Ropinirole,a dopamine agonist,has similar effect of dopamine but without ergoline structure by which its stronger binding power with dopamine D2 receptor may be explained.

罗匹尼罗是一种类似的动剂，第一动剂不同的是没有麦角林结构。罗匹尼罗的非麦角林结构可以说明其D2受体有较高的结合力。