Investigation of an extract of Iphiona aucheri afforded compounds 1–3. These compounds were identified by detailed spectroscopic and spectrometric analysis, however, a literature search revealed that NMR and mass data similar to those of compound 3 have been reported for donine alkaloid 4. Investigation of the experimental and calculated NMR data of compound 4 revealed that the proposed structure should be revised to 3. This was further confirmed by synthesis of compounds 3 and 4.

中文翻译：

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Iphiona aucheri 的植物化学研究。多宁结构调整

对 Iphiona aucheri 提取物的研究得到了化合物 1-3。这些化合物通过详细的光谱和光谱分析进行了鉴定，然而，文献检索显示，已经报道了与化合物 3 相似的多宁生物碱 4 的 NMR 和质量数据。 对化合物 4 的实验和计算 NMR 数据的研究表明，建议的结构应修改为 3。 化合物 3 和 4 的合成进一步证实了这一点。