由于天然产物对人类有利而被使用了几千年,比如用作食物、衣物、化妆品、建造房舍和陷阱、工具和武器,用于竞赛的兴奋剂和捕鱼的毒药、药物或作物保护试剂。在需要某种针对害虫的生理作用的时候,早期的化合物只是简单地从源头提取出来,以非纯品的混合物来使用,其中的一种或几种化合物可 Natural products have been used for thousands of years for their benefit, for example for food, clothing, cosmetics, construction of houses and traps, tools and weapons, stimulants for competitions and poison for fishing, drugs or crop protection agents . When a certain pest-resistant physiological effect is required, the early compounds are simply extracted from the source and used as a mixture of non-pure products, one or several of which may be