(-)-.beta.-Bourbonene .beta.-Bourbonene 5208-59-3 Cyclobuta[1,2:3,4]dicyclopentene, 1,2,3,3a,3b.beta.,4,5,6,6a.beta.,6b.alpha.-decahydro-1.alpha.-isopropyl-3a.alpha.-methyl-6-methylene- Cyclobuta[1,2:3,4]dicyclopentene, decahydro-3a-methyl-6-methylene-1-(1-methylethyl)-, [1S-(1.alpha.,3a.alpha.,3b.beta.,6a.beta.,6b.alpha.)]- NSC288727