Peroxyferolide: a cytotoxic germacranolide hydroperoxide from Liriodendron tulipifera

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Abstract
An allyl hydroperoxy sesquiterpene lactone, peroxyferolide (2), from the leaves of L. tulipifera was characterized by spectral and chemical methods and prepared from lipiferolide (1) by photosensitized oxygenation.