Two new pseudoguaianolides from the flowers of Parthenium hysterophorus

摘要

Chemical investigation on two samples of the flowers of Parthenium hysterophorus afforded two new pseudoguaianolides (one from each sample) together with several known constituents. The structures of the new compounds were established by extensive spectroscopic (1D- and 2D-NMR) studies. The X-ray crystallographic analysis of one of these compounds was also accomplished.