Meroterpenoids With Protein Tyrosine Phosphatase 1B Inhibitory Activities From the Fruiting Bodies of Ganoderma ahmadii

fungi have long been used as functional foods and traditional medicines in Asian countries. is one of the main species of fungi distributed in Hainan province of China, the fruiting bodies of which have been used in folk to lower blood sugar for a long time. A chemical investigation of the fruiting bodies of led to the isolation of seven new meroterpenoids, named ganoduriporols F-L . The chemical structures of the compounds were elucidated by spectroscopic data including HRESIMS and 2D NMR. Compounds represent the first examples of ganoduriporol-type meroterpenoids bearing oxepane rings in their skeletons. Compounds showed inhibitory activity against protein tyrosine phosphatase 1B (PTP1B) comparable to the positive control Na VO , with IC values of 17, 20, 19, and 23 μM, respectively.