Two new dimers of ambuic acid, pestaloversicoloric acids A () and B (), and a known derivative, 13()-hydroxyambuic acid (), were isolated from the static fermentation product of . The structural identification was accomplished via analyses on the data of HR-MS, 1 D and 2 D NMR, and ECD. Different from the well-known -type dimer, torreyanic acid, compounds and represent the first example of -type product derived from the intermolecular Diels-Alder reaction of two molecules of ambuic acid derivative with the identical absolute stereochemistry.
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