中文摘要：

从毛萼香茶菜中分得8个二萜，3-乙酰毛萼结晶S、毛萼结晶甲、毛萼结晶乙、毛萼结晶丙、毛萼结晶丁、trichrokattrin、edonicin和eriocalyxin B。其中3-乙酰毛萼结晶S为新的对映-贝壳杉烷型二萜。由波谱法确定其结构。

英文摘要：

New diterpene 3-acetylmacoecrystal S （1） was isolated from Isodon eriocalyx （Dunn） Kudo, together with seven known diterpenes maoecrystals A, B, C and D, trichrokaurin, edonicin, and eriocalyxin B. The structure of 1 was elucidated on the basis of spectral evidence.