Cytotoxic Meroterpenoids from the Fungus Alternaria sp. JJY‐32

Two new meroterpenoids, tricycloalternarenes X and Y, together with one known meroterpenoid, tricycloalternarene I, were isolated from the fungus Alternaria sp. JJY‐32. The structures including absolute configurations were established by the comprehensive spectroscopic data, electronic circular dichroism (ECD) spectral analyses, and biosynthesis consideration. Tricycloalternarene X showed cytotoxicity against the HL‐60 and HO8910 cells with IC50 values of 7.54 and 20.32 μm.

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