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Divirensols: Sesquiterpene Dimers from the Australian Termite Nest-Derived Fungus Trichoderma virens CMB-TN16
Wei-Hua Jiao1,2, Pradeep Dewapriya1, Osama Mohamed1
1Division of Chemistry and Structural Biology, Institute for Molecular Bioscience , The University of Queensland , St Lucia , QLD 4072 , Australia.
Abstract:
A chemical investigation of the Australian termite nest-derived fungus Trichoderma virens CMB-TN16 yielded the known sesquiterpene gliocladic acid (1), together with two new acetylated analogues, 3-acetylgliocladic acid (2) and 14-acetylgliocladic acid (3), and seven new dimeric congeners, divirensols A-G (4-10). All metabolites were identified by detailed spectroscopic analysis, supported by biosynthetic considerations, and were assessed for antibacterial and cytotoxic properties. The divirensols are examples of an exceptionally rare class of dimeric sesquiterpene, likely linked via a highly convergent biosynthetic pathway. HPLC-DAD-MS analysis of the crude fungal extract detected ions attributed to putative monomeric biosynthetic precursors.
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