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A new guaiane-type sesquiterpene, 4α,7β-dihydroxy-10βH-guai-5-en-1β,8β-endoxide (1), was isolated from Heteropappus altaicus (Compositea). The structure of compound 1, which contains exhibited a rare 1,8-oxide bridge, was established on the basis of spectroscopic data.

A New Sesquiterpene with a Novel 1β, 8β-Oxygen Bridge from Heteropappus altaicus (willd.) Novopokr.