Helianol (3,4‐seco‐19(10 → 9)abeo‐8α,9β,10α‐ eupha‐4,24‐dien‐3‐ol), a Novel Triterpene Alcohol from the Tabular Flowers of Helianthus annuus L.

A novel 3, 4-seco-triterpene alcohol with a migrated euphane-type skeleton, called helianol, was isolated together with seven known triterpene alcohols from the nonsaponifiable lipid of the tabular flower extract of Helianthus annus L. The structure was determined by extensive spectroscopic analyses.