A new diterpenoid, azorellanol (5), was isolated from the whole plant of Az
orella compacta (Umbelliferae). The structure was established by using main
ly one- and two-dimensional NMR techniques, whereas the absolute stereochem
istry was determined by X-ray diffraction analysis. The diterpenoid (5) pos
sesses a novel hydrocarbon skeleton for which we suggest the name azorellan
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