英语语法分析

Described herein are compounds that have a spiro structural feature.

本说明书描述了具有螺环结构特征的化合物。

The expected adduct 100 was not stable and appeared to undergo further reaction to the spiro intermediate 101.

由于所期待的加成物（100）不稳定，它经过进一步的反应，就产生螺环中间体。

The spiro compounds containing indole moiety which have significant physiological and biological activity are widely existed a variety of natural products.

含有吲哚结构的螺环骨架广泛存在于各种天然产物中，它具有显著的生理和生物活性。