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- W3038045400 abstract "Nine new N-methoxy-β-carboline alkaloids (NMCAs) (1a/1b–3a/3b and 4–6) and two known NMCAs (7 and 8) were isolated from the stems of Picrasma quassioides. Their structures were elucidated by spectroscopic data analyses, quantum chemical calculations, and single-crystal X-ray crystallographic data. An analysis of the 13C NMR chemical shifts of the N-methoxy groups in these NMCAs and 41 gathered known compounds reveals the phenomenon that the chemical shifts of all these N-methoxy groups are greater than δC 62, which can be used to recognize the N-methoxy group rapidly. In addition, the acetylcholinesterase (AChE) and Aβ42 aggregation inhibitory activities of 1–8 were evaluated. Compounds 1, 2, 7, and 8 displayed AChE inhibitory activity with IC50 values of 14.9, 13.2, 17.6, and 43.9 μM, respectively. Compound 2 showed inhibition activity against Aβ42 aggregation with an IC50 value of 10.1 μM." @default.
- W3038045400 created "2020-07-02" @default.
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- W3038045400 date "2020-08-01" @default.
- W3038045400 modified "2023-10-05" @default.
- W3038045400 title "N-methoxy-β-carboline alkaloids with inhibitory activities against Aβ42 aggregation and acetylcholinesterase from the stems of Picrasma quassioides" @default.
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- W3038045400 doi "https://doi.org/10.1016/j.bioorg.2020.104043" @default.
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