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A picrotoxane-type sesquiterpene, dendroterpene E ( 1 ), together with five benzene derivatives ( 2–6 ), were isolated from the stems of  Dendrobium nobile  Lindl. Their structures were elucidated by spectroscopic analysis and X-ray diffraction analysis. Compound  1  was a new picrotoxane-type sesquiterpene with a C-9/C-1/O/C-11 oxetane ring, which was first encountered in this type of compounds. Compounds  1–3  exhibited inhibitory activities against  α -glycosidase.

A new picrotoxane-type sesquiterpene from Dendrobium nobile Lindl