl-3-oxo-