in a way where the result of a chemical reaction is controlled by the position of the atoms within the molecules (= a unit of a chemical substance made of a group of two or more atoms) involved in the reaction

A series of stereospecifically labelled polyunsaturated fatty acids was prepared by biosynthesis. 一系列立体特异性标记的多不饱和脂肪酸通过生物合成法制备。

The reactions take place stereospecifically in most cases, regardless of the type of reagent used.