A new schistosomicidal and antioxidative phenylpropanoid from Astragalus englerianus.

A new phenylpropanoid, (E)-2,3,4-trimethoxy-5-(1-propenyl)phenol (1), along with five known aromatic compounds (2-6), was isolated from the methanol extract of roots of Astragalus englerianus. Their structures were elucidated based on the analyses of extensive spectroscopic data and comparison of their physicochemical properties. Compounds 1 and 2 were evaluated schistosomicidal activities, and all the isolated compounds were tested for their antioxidant activities in vitro. Compound 1 showed significant schistosomicidal activity with worm mortality rates of 66.7% and 83.3% within 12 and 24 h in a drug-containing (1.16 mM) RPMI 1640 medium, respectively. Also, compound 1 exhibited excellent antioxidant activity (2,2-diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl free radical-scavenging capability) with an IC50 value of 81.3 ± 1.3 μM.