Journal of Natural Products
Antitumor agents 37. The isolation and structural elucidation of isohelenol, a new antileukemic sesquiterpene lactone, and isohelenalin from Helenium microcephalum.
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The known compound isohelenalin (1) was isolated from Helenium microcephalum and the previously reported structure confirmed on the basis of physicochemical data and chemical transformation. In addition, a new antileukemic sesquiterpene lactone, isohelenol (2), was isolated and its structure elucidated.