.beta.-Pinone 2-Norpinanone, 6,6-dimethyl- 24903-95-5 6,6-Dimethylbicyclo[3.1.1]heptan-2-one Bicyclo[3.1.1]heptan-2-one, 6,6-dimethyl- NSC135004 Nopinon Nopinone