A lignan with diverse biological activities; inhibits peroxidation of a linoleic acid emulsion by 64.2% at 20 μg/ml, scavenges hydrogen peroxide and DPPH, ABTS, and superoxide anion free radicals, and has ferrous ion metal chelating activity in cell-free assays; inhibits increases in serum levels of inorganic phosphate, IL-6, and TNF-α and decreases in serum calcium levels and transverse diameter, weight, bone mineral content, and bone mineral density of the right femur in a rat model of osteoporosis induced by dexamethasone at 10, 20, and 40 mg/kg