Sesquiterpene Lactones of Ambrosia artemisiifolia L. and Ambrosia trifida L. Species

Abstract

In addition to the already described peruvin ( I ), two further lactones, 3α-hydroxy-11α H ,13-dihydrodamsin ( II ) and, 3α-acetoxy-11α H ,13-dihydrodamsin ( III ), were isolated from aerial parts of species Ambrosia artemisiifolia L. The full structure of these lactones was derived from their NMR and CD spectra and the X-ray structural analysis of compound III . In the aerial part of Ambrosia trifida L. species coronopilin ( V ) and ivoxanthin ( VI ) were also identified.