一、引言我们知道,天然产物化学是有一个范围的,并不能说所有能在大自然找到的物质都叫天然产物。当然,从广义来说,它们也可叫做天然产物,但从化学的角度来说,一般是指在大自然中生物体内存在的或由代谢产生的有机化合物,虽然石油也是天然存在的含碳化合物,但它是在多少亿万年以前由一些动植物埋在地层下变成化石,并在细菌的分解作用下经 I. INTRODUCTION We know that there is a range of natural product chemistry, and it can not be said that all the things that can be found in nature are called natural products. Of course, they are also broadly defined as natural products, but from a chemical point of view they generally refer to organic compounds that exist in or are metabolized by organisms in nature, although oil is also a naturally occurring carbon-containing compound , But how many millions of years ago it was buried under the ground by a few animals and plants into fossils, and under the action of bacterial decomposition