Dimeric Prenylated C<sub>6</sub>–C<sub>3</sub> Compounds from the Stem Bark of <i>Illicium oligandrum</i>

Three new dimeric prenylated C<sub>6</sub>–C<sub>3</sub> compounds, namely, illicidiones A (<b>1</b>), B (<b>2</b>), and C (<b>3</b>), were isolated from the stem bark of <i>Illicium oligandrum</i>. The structure and absolute configuration of these compounds were determined by extensive spectroscopic and chemical analyses, including NMR, modified Mosher method, and single-crystal X-ray study. Compounds <b>1</b>–<b>3</b> exhibited weak anti-inflammatory activities.