Pluviatolide is a lignan that has been found in B. chinense and has diverse biological activities, including antioxidant, enzyme inhibitory, and antispasmodic properties. It scavenges ABTS and 2,2-diphenyl-1-picrylhydrazyl (DPPH; ) radicals in cell-free assays (IC50s = 23.2 and 88.5 μM, respectively). Pluviatolide inhibits matrix metalloproteinase-7 (MMP-7) with an IC50 value of 260 μM. It decreases contractions induced by acetylcholine in isolated guinea pig ileum when used at concentrations of 30 and 100 μM.
