Two new sterol derivatives isolated from the endophytic fungus Aspergillus tubingensis YP-2
Natural Product Research(2019)
摘要
Two new sterol derivatives, namely ergosterimide B (1) and demethylincisterol A5 (2), along with eleven known metabolites (3–13), were isolated from the rice fermentation culture of Aspergillus tubingensis YP-2. The chemical structures were elucidated by detailed NMR and MS spectroscopic data and by comparison with reported data. Newly isolated compound 2 and known compound 3 were evaluated for their cytotoxicities against the A549 and HepG2 cell lines. Compound 2 showed weak activities with IC50 values of 11.05 and 19.15 μM, respectively, while 3 exhibited cytotoxicities with IC50 values of 5.34 and 12.03 μM, respectively, against the tested cell lines.
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关键词
Aspergillus tubingensis,endophytic fungus,secondary metabolites,ergosterimide B,demethylincisterol A5,cytotoxicities
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