Abstract
AbstractTwo new alkaloids, named tuberostemoninol A (1) and tuberostemoninol B (2), along with the known compounds tuberostemoninol (3) and bisdehydroneotuberostemonine (4), were isolated from Stemona tuberosa Lour. The structures were elucidated by means of spectroscopic analyses, including 1D‐ and 2D‐NMR experiments. The four alkaloids 1–4 were analyzed by on‐line high‐performance liquid chromatography/electrospray‐ionization mass spectrometry (HPLC/ESI‐MS), and their fragmentation pathways were found to be similar. Compounds 1, 2, and 3 are isomers with the same molecular mass but which eluted at different retention times.
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