A new tetracyclic triterpenoid (1) was isolated from the fresh bark of Ailanthus altissima. The structure was elucidated on the basis of spectroscopic analysis including 1D and 2D NMR techniques and high-resolution mass spectrometry.

中文翻译：

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臭椿新鲜树皮中一种新的四环三萜类化合物

从臭椿的新鲜树皮中分离出一种新的四环三萜类化合物(1)。该结构是在光谱分析的基础上阐明的，包括一维和二维核磁共振技术和高分辨率质谱。