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Structure and absolute configuration assignments of ochracines F–L, chamigrane and cadinane sesquiterpenes from the basidiomycete Steccherinum ochraceum HFG119†
Zhen-Zhu Zhao,Qi-Lu Zhao,Wei-Sheng Feng,Hai-Rong He,Meng Li,Gui-Min Xue,He-Ping Chen,Ji-Kai Liu
RSC Advances Pub Date : 05/24/2021 00:00:00 , DOI:10.1039/D1RA03320D
Abstract

Ochracines F–L (1–7), seven previously undescribed chamigrane and cadinane sesquiterpenoids, together with four known chamigranes were isolated from cultures of the wood-decaying fungus Steccherinum ochraceum HFG119. Ochracines F–L were structurally characterized by extensive analysis of HRMS and NMR spectroscopic data. The relative configurations were assigned through a combination of NOE correlations and J-based configuration analysis (JBCA), while the absolute configurations were determined by X-ray single-crystal diffraction, and calculated methods (ECD, [α], 13C NMR). All the new isolates were evaluated for their cytotoxicity against five human cancer cell lines HL-60, SMMC-7721, A549, MCF-7, and SW-480, and inhibitory activity on NO production in RAW 264.7 macrophages.

Graphical abstract: Structure and absolute configuration assignments of ochracines F–L, chamigrane and cadinane sesquiterpenes from the basidiomycete Steccherinum ochraceum HFG119
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