Chemical investigation of the marine-derived fungal isolate Penicillium sp. SF-5497 resulted in the isolation of two new preaustinoid-related meroterpenoids, named preaustinoid A6 (1) and preaustinoid A7 (2), along with three known metabolites (3–5). Their structures were elucidated by extensive spectroscopic analyses, such as 1D and 2D NMR and MS data. Among these, compounds 1 and 3 inhibited PTP1B activity in a dose-dependent manner, with IC50 values of 17.6 and 58.4 µM, respectively. Furthermore, kinetic analyses indicated that compound 1 inhibited PTP1B in a noncompetitive manner, with the Ki value of 17.0 µM.
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This research was supported by Wonkwang University in 2018.