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1·Research advance on non ester pyrethroids was reviewed. Its structural feature, biological activity, research present situation, stereo isomer and resistance were described.

论述了非酯型拟除虫菊酯的研究进展，介绍了其结构特点、生物活性、研究现状、立体异构及抗性方面的内容。

2·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。