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从旋光数据及脱氧西贝酮的紫外光谱考虑,将西贝素的仲醇羟基定在C-3β-位.为便于解释脱水西贝素异常的化学及光谱性质,认为它具环丙基酮类型的结构,从而西贝素中的羰基应位于C-6.众多的旋光数据对这推断亦无矛盾.对西贝素中叔醇基的位置及其A,B两环的立体化学也有所讨论.西贝素的结构式经推定如(XIV)式.
From the optical data and the UV spectrum of deoxyspergustone, the secondary hydroxyl group of the betaxecins was set at the C-3β-position.In order to explain the chemical and spectroscopic properties of the anhydrustin abnormality, it is believed that it has cyclopropyl ketone Type of structure so that the carbonyl in lieipin should be located at C-6. Many of the data on the optical rotation are also contradictory to this inference. The position of the tertiary alcohol group in lieipin and the stereochemistry of the two rings A and B Discussion The Siebelic structure is presumed as (XIV).