在客观物质世界里,有光学活性的物质一般都有两个对立面,即互成镜像的对映异构体。药理作用的受体学说表明,结构上特异性的药物与生物受体的相互作用如果发生于三个点,则对映异构体会产生不同的生物活性。例如:D-(-)-异丙基肾上腺素作为支气管舒张剂,比L-(+)-体强得多;L-(-)-抗坏血酸有抗坏血活性,但(+)-体无此性质,消炎痛(indo- In the objective material world, optically active substances generally have two opposite, that is, mirror images of each other enantiomers. The pharmacological receptor theory suggests that the interaction of a structurally-specific drug with a biological receptor occurs at three points and the enantiomers produce different biological activities. For example, D - (-) - isoproterenol is a bronchodilator much stronger than L - (+) -; L - This property, indomethacin (indo-