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Spirovibsanin A, isolated from Viburnum awabuki, has been demonstrated to be an unprecedented vibsane-type 18-norditerpene consisting of a unique bicyclo[3.3.1] nonanespiro-γ-lactone framework by a combination of 2D NMR data and conformational analysis using MacroModel.
Merrilactone A, isolated from the pericarps of Illicium merrillianum, shows an intriguing neurotrophic activity in the cultures of fetal rat cortical neurons. Its structure has been elucidated to be a unique sesquiterpene bearing two γ-lactones and an oxetane ring by extensive analyses of spectral data and then confirmed by X-ray crystallographic analysis. Further, the absolute configuration has been...
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