The methanolic flower extract of Parthenium hysterophorus has been found to have antitumor effects in host mice bearing transplantable lymphocytic leukemia. The effect was more pronounced in terms of tumor size, tumor spread, and survival of the host. The potentiating effect of the extract was
Chemical examination of the flowers of Parthenium hysterophorus has resulted in the isolation of four acetylated pseudoguaianolides along with several known constituents. The structures of the compounds were derived from detailed studies of their spectral (1D and 2D NMR and FABMS) data and by