Pteropyrum scoparium Jaub. & Spach (Polygonaceae) is a naturally growing shrub used as food crop in Oman. The chemical investigation of the ethyl acetate extracts of the leaf afforded phenylethanoid, benzofuranylethanoid and ethyl esters of caproic and lauric acids (1–3), proanthocyanidin trimer epicatechin-3-O-gallate-(4 → 8)-epicatechin-3-O-gallate-(4 → 8)-epicatechin-3-O-gallate (4) and epicatechin-3-O-gallate (5). Compounds 1 and 3 are new and isolated for the first time from P. scoparium. The structures of compounds were assigned based on 1D and 2D NMR spectroscopy and ESI–MS analysis. Compounds 1 and 3 were tested for free radical scavenging anti-oxidant properties and found to inhibit 2,2′-diphenyl-1-picrylhydrazyl radical (DPPH[rad]) by 1.7% and 41.0%, respectively compared to 71% and 78% for gallic acid and butylated hydroxyanisole used as control.
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