The basic structural units in both tannins are of 2, 3-cis-configuration.
两种单宁分子的组成单元大部分具有2，3-顺式构型。
The procyanidin is primarily consisted of units with 2,3-cis configuration.
多聚原花青定的组成单元以2，3-顺式构型为主。
The double bonds are usually in the cis configuration, which introduce a sharp kink.
那些双键一般是顺式结构的，从而引进一个大幅度的扭转。
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