Petchienes A-E (1-5), five new meroterpenoids, were isolated from the fruiting bodies of Ganoderma petchii. Their structures, including absolute configurations, were elucidated by means of spectroscopic and computational methods. Compound 4 was isolated as a racemic mixture, which was finally purified by chiral HPLC to yield individual (-) and (+)-antipodes. Biological evaluation showed that compounds 2 and (-)-4 could increase intracellular free calcium concentration at 10 μM in HEK-293 cells.
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