Bazzania tridens

Tridensenone (40), whose structure assignment was based on spectral data, is the major component of Bazzania tridens 334). Myliol (44), a tetracyclic sesquiterpene alcohol, was isolated from Mylia taylorii 83, 88, 89) the structure proposal was based on careful analysis of the H-NMR and C-NMR spectra 6, 83, 88, 89). Because UV absorptions at 220 nm (log s, 3.70) and 275 280 nm (2.43 — 2.44) in (44) were difficult to reconcile with the proposed structure, structure (44) was established by X-ray crystallographic analysis of the />-bromobenzoate (82) 239, 275). 

---