Abstract
Two new xanthones, 4,5-dihydroxy-3-(2-hydroxyethyl)-1-methoxy-8-methoxycarbonylxanthone (1) and 1,8-dihydroxy-4-(2-hydroxyethyl)-3-methoxyxanthone (2), and seven known xanthones (3–9) were isolated from the fermentation products of a Phomopsis species fungus. Compounds 1, 2, and 7 were tested for their cytotoxicity against five human tumor cell lines. Compound 1 showed cytotoxicity against A549 and PC3 cells with IC50 values of 2.6 and 2.4 μM, respectively. The other compounds also showed moderate cytotoxicity for some tested cell lines with IC50 values between 5.2–9.2 μM.
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