Chemistry of zerumbone. 1. Simplified isolation, conjugate addition reactions, and a unique ring contracting transannular reaction of its dibromide - Kitayama,T.; Okamoto,T.; Hill,R.K.; Kawai,Y.; Takahashi,S.; Yonemori,S.; Yamamoto,Y.; Ohe,K.; Uemura,S.; Sawada,S. (J Org Chem, 1999)