Author's Organization：Faculty of Pharmaceutical Sciences, Science University of Tokyo Faculty of Pharmaceutical Sciences, Science University of Tokyo Tokyo College of Pharmacy Faculty of Pharmaceutical Sciences, University of Tokyo
Two new sesquiterpenoids, caulolactone A (II) and caulolactone B (III) were isolated from A sarum caulescens. It was suggested that they were formed via the conformers I-A and I-B of germacrone-4, 5-epoxide (I) respectively. Moreover, two configurational isomers of germacrone-1, 10 ; 4, 5-diepoxides (IV and V) were derived from I also via I-A and I-B.
