Abstract
One new naphthalenone, didymelol A, and three new naphthols, didymelol B-D, together with three known naphthalenones, (3S,4R)-3,4,6-trihydroxy-3,4-dihydronaphthalen-1(2H)-one, (4S)-4,6-dihydroxy-3,4-dihydronaphthalen-1(2H)-one, (4S)-4-hydroxy-3,4-dihydronaphthalen-1(2H)-one, were isolated from the Saussurea laniceps endophytic fungus Didymella glomerata X223. The structures of the isolates were elucidated based on extensive spectroscopic data analysis. The absolute configuration of didymelol A was established through single-crystal X-ray diffraction data and didymelols B-D were identified through comparisons of experimental and calculated ECD spectra. All compounds were evaluated for cytotoxic activity against human non-small cell lung cancer A549 cells and human breast carcinoma MDA-MB-435 cells.
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