Abstract A new bitter limonoid, glaucin B, has been isolated from the root bark of Evodia glauca together with the known limonoids limonin, rutaevin, limonin diosphenol and glaucin A (12α-hydroxyrutaevin). The structure of glaucin B determined to have the uncommon 5β-H configuration by spectral and chemical evidence.

中文翻译：

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Glaucin B，一种来自 Evodia glauca 的新苦柠檬苦素

摘要 从吴茱萸根皮中分离得到了一种新的苦柠檬苦素类物质，即青蒿素B，以及已知的苦柠檬素类柠檬苦素、芸香甙、柠檬苦甙二酚和青蒿素A（12α-羟基芸香甙）。通过光谱和化学证据确定 glaucin B 的结构具有罕见的 5β-H 构型。