New butenolides with anti-inflammatory activity from <i>Balanophora fungosa</i> ZhouJie DuSi-Yu FangZhong-Ying ZengZhi 2019 <p>Two new butenolides, balanolides A (<b>1</b>) and B (<b>1</b>), were isolated from the aerial parts of the parasitic plant <i>Balanophora fungosa</i>. Their structures were established by comprehensive spectroscopic analysis and quantum chemical ECD calculation. The new butenolides were evaluated for their inhibitory effects against nitric oxide (NO) production in LPS-induced RAW 264.7 macrophage cells. Compounds <b>1</b> and <b>2</b> displayed moderate anti-inflammatory activity with IC<sub>50</sub>values of 11.8 and 12.9 μM, respectively.</p>