The first isolation of a trachylobane from an African specimen of Psiadia punctulata (Asteraceae) is presented in this paper. A complete ¹H and ¹³C NMR spectral analysis of this compound and two other trachylobane diterpenes, previously isolated from the same plant, are also provided. The use of NMR techniques such as gCOSY, gHSQC, gHMBC and 2D-J-resolved, in combination with a software-assisted methodology, led to a complete and unequivocal assignment of ¹H and ¹³C signals. This was achieved together with the measurement of all homonuclear hydrogen coupling constants. The presented detail level of the assignment data has never been published before for trachylobanes. Furthermore, with all determined NMR experimental data from the spectra and to obtain a reliability assessment, signals were simulated in the FOMSC3 and NMR_MultSim software.

本文介绍了从Psiadia punctulata（菊科）的非洲标本中首次分离出一种曲叶丹。还提供了该化合物和其他两种以前从同一植物中分离出来的曲叶烷二萜的完整¹ H 和¹³ C NMR 光谱分析。使用 NMR 技术（如g COSY、g HSQC、g HMBC 和 2D - J -resolved）与软件辅助方法相结合，可对¹ H 和^{13进行完整且明确的分配}C 信号。这是与所有同核氢偶联常数的测量一起实现的。之前从未公布过曲叶班的分配数据的详细程度。此外，利用从光谱中确定的所有 NMR 实验数据并获得可靠性评估，在 FOMSC3 和 NMR_MultSim 软件中模拟了信号。