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Twonew heterodimeric sesquiterpenes, sterhirsutins A (1)and B (2), and two new sesquiterpenes, hirsutic acidsD–E (3and 4), were identified fromthe culture of Stereum hirsutum. The absolute configurationsin 1and 2were confirmed by single-crystalX-ray diffraction experiments and electronic circular dichroism (ECD)calculations. Compounds 1and 2are likelybiosynthesized from a hirsutane-type sesquiterpene and α-humuleneby a hetero-Diels–Alder cycloaddition. Compounds 1–4showed cytotoxicity against K562 and HCT116cell lines. [ABSTRACT FROM AUTHOR]

Coicenals A–C (1–3) possessing a previously undescribed 10-(sec-butyl)-6-hydroxy-1,7,9-trimethyl-1,6,7,8,9,9a-hexahydro-1,4-methanobenzo[d]oxepin-2(4H)-ylidene)acetaldehyde skeleton and coicenal D (4) with a new 2-(sec-butyl)-5-hydroxy-1,6,8-trimethyl-2,5,6,7,8,8a-hexahydro-1H-4a,1-(epoxymethano)naphthalen-10-ylidene)acetaldehyde skeleton were isolated from the solid culture of the plant pathogenic fungus Bipolaris coicis. The absolute configurations in 1and 4were assigned by electronic circular dichroism (ECD) calculations. Compounds 1and 2were transformed into 4and 5by treatment with acetyl chloride, respectively. Compounds 1–4showed moderate inhibitory activity against NO release with IC50values of 16.34 ± 1.12, 23.55 ± 1.37, 10.82 ± 0.83, and 54.20 ± 2.82 μM, respectively. [ABSTRACT FROM AUTHOR]

Eryngiolide A (1), the first member of C20 diterpenoids with the skeleton deriving from a cyclododecane core fused with two γ-lactone units, was isolated from the solid culture of the edible mushroom Pleurotus eryngii. The structure of 1was elucidated by extensive analysis of NMR spectra. Compound 1exhibited moderate cytotoxicity against two human cancer lines in vitro. [ABSTRACT FROM AUTHOR]