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.

罗匹尼罗是种类似多巴胺的多巴胺，多巴胺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多巴胺D2受体有较高的结合力。