Diterpene glycosides and phenolic compounds from the fruits of Xanthium strumarium

Abstract

Seven compounds including two diterpene glucosides atractyloside (1), carboxyatractyloside (2), and five phenolic compounds as 5-O-caffeoylquinic acid (3), 1,5-di-O-caffeoylquinic acid (4), 2,3-dihydroxy-1-(4(hydroxy-3-methoxyphenyl)-propan-1-one (5), (erythro)-1,2-bis(4-hydroxy-3-methoxyphenyl)-1,3-propandiol (6), and p- hydroxybenzaldehyde (7) were isolated from the fruits of Xanthium stumarium. Their chemical structures were determined using ES1-MS, 1D NMR, and 2D NMR spectra as well as by comparison of the spectral data with those reported in the literature. Compounds 4 and 5 were reported from Xanthium genus for the first time. To our best knowledge, all these compounds were firstly reported from X. strumarium growing in Vietnam.