Graucin A, a newbitterlimonoid, has been isolated from the root bark of Evodia grauca Miq. as well as the known limonoids limonin, rutaevin and limonin diosphenol. Its structural and stereochemical assignments were made using NMR (COSY and NOESY), and CD spectroscopy, which indicated the uncommon 5β-H configuration of this new compound. Rutaevin was also recognized to be a 5β-H limonoid.
Graucin A 是一种新的苦柠檬甙,已从 Evodia grauca Miq 的根皮中分离出来。以及已知的柠檬苦素类柠檬苦素、芸香甙和柠檬苦素二酚。其结构和立体化学分配是使用 NMR(COSY 和 NOESY)和 CD 光谱进行的,这表明这种新化合物具有不常见的 5β-H 构型。Rutaevin 也被认为是一种 5β-H 柠檬苦素。