Meroterpenoids from the fungus ganoderma sinensis and first absolute configuration clarification of Zizhine H

Abstract

Five new meroterpenoids, zizhines P-S and U (1-4,7), together with two known meroterpenoids (5 and 6) were isolated from Ganoderma sinensis. Their structures including absolute configurations were assigned by using spectroscopic, computational, and chemical methods. Racemics zizhines P and Q were purified by HPLC on chiral phase. Biological evaluation found that 4, 5 and 6 are cytotoxic toward human cancer cells (A549, BGC-823, Kyse30) with IC50 values in the range of 63.43-80.83 μMtowards A549, 59.2 ± 2.73 μMand 64.25 ± 0.37 μMtowards BGC-823, 76.28 ± 1.93 μM and 85.42 ± 2.82 μM towards Kyse30.