ammonium (1S-endo)-[3-bromo-7,7-dimethyl-2-oxobicyclo[2.2.1]hept-1-yl]methanesulphonate

(1S,4S)-3β-Bromo-7,7-dimethyl-2-oxobicyclo[2.2.1]heptane-1-methanesulfonic acid ammonium salt