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从螺旋理论观点看［１，２］，大多数无光学活性的有机化合物都是内、外消旋体，或者是内、外消旋体的混合物，都属于构象内或构象间螺旋旋光度代数和为零的一类化合物．少数无光学活性的平面和直线型分子，可以认为前者包含的螺旋，其螺距为零；后者包含的螺旋，其螺距等于螺旋线的长度（即螺旋的半径为零）．根据螺旋模型的计算，这两种特殊螺旋，其族光度应为零［３］．可见，螺旋理论也适用于无光学活性的化合物．
From the perspective of the theory of helix [1, 2], most of the non-optically active organic compounds are internal racemates, or mixtures of internal and racemic racemates, all within the conformational or conformational spiral rotation degree algebra And a class of compounds that are zero. A small number of non-optically active planar and linear molecules can be thought of as the former containing helices with zero pitch; the latter contains helices whose pitch is equal to the length of the helix (ie, the radius of the helix is zero). According to the calculation of the helical model, the two special helices whose family luminances should be zero [3]. It can be seen that the theory of helix also applies to compounds that have no optical activity.