Abstract
Seven new guanacastane-type diterpenoids, namely dahlianes E-K (1–7), and three known ones (8–10) were isolated from the cultures of the fungus Verticillium dahliae. Their structures were established by extensive spectroscopic data analysis along with Rh2(OCOCF3)4- and Mo2(OAc)4-induced electronic circular dichroism (ECD) experiment. Dahliane G showed an 80-fold potentiation effect on the sensitization of doxorubicin at the concentration of 15 μM when screening the reversal activity on doxorubicin-resistant human breast cancer cells (MCF-7/DOX).
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