![]() ![]() The compounds 1, 3, and 5 were isolated from A. Five alkaloids were isolated, and their structure was elucidated by a combination of 1D and 2D 1H and 13C NMR spectroscopy, HPLC-MS, and high-resolution MS: Lindoldhamine isomer m/ z 569.2674 ( 1), stepharine m/ z 298.1461 ( 2), palmatine m/ z 352.1616 ( 3), 5- N-methylmaytenine m/ z 420.2669 ( 4) and the N- trans-feruloyltyramine m/ z 314.1404 ( 5). In this study, cholinesterase inhibitors were obtained from branches of Abuta panurensis Eichler (Menispermaceae), an endemic species from the Amazonian rainforest. Alkaloids are natural products known as ethnobotanicals that have attracted increasing attention due to a wide range of their pharmacological properties.
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