Investigation of the alkaloids from leads to the isolation of myrionsumamide A (1), a pair of enantiomeric alkaloids with an unprecedented tetracyclic system skeleton. These two alkaloids were separated by chiral HPLC with a ratio of 3 : 5 from the scalemic mixture. Their structures including absolute configurations were determined by NMR spectroscopy, X-ray diffraction data and ECD calculations. Both (+)-1 and (-)-1 showed antibacterial activity against with MIC at 7.81 μg ml.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9527643 | PMC |
http://dx.doi.org/10.1039/d2ra05342j | DOI Listing |
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