Mannitol and sorbitol is a pair of isomer, when mannitol was produced by chemical synthesis, it is ineluctability that there is some part of mannitol retained in the byproduct liquid of sorbitol.

甘露醇和山梨醇是一对同分异构体，在化学合成法生产甘露醇时，所产生的山梨醇母液，不可避免的含有部分甘露醇。

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The raceme, the (R)-isomer and the (S)-isomer are identical in chemical structural formula but different in stereostructure and optical rotation performance.

外消旋体、（R）-异构体和（S）-异构体具有相同的化学结构式，具有不同的立体结构和旋光性能。

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