For the reason why optical activity of mesomer is counteracted classical answer was not convincing.

指出了内消旋体消旋原因传统解释的不合理性。

The tetramisole molecular have optical activity.The traditional method is time and cost consuming to decide the rotatory direction and the value of optical rotatory.

四咪唑分子具有光学活性，为了确定旋光度的大小和方向，使用传统方法既耗时又不经济。

For the reason why optical activity of mesomer is counteracted classical answer was not convincing. By use of the helix theory and stable staggered conformation answer can be obtained.

指出了内消旋体消旋原因传统解释的不合理性。利用螺旋理论和稳定的交叉式构象，合理地解释了内消旋体消旋的原因。